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• Split horizon, route filtering, and having RIPv2 announce a non-attached route to host

  - by Paul

  Routers A, B & C live at 10.1.1.1, 10.1.1.2 and 10.1.1.3 on a /24 metro Ethernet subnet. Each router also has its own private subnet on another interface. Router B's private subnet links thru a firewall to a 10.20.20.0 network at another organization. Router B redistributes to A and C several static routes for hosts on 10.20.20.0. However, a new host 10.20.20.5/32 must be reached via a different path that goes through router C. I know that C can advertise this host-based route with no problem, but I'd like to keep all my 10.20.20.x static routes in one place. So, how can B tell A via RIPv2 to send packets for 10.20.20.5/32 to C? So far it looks like I need no ip split-horizon on router B's 10.1.1.2 interface, perhaps because B has already learned from C other routes with a next hop of 10.1.1.3. But how does RIPv2 split horizon with no auto-summary and network 10.0.0.0 really work? If B learns a route to ANY 10.x.x.x network or host from A or C, is that enough for split horizon to keep it from redistributing ip route 10.20.20.5 255.255.255.255 10.1.1.3? And if I want to suspend split horizon only for this one new host, how do I filter out the mess of regurgitated routes that B advertises when I try no ip split-horizon? Thanks much.

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• Vista ICS issue

  - by Bill Grey

  I have a strange problem with Internet Connection Sharing on a laptop running Vista Business. This laptop is connected to the internet via the ethernet port, which goes to an ADSL modem. it is automatically assigned the IP address 192.168.1.50, and the modem/gateway is 192.168.1.1 My friends laptop is running Vista Home. Previously, I would create an ad hoc wireless network, enable ICS, and everything would be perfect. My friend would have internet access via this. However, something has now mysteriously broken. If I enable ICS on the wireless connection, it resets my Local Area Connection, assigning it the manual IP address of 192.168.0.1, which means my connection to the internet is destroyed. Both wireless adapters on each network are assigned auto configuration addresses, in the 168. range. They can see each other fine, but my friends laptop cannot access the internet via mine, even after I have restored the Local Area Connection settings. I understand the computer with ICS enabled must have the IP of 192.168.0.1, but previously, before whatever went wrong, my wireless adapter would be 192.168.0.1 and my friends computer would get an IP via DHCP. I have also tried setting static IP address and making a bridge, none of which works. How can I fix this problem, and prevent enabling ICS from touching my Local Area Connection? Both machines have no firewall, have appropriate settings etc...

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• Why would cat6 connectors not work with cat5e patch cable?

  - by Lee Tickett

  I had a naff batch of cat5 connectors (the latching mechanism didn't work) so decided to order in some cat6 connectors in preparation for the inevitable upgrade. My existing reel of for making patch cables is cat5e utp stranded. I made up a few cables and tested them- none of them worked. I recrimped and still nothing. When i check them with a multi-meter not all pins are connected. This reel has always worked with the previous cat5 connectors so I tested the cat6 connectors on a reel of solid cat5e cable and they work fine. Any ideas what I might be doing wrong? Or what might be at fault? (cable/connectors) and how I can diagnose? Thanks Lee

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• OpenVPN on Ubuntu 11.10 - unable to redirect default gateway

  - by Vladimir Kadalashvili

  I'm trying to connect to connect to OpenVPN server from my Ubuntu 11.10 machine. I use the following command to do it (under root user): openvpn --config /home/vladimir/client.ovpn Everything seems to be OK, it connects normally without any warnings and errors, but when I try to browse the internet I see that I still use my own IP address, so VPN connection doesn't work. When I run openvpn command, it displays the following message among others: NOTE: unable to redirect default gateway -- Cannot read current default gateway from system I think it's the cause of this problem, but unfortunately I don't know how to fix it. Below is full output of openvpn command: Sat Jun 9 23:51:36 2012 OpenVPN 2.2.0 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Jul 4 2011 Sat Jun 9 23:51:36 2012 NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables Sat Jun 9 23:51:36 2012 Control Channel Authentication: tls-auth using INLINE static key file Sat Jun 9 23:51:36 2012 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Sat Jun 9 23:51:36 2012 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication Sat Jun 9 23:51:36 2012 LZO compression initialized Sat Jun 9 23:51:36 2012 Control Channel MTU parms [ L:1542 D:166 EF:66 EB:0 ET:0 EL:0 ] Sat Jun 9 23:51:36 2012 Socket Buffers: R=[126976->200000] S=[126976->200000] Sat Jun 9 23:51:36 2012 Data Channel MTU parms [ L:1542 D:1450 EF:42 EB:135 ET:0 EL:0 AF:3/1 ] Sat Jun 9 23:51:36 2012 Local Options hash (VER=V4): '504e774e' Sat Jun 9 23:51:36 2012 Expected Remote Options hash (VER=V4): '14168603' Sat Jun 9 23:51:36 2012 UDPv4 link local: [undef] Sat Jun 9 23:51:36 2012 UDPv4 link remote: [AF_INET]94.229.78.130:1194 Sat Jun 9 23:51:37 2012 TLS: Initial packet from [AF_INET]94.229.78.130:1194, sid=13fd921b b42072ab Sat Jun 9 23:51:37 2012 VERIFY OK: depth=1, /CN=OpenVPN_CA Sat Jun 9 23:51:37 2012 VERIFY OK: nsCertType=SERVER Sat Jun 9 23:51:37 2012 VERIFY OK: depth=0, /CN=OpenVPN_Server Sat Jun 9 23:51:38 2012 Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key Sat Jun 9 23:51:38 2012 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Sat Jun 9 23:51:38 2012 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key Sat Jun 9 23:51:38 2012 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication Sat Jun 9 23:51:38 2012 Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA Sat Jun 9 23:51:38 2012 [OpenVPN_Server] Peer Connection Initiated with [AF_INET]94.229.78.130:1194 Sat Jun 9 23:51:40 2012 SENT CONTROL [OpenVPN_Server]: 'PUSH_REQUEST' (status=1) Sat Jun 9 23:51:40 2012 PUSH: Received control message: 'PUSH_REPLY,explicit-exit-notify,topology subnet,route-delay 5 30,dhcp-pre-release,dhcp-renew,dhcp-release,route-metric 101,ping 5,ping-restart 40,redirect-gateway def1,redirect-gateway bypass-dhcp,redirect-gateway autolocal,route-gateway 5.5.0.1,dhcp-option DNS 8.8.8.8,dhcp-option DNS 8.8.4.4,register-dns,comp-lzo yes,ifconfig 5.5.117.43 255.255.0.0' Sat Jun 9 23:51:40 2012 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:4: dhcp-pre-release (2.2.0) Sat Jun 9 23:51:40 2012 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:5: dhcp-renew (2.2.0) Sat Jun 9 23:51:40 2012 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:6: dhcp-release (2.2.0) Sat Jun 9 23:51:40 2012 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:16: register-dns (2.2.0) Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: timers and/or timeouts modified Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: explicit notify parm(s) modified Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: LZO parms modified Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: --ifconfig/up options modified Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: route options modified Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: route-related options modified Sat Jun 9 23:51:40 2012 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified Sat Jun 9 23:51:40 2012 ROUTE: default_gateway=UNDEF Sat Jun 9 23:51:40 2012 TUN/TAP device tun0 opened Sat Jun 9 23:51:40 2012 TUN/TAP TX queue length set to 100 Sat Jun 9 23:51:40 2012 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0 Sat Jun 9 23:51:40 2012 /sbin/ifconfig tun0 5.5.117.43 netmask 255.255.0.0 mtu 1500 broadcast 5.5.255.255 Sat Jun 9 23:51:45 2012 NOTE: unable to redirect default gateway -- Cannot read current default gateway from system Sat Jun 9 23:51:45 2012 Initialization Sequence Completed Output of route command: Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface default * 0.0.0.0 U 0 0 0 ppp0 5.5.0.0 * 255.255.0.0 U 0 0 0 tun0 link-local * 255.255.0.0 U 1000 0 0 wlan0 192.168.0.0 * 255.255.255.0 U 0 0 0 wlan0 stream-ts1.net. * 255.255.255.255 UH 0 0 0 ppp0 Output of ifconfig command: eth0 Link encap:Ethernet HWaddr 6c:62:6d:44:0d:12 inet6 addr: fe80::6e62:6dff:fe44:d12/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:54594 errors:0 dropped:0 overruns:0 frame:0 TX packets:59897 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:44922107 (44.9 MB) TX bytes:8839969 (8.8 MB) Interrupt:41 Base address:0x8000 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:4561 errors:0 dropped:0 overruns:0 frame:0 TX packets:4561 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:685425 (685.4 KB) TX bytes:685425 (685.4 KB) ppp0 Link encap:Point-to-Point Protocol inet addr:213.206.63.44 P-t-P:213.206.34.4 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1492 Metric:1 RX packets:53577 errors:0 dropped:0 overruns:0 frame:0 TX packets:58892 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:43667387 (43.6 MB) TX bytes:7504776 (7.5 MB) tun0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:5.5.117.43 P-t-P:5.5.117.43 Mask:255.255.0.0 UP POINTOPOINT RUNNING NOARP 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:100 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) wlan0 Link encap:Ethernet HWaddr 00:27:19:f6:b5:cf inet addr:192.168.0.1 Bcast:0.0.0.0 Mask:255.255.255.0 inet6 addr: fe80::227:19ff:fef6:b5cf/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:12079 errors:0 dropped:0 overruns:0 frame:0 TX packets:11178 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1483691 (1.4 MB) TX bytes:4307899 (4.3 MB) So my question is - how to make OpenVPN redirect default gateway? Thanks!

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• Internet Connection Sharing, can't Share Wireless

  - by GuyNoir

  I'm using Windows XP, and I've been trying to setup my laptop so that I can connect to the internet connection that I get on the laptop through my mobile on an ad-hoc network. I've set up an ad-hoc network, but when I try to select "allow other users to connect through this computers internet connection", the only options I have are the Local Area Connections. The tutorial I've been using says that Wireless Connection should be in that pull down menu. Any help?

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• How to view all connections through Router

  - by Anton8000

  So what I need to know is how find out who has been visiting what websites when through the router. It is similar to being able to History on browsers, but people can clear their history, or use Incognito mode. However, surely any data would be sent through the router so even if the person did clear their history or use incognito mode, you would be able to see what they had sent through the router, and what the internet had sent back. Is there any way to view all the connections that the router manages, and store all the data that it sends and receives and put them into, for example, a log file so I could view which computer had viewed what website at what time?

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• How to set Virtualbox appliance as webdev portable sollution?

  - by tenshimsm

  I just want to set a a Virtualbox virtual appliance to make it portable. Meaning that I'll enable a network config which will not need to be changed when I am using my laptop in a different network. I want the virtual machine to have internet access to keep it updated and be able to always have direct access from host using, for example, the IP 10.0.2.100 even when I am in a 192.168.0.1 network. So the first virtual network adapter will have a static ip (10.0.2.100) and the second will receive it from the DHCP. I don't know if 2 virtual adapters are needed or just one to accomplish that.

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• Router behind router network setup

  - by optimus

  My relative has bought a router instead of a switch which causes remote-access control issues on his network. His existing network has a 1st router where all PCs are connected via LAN cables. The 2nd router connnects to the 1st router and the remaining PCs are connected to the 2nd router via LAN cables. Normally, I would perform remote-access to help him out with some task. Now it seems all services behind the 2nd router are unavailable to me. How can I resolve this issue?

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• How can I close a port that appears to be orphaned by Xvfb?

  - by Jim Fiorato

  I'm running Xvfb on a FC8 Amazon EC2 image. On occasion Xvfb will crash (unable at the moment to find out the reason for the crash), and after crashing the TCP port will appear to be orphaned. I'm unable to get a PID to kill any process that may be using it. I'm starting Xvfb with: Xvfb :7 -screen 0 1024x768x24 & Examples of what I'm working with are below, the Xvfb port is (was) 6007: # netstat -ap Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 *:ssh *:* LISTEN 1894/sshd tcp 0 0 *:6007 *:* LISTEN - tcp 0 352 ip-10-84-69-165.ec2.int:ssh c-71-194-253-238.hsd1:51689 ESTABLISHED 2981/0 udp 0 0 *:bootpc *:* 1817/dhclient udp 0 0 *:bootpc *:* 1463/dhclient Active UNIX domain sockets (servers and established) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 2 [ ] DGRAM 871 668/udevd @/org/kernel/udev/udevd unix 2 [ ACC ] STREAM LISTENING 5385 1880/dbus-daemon /var/run/dbus/system_bus_socket unix 6 [ ] DGRAM 5353 1867/rsyslogd /dev/log unix 2 [ ] DGRAM 11861 2981/0 unix 2 [ ] DGRAM 5461 1974/crond unix 2 [ ] DGRAM 5451 1904/console-kit-da unix 3 [ ] STREAM CONNECTED 5438 1880/dbus-daemon /var/run/dbus/system_bus_socket unix 3 [ ] STREAM CONNECTED 5437 1904/console-kit-da unix 3 [ ] STREAM CONNECTED 5396 1880/dbus-daemon unix 3 [ ] STREAM CONNECTED 5395 1880/dbus-daemon unix 2 [ ] DGRAM 5361 1871/rklogd # lsof -i COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME dhclient 1463 root 3u IPv4 4704 UDP *:bootpc dhclient 1817 root 4u IPv4 5173 UDP *:bootpc sshd 1894 root 3u IPv4 5414 TCP *:ssh (LISTEN) sshd 2981 root 3u IPv4 11825 TCP ip-10-84-69-165.ec2.internal:ssh->c-71-194-253-238.hsd1.il.comcast.net:51689 (ESTABLISHED) Attempting to force the port closed with iptables doesn't seem to work either. iptables -A INPUT -p tcp --dport 6007 -j DROP I'm at a loss as to how to reclaim/free the port. From what I can tell, this port will remain in this state until the EC2 instance is shut down. So, how can I close this port so I can restart Xvfb?

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• Cannot access virtual machine via ping from the physical host machine

  - by Kenni

  I'm installing a FreeBSD Server on VirtualBox. I set up the IP address (192.168.10.5) for the virtual server to run a mail server and the host computer(Windows 7) with 192.168.10.184. The two machines cannot communicate or connect to each other. I cannot ping from the virtual machine to the host and vice versa. The host machine connects to a LAN. I want the mail server to run frm a VMachine. I think it's a problem with the network configuration of the virtual machine.

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• How to blacklist a problem wifi access point by MAC address in OSX

  - by Sam Alexander

  So I am a small mac-user cog in a larger windows-based network machine. The network here works fine for most everyone else (on PCs), but I have random timeouts and issues with the Wifi. Luckily, I have identified a few problem access points by MAC address (via their log messages in Console.app). Is it possible to tell my Airport on my Macbook to avoid those access points, and only speak with the access points who are far less touchy about me drinking the Apple kool-aid? All of the points are on the same network SSID.

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• SQL Server 2008 R2 transactional replication over VPN

  - by enashnash

  I'm having difficulty setting up replication over a VPN. I have a SQL Server 2008 R2, Enterprise Edition database on a Windows 2008 R2 Server. SQL Server is running on a non-standard port. I have set it up so that it is acting as its own distributor and have configured a publisher on this server. It is set as an updatable transational publication (yes, this is necessary). On this server, I have Routing and Remote Access enabled in order to be able to establish VPN connections. It is configured with a static IP address pool, of which the first in the range is always assigned to the server. I have assigned a test user a static address within this range (I don't know if this is necessary or not). All clients will be 2008 R2 versions, but could be SQL Express or standalone developer instances of the full product. I can establish a VPN connection from the client without problems and can see that the correct IP addresses are allocated. After connecting to the database to test that I can establish a connection, I realised that I needed to be able to connect to the database using the server name rather than an IP address - required for replication - which wouldn't work initially. I created an entry in the hosts file for the server on the client using the NETBIOS name of the server, and now I can connect to the server, from the client, using the SERVER\INSTANCE, PORT syntax, over the VPN. As it is the default instance on the server, I can also connect with simply SERVER, PORT syntax. After all that, I still get the following dreaded error: SQL Server replication requires the actual server name to make a connection to the server. Connections through a server alias, IP address, or any other alternate name are not supported. Specify the actual server name, 'SERVER\INSTANCE'. (Replication.Utilities). What have I missed? How do I get this to work? TIA

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• How do I fix this Windows 7 wireless connectivity issue?

  - by Charles Randall

  I have a laptop with an Intel Wireless Centrino 6300 module. Recently, the machine has stopped properly connecting to my wireless router. It will get stuck in a loop of connecting, then disconnecting and reconnecting. While connected, it will simply say "No Internet Access." Running inSSIDer 2.0, it shows my network jumping around between two channels -- I know this isn't the case, because I've set my router to sit on one single channel. My MacBook Pro, Boxee Box, PS3, and Xbox 360 all connect fine to the wireless and have no problems at all. I know it's not the wireless module, as I bought a second one recently assuming the first had died -- but I get the same behavior with both. Sometimes, I can fix the issue temporarily by deleting the network (Using the Manage Wireless Networks page), and then re-adding it (via standard wireless methods). Then it will work for a few days. But inevitably the problem comes back, and now the laptop simply won't connect to the wireless at all, even if I take steps that usually work. Since I've ruled out the hardware, and it's unlikely some kind of interference issue (because I would expect to see it on any multitude of other devices), I would think at this point that it's a problem with Windows itself. One thing that might be a hint, even though I delete the network, when I add it again, it's always listed as "Wireless Network Connection 2" even though there isn't another in the list.

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• Localhost problems on Mac OS X 10.7

  - by Maya

  Sorry for the duplicate post ( http://stackoverflow.com/questions/9720871/localhost-problems-on-mac-os-x-10-7 ), but I got the advice that this is a better place to ask my question: I want to access a mysql server remotely over ssh. So I used port forwarding to access the remote 3306 port on my localhost as 8383. The ssh connection can established successfully. But when I want to telnet onto port 8383 on localhost I get the following error: ~: telnet 127.0.0.1 8383 Trying 127.0.0.1... telnet: connect to address 127.0.0.1: Connection refused telnet: Unable to connect to remote host I tried the same on a friends Laptop (also Mac OS X 10.7) and it worked fine, so it is very unlikely that the ssh connection is the problem. I assume it has something to do with my local network configuration. I turned off IPv6, just in case. My /etc/hosts looks like this: 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost I would greatly appreciate any help. Please point me in the right direction if this is not the right place to ask this question.

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• Block all but http traffic on a network interface

  - by Oli

  I've got two network interfaces on an Ubuntu machine which go out to two different networks but both have internet gateways. I need to limit it so that any outgoing http requests it makes (ie through wget) only go through eth0 and all other traffic goes through eth1. I dare say the solution might have something to do with iptables but I've no experience with it so would appreciate all help.

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• What is a good layout for a somewhat advanced home network and storage solution?

  - by Shaun

  My home network/storage needs are changing and I am searching for some opinions and starting points on what a good network/storage layout would be that can serve my needs for a few years into the future. I think I have a decent starting point for equipment, but I am also willing to invest fairly heavily in a solution that can last me for a while. I am a bit of a tech nerd and I have a moderate tolerance for setup of the solution. I would prefer if maintenance of the system is somewhat low once it is setup, but I am willing to accept some tradeoffs. Existing equipment: Router - Netgear WNDR3700 (gigabit) Router - DLink Gamerlounge DGL-4300 (gigabit) Switch - 16 port Trendnet green switch (gigabit) Switch - 5 port Trendnet green (gigabit) Computer - i7-950 office computer (gigabit ethernet) Computer - Q6600 quad core media center, hooked up to TV, records shows (gigabit ethernet) Computer - Acer 1810T ultraportable laptop (gigabit and N ethernet) NAS - Intel SS4200-E (gigabit) External hard drive - 2TB WD Green drive (esata) All kinds of miscellaneous network connected TV, Bluray, Verizon network extender, HDhomerun TV tuners, etc. Requirements: -Robust backup solution for a growing collection of huge family picture files and personal files, around 1.5TB. (Including offsite backup) -Central location for all user's files, while also keeping them secure from each other. -Storage for terabytes of movie backups and recorded TV, and access to them from all computers (maybe around 4TB eventually) -Possibility to host files to friends and family easily Nice to have: -Backup of terabytes of movie backups Intriguing possibilities: -Capability to have users' Windows desktops and files look the same from all network computers I am not sure if the new Windows Home Server 2011 would fit into this well, if I need a domain server, how best to organize my backups, or how to most effectively use RAID. Currently I am simply backing up all computers to a RAID 1 on the NAS box, which I was thinking could prevent a situation where I reach for a backup and find that the disk is corrupt. One possibility that I am thinking about now is simply using my media center PC with a huge RAID of hard drives on which all files are stored. Pseudo-backup of all files would be present because of the RAID, but important files would also be backed up off site via carrying hard drives to work. But what if corruption seeps into the files and the corrupted data is then backed up? Does RAID protect against this? I really want to take next to zero risks with the irreplaceable files. I can handle some degree of risk with the movies and other files. I'm looking for critiques on this idea as well as other possibilities. To summarize, my goal is high functionality, media capable, and robust backup of irreplaceable files.

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• Realtek/Intel NIC transfer speed

  - by thepurplepixel

  I have just purchased a Gigabyte GA-X58A-UD7 motherboard, and it has dual Realtek RTL8111D gigabit LAN ports. I also have an Intel PRO/1000 MT PCI gigabit network card lying around from an old desktop. I've heard that Intel PCI-E network cards will often outperform Realtek, Marvell, or other non-Intel on-board network adapters, but my question is will the PRO/1000 MT PCI card outperform a single Realtek RTL8111D gigabit network adapter in terms of transfer speed, or should I keep what I have/buy a PCI-E Intel network adapter?

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• Locate rogue DHCP server

  - by Farseeker

  I know this is a serious long shot, but here we go. In the past week or so, for users connected to a particular switch in our network (there are four dumb switches all connected, and it only affects SOME, not all, users on the one switch) are getting DHCP addresses from a rogue DHCP server. I have physically checked every cable plugged into the switch in question to make sure that none of them have a router or wifi point attached to it. I know the IP of the DHCP server, but I cannot ping it, and it does not have a web interface. Does anyone have any suggestions on what I can do to locate it or shut it down? Unfortuantely all the switches are unmanaged, and as mentioned, there's no physical device (that I can find) plugged in to anything. It's getting critical, because it's screwing up the PXE boot of a whole bunch of thin clients.

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• Linux Mint Wireless doesn't connect

  - by guisantogui

  I'm having a great problem, I've installed Linux mint debian edition (LMDE), and following this tutorial http://community.linuxmint.com/tutorial/view/161 I did installed the network driver. The available connections appears to me, but when i try to connect to my connection at first time, I got this message: "(4) Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." And the following tries, I got this another message: "(32) Insufficient privileges." I'm accepting ideas. Thanks. EDIT: The last piece of the logs: Oct 5 00:22:38 gsouza-host ntpd[2116]: peers refreshed Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <info> (wlan0): bringing up device. Oct 5 00:22:42 gsouza-host wpa_supplicant[2055]: nl80211: 'nl80211' generic netlink not found Oct 5 00:22:42 gsouza-host wpa_supplicant[2055]: Failed to initialize driver 'nl80211' Oct 5 00:22:42 gsouza-host wpa_supplicant[2055]: rfkill: WLAN soft blocked Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <info> WiFi hardware radio set enabled Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <info> WiFi now enabled by radio killswitch Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <info> (wlan0): supplicant interface state: starting -> ready Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <info> (wlan0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42] Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <info> (wlan0): supplicant interface state: ready -> inactive Oct 5 00:22:42 gsouza-host NetworkManager[2019]: <warn> Trying to remove a non-existant call id. Oct 5 00:22:42 gsouza-host wpa_supplicant[2055]: rfkill: WLAN unblocked Oct 5 00:22:44 gsouza-host avahi-daemon[1827]: Joining mDNS multicast group on interface wlan0.IPv6 with address fe80::7ae4:ff:fe4a:13a9. Oct 5 00:22:44 gsouza-host avahi-daemon[1827]: New relevant interface wlan0.IPv6 for mDNS. Oct 5 00:22:44 gsouza-host avahi-daemon[1827]: Registering new address record for fe80::7ae4:ff:fe4a:13a9 on wlan0.*. Oct 5 00:22:46 gsouza-host ntpd[2116]: Listen normally on 7 wlan0 fe80::7ae4:ff:fe4a:13a9 UDP 123 Oct 5 00:22:46 gsouza-host ntpd[2116]: peers refreshed

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• How much network latency is "typical" for east - west coast USA?

  - by Jeff Atwood

  At the moment we're trying to decide whether to move our datacenter from the west coast (Corvallis, OR) to the east coast (NY, NY). However, I am seeing some disturbing latency numbers from my location (Berkeley, CA) to the NYC host. Here's a sample result, retrieving a small .png logo file in Google Chrome and using the dev tools to see how long the request takes: Berkeley to NYC server: 215 ms latency, 46ms transfer time, 261ms total Berkeley to Corvallis server: 114ms latency, 41ms transfer time, 155ms total some URLs if you want to try yourself: http://careers.stackoverflow.com/content/cso/img/logo.png (NY, NY) http://serverfault.com/cache/logo.png (Corvallis, OR) It makes sense that Corvallis, OR is geographically closer to Berkeley, CA so I expect the connection to be a bit faster.. but I'm seeing an increase in latency of +100ms when I perform the same test to the NYC server. That seems .. excessive to me. Particularly since the time spent transferring the actual data only went up 10%, yet the latency went up ten times as much! That feels... wrong... to me. I found a few links here that were helpful (through Google no less!) ... http://serverfault.com/questions/63531/does-routing-distance-affect-performance-significantly http://serverfault.com/questions/61719/how-does-geography-affect-network-latency http://serverfault.com/questions/6210/latency-in-internet-connections-from-europe-to-usa ... but nothing authoritative. So, is this normal? It doesn't feel normal. What is the "typical" latency I should expect when moving network packets from the east coast <--> west coast of the USA?

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• Network cabling with multiple patch panels?

  - by dannymcc

  I am in the very early stages of planning a network cabling upgrade in our office, mainly to upgrade the old cables from Cat5 to either 5e or 6. I am also planning on upgrading all of our 10/100 switches to 10/100/1000 switches. I would like to have three small wall mounted cabinets spread around the building, each with a patch panel and switch. These would all lead back to our server room. The question is; should I have two patch panels in each wall cabinet, one with 24 or 48 ports that are connected to a matching patch panel in the server room. The second patch panel would then link to each device in that cabinets area. Then I wouldn't put a switch in the small cabinets. All switching would be done in the server room. Or, should I have one main cable from the server room to each of the cabinets - plugged straight into the switch and the patch panel is for devices in the cabinets area? I hope that makes sense!

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• How to emulate wireless in Virtualbox?

  - by huahsin68

  I have WinXP install in virtualbox which host in Linux. I have a TP-Link (TP-WN321G) USB wifi adapter and have the driver installed inside WinXP. When I plug-in the wifi adapter, there is an option show "Ralink 802.11g WLAN [0101]" in the virtualbox's USB icon, tick on that option, the Device Manager able to detect the hardware which shows TP-Link, but when look into the properties, it says there is no driver was install. I did try to install Ralink driver but still no luck. Just curious why my wifi adapter is TP-Link, but the option show Ralink? May I know how can I emulate the wireless network inside WindowsXP?

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• Accessing apache in ubuntu 10 virtualbox guest from ubuntu 10 host

  - by Francis L

  I did the following: installed VirtualBox 3.1.6 OSE in ubuntu 10 desktop. installed ubuntu 10 server on a virtual machine in VirtualBox. select "LAMP server" and "OpenSSH server" options during the ubuntu server installation. leave network "adapter 1" of virtual machine as "NAT". use "VBoxManage" described in manual to setup port forwarding on the host (Protocol: TCP, GuestPort: 80, HostPort: 8080). verify "ExtraDataItem" have been added to "ubuntuServer1.xml" (my virtual machine name) correctly. run command "pgrep apache" in ubuntu server in virtual machine to ensure apache is running. Everything went well. But, when I try to access the apache from the browser on the host with "http://localhost:8080/", it just continue fetching with no response. Now, I'm struck! Please help! Many many thanks in advance!

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• Wireshark can see outside of the virtual machine?

  - by OSX Jedi

  I'm running Windows in a VM inside of OSX. If I start Wireshark inside Windows, then a message from OSX pops up saying that Wireshark is trying to monitor all network traffic. If I accept, then Wireshark starts showing all sorts of network activity. This can't be from Windows, because I don't have anything in there doing anything, but I am running things which are communicating through the internet in OSX. Is Wireshark able to see the network activity from OSX? How can it do this if it's inside a virtual machine?

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• OpenVPN on Android TCP retransmissions after OpenVPN server reboot

  - by anogaki

  I raised OpenVPN on server for the first time. It worked fine until the server rebooted. The firewall configuration is unchanged. When I tcpdump from tun interface on the server, I always get TCP retransmissions on all TCP packets larger than a few bytes in Android. Using a similar(read: same) configuration on my Linux box from where I'm posting this message now works just fine; no retransmissions, no loss. It did work just fine before the server rebooted. What could possibly cause this? I already tried rebooting Android, it didn't help. Client configuration, used on both Linux PC and Android tablet: dev tun client remote 192.168.0.1 persist-key persist-tun nobind pkcs12 user.p12 mssfix 1480 cipher AES-256-CBC verb 3 1480 is below the mtu of uplink connection on server which is 1492. I tried adding tun-mtu 1480 to Android but that didn't help either.

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