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• KVM/Libvirt bridged/routed networking not working on newer guest kernels

  - by SharkWipf

  I have a dedicated server running Debian 6, with Libvirt (0.9.11.3) and Qemu-KVM (qemu-kvm-1.0+dfsg-11, Debian). I am having a problem getting bridged/routed networking to work in KVM guests with newer kernels (2.6.38). NATted networking works fine though. Older kernels work perfectly fine as well. The host kernel is at version 3.2.0-2-amd64, the problem was also there on an older host kernel. The contents of the host's /etc/network/interfaces (ip removed): # Loopback device: auto lo iface lo inet loopback # bridge auto br0 iface br0 inet static address 176.9.xx.xx broadcast 176.9.xx.xx netmask 255.255.255.224 gateway 176.9.xx.xx pointopoint 176.9.xx.xx bridge_ports eth0 bridge_stp off bridge_maxwait 0 bridge_fd 0 up route add -host 176.9.xx.xx dev br0 # VM IP post-up mii-tool -F 100baseTx-FD br0 # default route to access subnet up route add -net 176.9.xx.xx netmask 255.255.255.224 gw 176.9.xx.xx br0 The output of ifconfig -a on the host: br0 Link encap:Ethernet HWaddr 54:04:a6:8a:66:13 inet addr:176.9.xx.xx Bcast:176.9.xx.xx Mask:255.255.255.224 inet6 addr: fe80::5604:a6ff:fe8a:6613/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:20216729 errors:0 dropped:0 overruns:0 frame:0 TX packets:19962220 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:14144528601 (13.1 GiB) TX bytes:7990702656 (7.4 GiB) eth0 Link encap:Ethernet HWaddr 54:04:a6:8a:66:13 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:26991788 errors:0 dropped:12066 overruns:0 frame:0 TX packets:19737261 errors:270082 dropped:0 overruns:0 carrier:270082 collisions:1686317 txqueuelen:1000 RX bytes:15459970915 (14.3 GiB) TX bytes:6661808415 (6.2 GiB) Interrupt:17 Memory:fe500000-fe520000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:6240133 errors:0 dropped:0 overruns:0 frame:0 TX packets:6240133 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:6081956230 (5.6 GiB) TX bytes:6081956230 (5.6 GiB) virbr0 Link encap:Ethernet HWaddr 52:54:00:79:e4:5a inet addr:192.168.100.1 Bcast:192.168.100.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:225016 errors:0 dropped:0 overruns:0 frame:0 TX packets:412958 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:16284276 (15.5 MiB) TX bytes:687827984 (655.9 MiB) virbr0-nic Link encap:Ethernet HWaddr 52:54:00:79:e4:5a BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vnet0 Link encap:Ethernet HWaddr fe:54:00:93:4e:68 inet6 addr: fe80::fc54:ff:fe93:4e68/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:607670 errors:0 dropped:0 overruns:0 frame:0 TX packets:5932089 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:83574773 (79.7 MiB) TX bytes:1092482370 (1.0 GiB) vnet1 Link encap:Ethernet HWaddr fe:54:00:ed:6a:43 inet6 addr: fe80::fc54:ff:feed:6a43/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:922132 errors:0 dropped:0 overruns:0 frame:0 TX packets:6342375 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:251091242 (239.4 MiB) TX bytes:1629079567 (1.5 GiB) vnet2 Link encap:Ethernet HWaddr fe:54:00:0d:cb:3d inet6 addr: fe80::fc54:ff:fe0d:cb3d/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:9461 errors:0 dropped:0 overruns:0 frame:0 TX packets:665189 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:4990275 (4.7 MiB) TX bytes:49229647 (46.9 MiB) vnet3 Link encap:Ethernet HWaddr fe:54:cd:83:eb:aa inet6 addr: fe80::fc54:cdff:fe83:ebaa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1649 errors:0 dropped:0 overruns:0 frame:0 TX packets:12177 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:77233 (75.4 KiB) TX bytes:2127934 (2.0 MiB) The guest's /etc/network/interfaces, in this case running Ubuntu 12.04 (ip removed): # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 176.9.xx.xx netmask 255.255.255.248 gateway 176.9.xx.xx # Host IP pointopoint 176.9.xx.xx # Host IP dns-nameservers 8.8.8.8 8.8.4.4 The output of ifconfig -a on the guest: eth0 Link encap:Ethernet HWaddr 52:54:cd:83:eb:aa inet addr:176.9.xx.xx Bcast:0.0.0.0 Mask:255.255.255.255 inet6 addr: fe80::5054:cdff:fe83:ebaa/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:14190 errors:0 dropped:0 overruns:0 frame:0 TX packets:1768 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2614642 (2.6 MB) TX bytes:82700 (82.7 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:954 errors:0 dropped:0 overruns:0 frame:0 TX packets:954 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:176679 (176.6 KB) TX bytes:176679 (176.6 KB) Output of ping -c4 on the guest: PING google.nl (173.194.35.151) 56(84) bytes of data. 64 bytes from muc03s01-in-f23.1e100.net (173.194.35.151): icmp_req=1 ttl=55 time=14.7 ms From static.174.82.xx.xx.clients.your-server.de (176.9.xx.xx): icmp_seq=2 Redirect Host(New nexthop: static.161.82.9.176.clients.your-server.de (176.9.82.161)) 64 bytes from muc03s01-in-f23.1e100.net (173.194.35.151): icmp_req=2 ttl=55 time=15.1 ms From static.198.170.9.176.clients.your-server.de (176.9.170.198) icmp_seq=3 Destination Host Unreachable From static.198.170.9.176.clients.your-server.de (176.9.170.198) icmp_seq=4 Destination Host Unreachable --- google.nl ping statistics --- 4 packets transmitted, 2 received, +2 errors, 50% packet loss, time 3002ms rtt min/avg/max/mdev = 14.797/14.983/15.170/0.223 ms, pipe 2 The static.174.82.xx.xx.clients.your-server.de (176.9.xx.xx) is the host's IP. I have encountered this problem with every guest OS I've tried, that being Fedora, Ubuntu (server/desktop) and Debian with an upgraded kernel. I've also tried compiling the guest kernel myself, to no avail. I have no problem with recompiling a kernel, though the host cannot afford any downtime. Any ideas on this problem are very welcome. EDIT: I can ping the host from inside the guest.

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• voice transmission using Wi-Fi in Ad hoc networking mode

  - by iam0hot

  We are looking to create Inter Vehicle communication system. So, a couple of vehicles should get connected automatically and could be able to share voice.. We decided to implement ad-hoc networking using Wi-Fi.. we are expecting it to cover a radius of 100 mts. If we could create a system like this.. and one of the user sends a voice information, does all people in the network get that ? What are the things we require to get this project done ?

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• What's the point of Netgear's WNHDB3004 "3DHD WIRELESS HOME THEATER NETWORKING KIT"

  - by badp

  Here's a crude representation of what I've got at home: floor 2 INTERNETS ---- MODEM/ROUTER ---- MY COMPUTER | floor 1 WIFI REPEATER ---- stuff | floor 0 more stuff TELEVISION Now, as part of our sat tv subscription we can get an additional service if we connect our decoder (located by TELEVISION obviously) to the internet. What they suggest is buying a Netgear 3DHD WIRELESS HOME THEATER NETWORKING KIT holy shit isn't my bullshit-o-meter flying high right now from the general buzzwordyness of this thing. What does this thing actually do that our existing wireless-enabled routers don't do? What's the point of having a third wifi router in the same house, this time only for one television? If I do decide to plunge €99 for this, should I connect it to the wifi repeater (which does not provide AAA quality internet, at least for all gaming purposes) or to my modem/router (risking issues with low signal?).

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• VirtualBox networking problem, host XP, guest Debian

  - by Silma

  Hi, I'm trying to set up a development environment in a virtual machine on my laptop, with debian os. I have both lan and wlan available on the host machine, yet I can't connect to the internet using either. As I said the host OS is windows XP and the guest OS will be the latest Debian, we downloaded the business card net install so we need internet access from the beginning, besides we need the virtual machine to be visible on the local network (for my fellow developers). We tried host-only networking, NAT, bridging, with proxy (the local network uses a proxy to connect to the internet) and without proxy, nothing seems to work. What else can we do? Thanks a lot.

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• Running bridged-networking vmware player on a Linux machine with 2 interfaces

  - by Roman D

  I have got a laptop running Arch Linux with 2 interfaces: wireless (wlan0) and ethernet (eth0). I use wlan0 to access internet (static IP, networking is configured using netcfg), and I connect a second PC to the eth0. Now, whenever I start vmware player (v. 4.0.4), it chooses wlan0 to connect its bridged virtual NIC to, but I need it to connect to eth0 (I want my guest machine to be able to talk to the second physical PC on eth0). So, I disable the wlan0 interface (netcfg -d wireless) and restart vmware. Now, it connects to eth0, and everything works fine; I can ping the host PC from the virtual one, and I can ping the virtual PC from the second physical PC connected to eth0. Then, if I try to reenable the wlan0 interface (netcfg -u wireless), all of the connectivity between the host and the guest (and between the second physical PC and the guest) gets lost, until I disable wlan0 again. Can someone please give me a hint on what's going on?

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• How to recover basic networking utilities on Debian?

  - by Rizo

  I am administrating a small server for LAN, providing basic services such as web-proxy, ldap, kerberos, afs, etc. Yesterday there was a power cut so server halted. When I restarted it no network interfaces were available and configured. I tried restarting networking daemon but it just exited with 0 status. So I tried to run one of the interfaces manually, but ifup and ifdown commands simply are not there. No only in PATH, but they disappeared from /sbin. So my question is: how can I recover these network utilities?

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• How to Enable old networking protocols in Windows 7

  - by Will

  Hi, A few days ago I installed Win7 32bit on a PC and it wouldn't talk to my Lacie NAS which is running WinXP embedded. My other Win7 PC's had no problem. After a bit of searching I found a forum post that told me to enable older networking protocols on the Win7 PC, I think it was win98 protocols or something like that. I had to run a .msc program to do this. It fixed the problem. Now, I have a similar problem on another Win7 PC and for the life of me cannot find that posting and cannot remember what I did! Does anyone know the program or setting to do this? Thanks, Will.

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• Can't get bridged networking to work between linux guest virtual machine and Mac host

  - by tgoneil

  I'm trying to establish bridged networking from linux mint vsn 12 in virtualbox to a Mac Lion host. Mac config: Network setting: en3 configured by DHCP Sharing setting: Internet Sharing selected, Share connection from en3 to computers using en3 Virtualbox Linux setting: Network setting: Bridged Adapter, Name: en3 I can ping from host (192.168.2.1) to guest (192.168.2.2) and guest to host, but I Cannot ping from the Linux guest to the outside world. Connection in host is up, because I can ping from the Mac host to the outside world. Something else that's seems weird to me, in the Mac Network setting, the IP Address generated by DHCP says 169.254.243.185. What the heck is that?? When I open a terminal up in the Mac, however, ifconfig shows its en3 inet address as 192.168.2.1.

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• Social-Networking Startup, Hosting Plan

  - by pws5068

  I've created a social networking community which is soon ready to release, and I'm trying to decide on a type of hosting plan. I have considered options such as VPS and Reseller plans. I anticipate (or hope for at least) a significant amount of traffic/bandwidth in the not-too-distant future. If I open a reseller, will I receive the same amount of server lag during busy hours that I do with a shared account? How significant is the profit margin with the reseller option? Aside from generalized "configurability", what advantages merit purchasing a VPS? Is there anything stopping me from reselling space on a VPS account? Features I need Include: PHP, MySql, Unlimited Domains, Ruby on Rails, Remote Database Connections

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• How does bridged networking work?

  - by agz

  How does bridged networking work? I have looked through the virtualbox manuals but nothing extremely technical came up (It was just a generic gloss over of the topic) How does it assign a different ip to the virtual machine but uses the same network card? Why does this different ip (I found using ip addr under linux) not show up under the "attached devices section" of my router but I can port forward to it? How come if I connect to a password protected wifi network, it does not require me to enter my password? Is this multihoming?

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• Configuring VirtualBox host only networking: OSX host, Ubuntu guest

  - by Greg K

  I have a Ubuntu guest configured with two interfaces, eth0 is using NAT and works fine, I can access the net. The second interface eth1 is set to host only networking and VirtualBox has created a vboxnet0 virtual adapter on the host. I've configured vboxnet0 in VirtualBox adapter settings with the following: ip 192.168.21.20 subnet 255.255.255.0 Once the VM guest is running, ifconfig on OSX has vboxnet0 setup as: vboxnet0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 0a:00:27:00:00:00 inet 192.168.21.20 netmask 0xffffff00 broadcast 192.168.21.255 In the guest, eth0 is set to use DHCP, I've statically assigned eth1 to 192.168.21.20 (is this a mistake?): auto eth1 iface eth1 inet static address 192.168.21.20 netmask 255.255.255.0 network 192.168.21.0 broadcast 192.168.21.255 gateway 192.168.21.1 There is no device on 192.168.21.1 - what should I set my gateway to? In the guest the routes look like so: Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.21.0 * 255.255.255.0 U 0 0 0 eth1 10.0.2.0 * 255.255.255.0 U 0 0 0 eth0 default 10.0.2.2 0.0.0.0 UG 100 0 0 eth0 default 192.168.21.1 0.0.0.0 UG 100 0 0 eth1 Route table on OSX: $ netstat -nr Routing tables Internet: Destination Gateway Flags Refs Use Netif Expire default 10.77.36.1 UGSc 28 0 en1 10.77.36/22 link#5 UCS 5 0 en1 10.77.39.38 127.0.0.1 UHS 1 2236 lo0 10.77.39.255 link#5 UHLWbI 1 66 en1 127 127.0.0.1 UCS 0 0 lo0 127.0.0.1 127.0.0.1 UH 1 8642 lo0 169.254 link#5 UCS 0 0 en1 192.168.21 link#7 UC 2 0 vboxnet 192.168.21.20 a:0:27:0:0:0 UHLWI 0 4 lo0 192.168.21.255 link#7 UHLWbI 2 64 vboxnet I can't SSH from the host to the guest (I used to be able to when the VM was configured with a bridged connection): $ ssh 192.168.21.20 ssh: connect to host 192.168.21.20 port 22: Connection refused What have I done wrong here? TIA

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• Prevent Cisco VPN from interrupting home networking

  - by jkohlhepp

  I just got a new laptop, and for the most part have left its settings alone. Today I was trying to get some sharing going between my desktop and the laptop. Both machines are connected to the same wireless network and both machines consider that network to be a Home network. Both are running Win7 Home Premium. It seems like my laptop is aware of my desktop on the network. It can ping it by IP or by computer name. When I go to Network from the laptop, I can see the desktop in the list of computers. However, my desktop cannot ping the laptop, nor can it see it within Network. My desktop has a Homegroup set up, but my laptop says "There is currently no homegroup on the network". I do have network discovery turned on for both machines. Why can my desktop not "talk" to my laptop but it works the other way around? Update: Disabling the Windows Firewall on the laptop somewhat fixes the problem. With it disabled, my desktop can ping my laptop, but still my laptop can't see the homegroup. Also, it can ping via hostname, which resolves to IPv6, but can't ping via the IPv4 address. Obviously I'd rather not leave my firewall disabled, so I need a more specific fix. Update 2: Aha! It is the Cisco VPN software I was running to connect to work computers. Once I disconnected and exited from that, the two PCs seemed to be talking normally and the homegroup was visible to the laptop. So now my question has morphed: how can I prevent Cisco VPN from interrupting my home networking?

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• KVM Guest with NAT + Bridged networking

  - by Daniel

  I currently have a few KVM Guests on a dedicated server with bridged networking (this works) and i can successfully ping the outside ips i assign via ifconfig (in the guest). However, due to the fact i only have 5 public ipv4 ip addresses, i would like to port forward services like so: hostip:port - kvm_guest:port UPDATE I found out KVM comes with a "default" NAT interface, so added the virtual NIC to the Guest virsh configuration then configured it in the Guest, it has the ip address: 192.168.122.112 I can successfully ping 192.168.122.112 and access all ports on 192.168.122.112 from the KVM Host, so i tried to port forward like so: iptables -t nat -I PREROUTING -p tcp --dport 5222 -j DNAT --to-destination 192.168.122.112:2521 iptables -I FORWARD -m state -d 192.168.122.0/24 --state NEW,RELATED,ESTABLISHED -j ACCEPT telnet KVM_HOST_IP 5222 just hangs on "trying" telnet 192.168.122.112 2521 works [root@node1 ~]# tcpdump port 5222 tcpdump: WARNING: eth0: no IPv4 address assigned tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes 23:43:47.216181 IP 1.152.245.247.51183 > null.xmpp-client: Flags [S], seq 1183303931, win 65535, options [mss 1400,nop,wscale 3,nop,nop,TS val 445777813 ecr 0,sackOK,eol], length 0 23:43:48.315747 IP 1.152.245.247.51183 > null.xmpp-client: Flags [S], seq 1183303931, win 65535, options [mss 1400,nop,wscale 3,nop,nop,TS val 445778912 ecr 0,sackOK,eol], length 0 23:43:49.415606 IP 1.152.245.247.51183 > null.xmpp-client: Flags [S], seq 1183303931, win 65535, options [mss 1400,nop,wscale 3,nop,nop,TS val 445780010 ecr 0,sackOK,eol], length 0 7 packets received by filter 0 packets dropped by kernel [root@node1 ~]# iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state NEW,RELATED,ESTABLISHED Chain OUTPUT (policy ACCEPT) target prot opt source destination All help is appreciated. Thanks.

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• Networking Problem MrxSmb event 50 "Delayed Write Failed" errors occurring all of the sudden

  - by Johnny Musso

  JUST THIS MONTH, we have started getting reports from a number of very stable clients that MrxSmb event id 50 errors keep appearing in their system event logs. Otherwise, they do not appear to have any networking problems except that there is a critical legacy application which seems to either be generating the MrxSmb errors or having errors occur because of them. The legacy application is comprised of 16 bit and 32 bit code and has not been changed or recompiled in many years. It has always been stable on Windows XP systems. The customers that have the problem usually have a small (5 clients or less) peer to peer network with all Windows XP systems. All service packs are loaded on the XP machines. Note: The only thing that seems to correct the problem is disabling opportunistic locking. I don't like this solution because it seems to slow down the network and sometimes causes record locking issues between users (on some networks). Also, this seems to have just started happening - as if a Windows update for XP has caused it? However, I have removed recent updates and it did not correct the issue. Thanks in advance for any help you can provide.

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• Hyper-V 2008 R2 synthetic networking stops working with linux 2.6.32.15

  - by luxifer

  Hi there, so I thought I'd give Hyper-V on Windows Server 2008 R2 Enterprise a try on my Homeserver (yes, it's legit... got it from msdnaa). First thing to throw at it was my firewall which runs IPFire. This distribution currently uses the kernel version 2.6.32.15 and comes with the Hyper-V drivers. So I enabled them and at first they work just fine but after a few minutes they just fail. There are no packages going in or out anymore until I reboot the VM but sometimes even that won't work so the VM just keeps "Stopping" like forever. Emulated networking works fine but it slow and uses more CPU. That way my firewall routes slower than when running under virtualbox on an atom N270. My server has an E6750; VM is limited to 25%, but that should still outperform this atom CPU especially since it's never going anywhere near 100% CPU load, so give me a break! A quick google search led me to people having the same problem (even with other distributions and kernel versions that include those drivers) but no solution yet... I already found this but I can't quite follow the author on the part where he solved the issue - especially since I need two virtual nics for my firewall distro to work (obviously one internal and one external) What am I missing here?

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• Networking - intermittent, slow speeds

  - by jack

  Hi all I'm a novice when it comes to networking. I live in a large two storey building that used to be a school and we have an internet connection with BT (british telecoms provider), the connection speed is 12Mb.. Basically our connection is slow and very intermittent and I was wondering if anybody here could provide some help or ideas. There are about 11 people in the building who could be online at any time. We have a router on the ground floor which is bog standard supplied by BT. To provide Broadband access to the 1st and 2nd floors, we used an old switch that the school left, we have a cable running from the router on the first floor to the switch which connects to a wireless router which is configured as a bridge on the 2nd floor supplying broadband access to the 1st and 2nd floors. Additionally we have 3 computers that are connected via the switch through the ethernet sockets left by the school on the ground floor. The router we use on the 2nd floor came in a pack of 2 and cost about £15 (bought by another person). Sometimes the connection is perfectly fine, i.e. early hours of the morning or when everybody is out, we have rang BT who say that the connection cannot cope with the numbers of people online, plus I'm not sure whether each person is streaming etc. Can anybody offer any advice?

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• CentOS networking BNX2

  - by james moore

  Having some trouble with my NICs. The server starts fine and I can wget/ping etc. However, when I /etc/init.d/networking restart I then receive the following error: Bringing up interface eth0: bnx2: fw sync timeout, reset code = 1030009 SIOCSIFFLAGS: Device or resource busy Consequently, the task fails. I have searched around on google users suggesting to disable PNP in the BIOS but I see no option. Here is some system information: $ ethtool -i eth0 driver: bnx2 version: 2.0.8-rh firmware-version: bc 2.9.1 $ uname -a Linux host 2.6.18-238.9.1.el5 #1 SMP Tue Apr 12 18:10:13 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux $/sbin/lspci | grep Broadcom 04:00.0 PCI brodge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3) 05:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5700 Gigabit Ethernet (rev 12) 08:00.0 PCI brodge: Broadcom EPB PCI-Express to PCI-X Bridge (rev c3) 09:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5700 Gigabit Ethernet (rev 12) $ lsmod | grep bnx2 bnx2i 81704 0 cnic 109512 1 bnx2i libiscsi2 77765 6 be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi_tcp scsi_transport_iscsi2 73945 8 be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi2 bnx2 224780 0 scsi_mod 199001 15 mpt2sas,scsi_transport_sas,mptctl,be2iscsi,ib_iser,iscsi_tcp,bnx2i,cxgb3i,libiscsi2,scsi_transport_iscsi2,scsi_dh,sg,libata,megaraid_sas,sd_mod $ rmmod bnx2; modprobe bnx2 PCI: Enabling device 0000:05:00.0 (0158 -> 015a) PCI: Enabling device 0000:09:00.0 (0158 -> 015a) bnx2: fw sync timeout, reset code = 10300003 Any help would be appreciated as I am at a loss.

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• Centos 6.2 Fresh 'Basic Server' install networking issues

  - by RWC

  I've had a /29 provisioned on a network port for a server and am trying to at least configure the machine so I can ssh into it. It's Centos 6.2 x64 with the Basic Server install. Currently not able to ping gateway or any address for that matter. For reference: Default Interface: em2 Network ID: 66.*.*.0/29 Gateway: 66.*.*.1 Broadcast: 66.*.*.7 Please see my following configs: /etc/sysconfig/network-scripts/ifcfg-em2 DEVICE=em2 NM_CONTROLLED=yes ONBOOT=yes HWADDR=Not Important TYPE=Ethernet BOOTPROTO=none IPADDR=66.*.*.2 PREFIX=29 DNS1=8.8.8.8 DNS2=8.8.4.4 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System em2" NETMASK=255.255.255.248 USERCTL=no $: route -n Destination // Gateway // Genmask // Flags // Metric // Ref // Use // Iface 66.*.*.0 0.0.0.0 255.255.255.248 U 0 0 0 em2 169.254.0.0 0.0.0.0 255.255.0.0 U 0 1003 0 em2 0.0.0.0 66.*.*.1 0.0.0.0 UG 0 0 0 em2 $: route Destination // Gateway // Genmask // Flags // Metric // Ref // Use // Iface 66.*.*.0 * 255.255.255.248 U 0 0 0 em2 link-local * 255.255.0.0 U 0 1003 0 em2 default 66.*.*.1 0.0.0.0 UG 0 0 0 em2 $: cat /etc/sysconfig/network NETWORKING=yes HOSTNAME=excalibur.domain.com GATEWAY=66.*.*.1 Keep in mind that I cannot even currently ping the gateway which is quite confusing for me. My /etc/hosts are configured correctly with the *.2 address. I'm not concerned with getting all of the addresses on the /29 up and running yet, just one so I can at least ssh in. Thanks! Edit: Adding in ifconfig. $: ifconfig em2 Link encap:Ethernet HWaddr XX:XX:XX:XX:XX:XX inet addr:66.*.*.2 Bcat:66.*.*.7 Mask:255.255.255.248 inet6 addr: UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5536 errors:0 dropped:0 overruns:0 frame:0 TX packets:10 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2599469 (2.4 MiB) TX bytes: 748 (748.0 b) Interrupt:48 Memory:dc000000-dc012800 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:34 errors:0 etc etc

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• Networking issues with Linux server (CentOS 5.3)

  - by sxanness

  I have a Linux server hosting our bug tracking software (CentOS 5.2 Kernel 2.6.18-128.4.1.el5) that I have having some strange network problems with. The machine is configured with two NICS, one for the public interface and the other for our server back end network. The problem is that after doing a service network restart I can ping the public interface and it sends anywhere from 200-500 ICMP packets and then all of a sudden I start getting a request timed out error. Strange but as soon as I connect to the private interface the ping starts working again to the public interface. I clearly have a routing issue somewhere. I have a Juniper Router with the following configuration. Interface 0/0 -- Connect subnet to the ISP at our co-location Interface 0/2 -- For our DRAC network Interface 0/3 -- The Server-backend network (plugs directly into a switch that feeds to all the NICs that are on the 10.3.20.x network. Interface 0/4 -- Plugs directly into another switch that feeds our public interfaces, that interface as all the gateways from our public ip rangs as secondary IP addresses. I hope that someone can ask the right questions that can lead me to check things and figure out what is going on. Has anyone had similar problems and what kind of things should I be checking? Routing issue or something even more complicated? [root@fogbugz ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ DEVICE=eth0 BOOTPROTO=static IPADDR=72.249.134.98 NETMASK=255.255.255.248 BROADCAST=72.249.134.103 HWADDR=00:16:3E:AA:BB:EE ONBOOT=yes [root@fogbugz ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1 # Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ DEVICE=eth1 BOOTPROTO=static BROADCAST=10.3.20.255 HWADDR=00:17:3E:AA:BB:EE IPADDR=10.3.20.25 NETMASK=255.255.255.0 NETWORK=10.3.20.0 ONBOOT=yes [root@fogbugz ~]# cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=fogbugz.dfw.hisg-it.net GATEWAY=72.249.134.97 [root@fogbugz ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 72.249.134.96 0.0.0.0 255.255.255.248 U 0 0 0 eth0 10.3.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 10.0.0.0 10.3.20.1 255.0.0.0 UG 0 0 0 eth1 0.0.0.0 72.249.134.97 0.0.0.0 UG 0 0 0 eth0

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• Networking issues with Linux server (CentOS 5.3)

  - by sxanness

  I have a Linux server hosting our bug tracking software (CentOS 5.2 Kernel 2.6.18-128.4.1.el5) that I have having some strange network problems with. The machine is configured with two NICS, one for the public interface and the other for our server back end network. The problem is that after doing a service network restart I can ping the public interface and it sends anywhere from 200-500 ICMP packets and then all of a sudden I start getting a request timed out error. Strange but as soon as I connect to the private interface the ping starts working again to the public interface. I clearly have a routing issue somewhere. I have a Juniper Router with the following configuration. Interface 0/0 -- Connect subnet to the ISP at our co-location Interface 0/2 -- For our DRAC network Interface 0/3 -- The Server-backend network (plugs directly into a switch that feeds to all the NICs that are on the 10.3.20.x network. Interface 0/4 -- Plugs directly into another switch that feeds our public interfaces, that interface as all the gateways from our public ip rangs as secondary IP addresses. I hope that someone can ask the right questions that can lead me to check things and figure out what is going on. Has anyone had similar problems and what kind of things should I be checking? Routing issue or something even more complicated? [root@fogbugz ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0 # Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ DEVICE=eth0 BOOTPROTO=static IPADDR=72.249.134.98 NETMASK=255.255.255.248 BROADCAST=72.249.134.103 HWADDR=00:16:3E:AA:BB:EE ONBOOT=yes [root@fogbugz ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth1 # Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ DEVICE=eth1 BOOTPROTO=static BROADCAST=10.3.20.255 HWADDR=00:17:3E:AA:BB:EE IPADDR=10.3.20.25 NETMASK=255.255.255.0 NETWORK=10.3.20.0 ONBOOT=yes [root@fogbugz ~]# cat /etc/sysconfig/network NETWORKING=yes NETWORKING_IPV6=no HOSTNAME=fogbugz.dfw.hisg-it.net GATEWAY=72.249.134.97 [root@fogbugz ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 72.249.134.96 0.0.0.0 255.255.255.248 U 0 0 0 eth0 10.3.20.0 0.0.0.0 255.255.255.0 U 0 0 0 eth1 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth1 10.0.0.0 10.3.20.1 255.0.0.0 UG 0 0 0 eth1 0.0.0.0 72.249.134.97 0.0.0.0 UG 0 0 0 eth0

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• Wireless disabled after connecting ethernet cable

  - by user1716672

  Im using Linux Mint 13. Wireless has always worked fine but stopped yesterday after I connected to the internet via an ethernet cable. I ran: sudo rfkill list gives me: 0: phy0: Wireless LAN Soft blocked: yes Hard blocked: no sudo rfkill unblock 0 sudo rfkill list gives me 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no sudo service networking start results in: networking stop/waiting The contents of /etc/network/interfaces is auto lo iface lo inet loopback Any ideas what I can do?

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• What resources do you recommend for learning more about TCP/IP, networking, and related areas?

  - by mkelley33

  As a relatively-new Python programmer, I'm finding more and more that networking as it relates to the web and web development is becoming increasingly important to understand. When I was an active C# ASP.NET programmer making smaller websites with less responsibility this knowledge seemed less important, since there was often a "networking" guy performing any tasks beyond acquiring a domain name for a client. Which books, websites, presentations, articles, or other resources would you recommend so that I best understand what's happening between the time a user types a URL and receives the rendered HTML? Thanks!

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• debian lenny xen bridge networking problem

  - by Sasha

  DomU isn't talking to the world, but it talks to Dom0. Here are the tests that I made: Dom0 (external networking is working): ping 188.40.96.238 #Which is Domu's ip PING 188.40.96.238 (188.40.96.238) 56(84) bytes of data. 64 bytes from 188.40.96.238: icmp_seq=1 ttl=64 time=0.092 ms DomU: ping 188.40.96.215 #Which is Dom0's ip PING 188.40.96.215 (188.40.96.215) 56(84) bytes of data. 64 bytes from 188.40.96.215: icmp_seq=1 ttl=64 time=0.045 ms ping 188.40.96.193 #Which is the gateway - fail PING 188.40.96.193 (188.40.96.193) 56(84) bytes of data. ^C --- 188.40.96.193 ping statistics --- 2 packets transmitted, 0 received, 100% packet loss, time 1013ms The system is debian lenny with a normal setup. Here is my configs: uname -a Linux green0 2.6.26-2-xen-686 #1 SMP Wed Aug 19 08:47:57 UTC 2009 i686 GNU/Linux cat /etc/xen/green1.cfg |grep -v '#' kernel = '/boot/vmlinuz-2.6.26-2-xen-686' ramdisk = '/boot/initrd.img-2.6.26-2-xen-686' memory = '2000' root = '/dev/xvda2 ro' disk = [ 'file:/home/xen/domains/green1/swap.img,xvda1,w', 'file:/home/xen/domains/green1/disk.img,xvda2,w', ] name = 'green1' vif = [ 'ip=188.40.96.238,mac=00:16:3E:1F:C4:CC' ] on_poweroff = 'destroy' on_reboot = 'restart' on_crash = 'restart' ifconfig eth0 Link encap:Ethernet HWaddr 00:24:21:ef:2f:86 inet addr:188.40.96.215 Bcast:188.40.96.255 Mask:255.255.255.192 inet6 addr: fe80::224:21ff:feef:2f86/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3296 errors:0 dropped:0 overruns:0 frame:0 TX packets:2204 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:262717 (256.5 KiB) TX bytes:330465 (322.7 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) peth0 Link encap:Ethernet HWaddr 00:24:21:ef:2f:86 inet6 addr: fe80::224:21ff:feef:2f86/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:3407 errors:0 dropped:657431448 overruns:0 frame:0 TX packets:2291 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:319941 (312.4 KiB) TX bytes:338423 (330.4 KiB) Interrupt:16 Base address:0x8000 vif2.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:27 errors:0 dropped:0 overruns:0 frame:0 TX packets:151 errors:0 dropped:33 overruns:0 carrier:0 collisions:0 txqueuelen:32 RX bytes:1164 (1.1 KiB) TX bytes:20974 (20.4 KiB) ip a s 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: peth0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000 link/ether 00:24:21:ef:2f:86 brd ff:ff:ff:ff:ff:ff inet6 fe80::224:21ff:feef:2f86/64 scope link valid_lft forever preferred_lft forever 4: vif0.0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff 5: veth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 6: vif0.1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff 7: veth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 8: vif0.2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff 9: veth2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 10: vif0.3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff 11: veth3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff 12: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UNKNOWN link/ether 00:24:21:ef:2f:86 brd ff:ff:ff:ff:ff:ff inet 188.40.96.215/26 brd 188.40.96.255 scope global eth0 inet6 fe80::224:21ff:feef:2f86/64 scope link valid_lft forever preferred_lft forever 14: vif2.0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 32 link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff inet6 fe80::fcff:ffff:feff:ffff/64 scope link valid_lft forever preferred_lft forever brctl show bridge name bridge id STP enabled interfaces eth0 8000.002421ef2f86 no peth0 vif2.0 ip r l Dom0: 188.40.96.192/26 dev eth0 proto kernel scope link src 188.40.96.215 default via 188.40.96.193 dev eth0 DomU: 188.40.96.192/26 dev eth0 proto kernel scope link src 188.40.96.238 default via 188.40.96.193 dev eth0

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• Confusion on networking service start/stop in Ubuntu

  - by Daniel Ball

  I'm preparing to move and took down two of my servers, leaving only one with some essential services running. What I neglected to consider was that one was the DHCP server(which I realized when somebody contacted me saying they couldn't connect. Whups). So because I only have a few hosts on this small network, I opted to just statically configure them for now. One of these is a new Ubuntu 11.04 server, where I have very little experience. I edited /etc/network/interfaces and /etc/hosts to reflect my changes. I ran $sudo /etc/init.d/networking stop *deconfiguring network interfaces ... So yay. Then I try to start, it gives me the mumbo jumbo about using services (why didn't it do that for the stop?) So instead I run ... $sudo service networking start networking stop/waiting Now, to me that says the status of the service is stopped. But when I ping another computer, I get a successful reply. So is it not actually stopped? More importantly, am I doing something wrong? Edit daniel@FOOBAR:~$ sudo service networking status networking stop/waiting daniel@FOOBAR:~$ sudo service networking stop stop: Unknown instance: daniel@FOOBAR:~$ sudo service networking status networking stop/waiting daniel@FOOBAR:~$ sudo service networking start networking stop/waiting daniel@FOOBAR:~$ sudo service networking status networking stop/waiting So you can see why I ran /etc/init.d/networking stop instead. For some reason upstart (that is what "services" is, right?) isn't working with stop. cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 FOOBAR 198.3.9.2 FOOBAR #Added entry July 19 2011 # The following lines are desirable for IPv6 capable hosts ::1 ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::1 ip6-allnodes ff02::2 ip6-allrouters cat /etc/network/interfaces # This file describes the network interfaces available on your system # and how to activate them. For more information, see interfaces(5). # The loopback network interface auto lo iface lo inet loopback # The primary network interface #auto eth0 #iface eth0 inet dhcp # hostname FOOBAR auto eth0 iface eth0 inet static address 198.3.9.2 netmask 255.255.255.0 network 198.3.9.0 broadcast 198.3.9.255 gateway 198.3.9.15 No I didn't save backups, it was just a minor change so I just commented out the old DHCP setting. Edit I set everything back to original settings and set up a DHCP server. "starting" networking does the same thing. I can only assume this is normal, I just don't know WHY. It can't be anything to do with the configuration files, since they've been restored.

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• Is there a social networking protocol

  - by Marwan

  Social networking is great, but there is something fundamentally wrong with the way social networking is implemented today in most popular services. I'll put it in this example: Imagine that there is no SMTP, and consequently, it is globally assumed and accepted that you can only send email to addresses on the same domain. The result would be the emergence of a single email service, let's call it emailbook.com, which we all have to subscribe to, if we really want to communicate with the world. This is what's happening with social networking today. You HAVE to use the same service your fiends/colleagues are using to talk to them. I would like to be able to put up my own social site, invite my friends who trust me, share amongst us, but still be able to share with the world at large. What are the chances of this scenario happening in the future? What does it take?

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