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• Handheld Linux device can't see one wireless network

  - by Nathan

  I'm using a Nokia N810 running OS 2008 (version 5.2008.43-7; should be the latest). It can see networks up and down the street in my neighborhood and can connect to mine using WEP. I can also connect to free networks at restaurants and the like. When I bring it into work, it can't see a wireless network ("No connections available"). When I use netstumbler on my laptop I can see a list of several essids showing green connectivity for the network. I know that the network has its essid broadcast, and I know that it's unsecured. When I run iwlist wlan0 scan, I see several APs with no essid, but I don't see anything with an essid set. I have verified using iwlist that my hardware supports the correct channels and speeds. I know this isn't a Nokia/mobile forum, but it's running what's basically a Debian kernel. Any suggestions on what to do in this case? I'm really frustrated by this. Thanks, Nathan

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• Wake On Lan for Fedora 12

  - by Toymakerii

  I have a fedora 12 box that I am using as a sandbox for web development and a few other toys. The box gets really hot so I would like it to sleep/hibernate when no one is using it, however most of the people connecting to the box will not be able to access it physically. Is it possible to set up a Wake On Lan that wakes up the machine when it detects an SSH connection? A google search didn't yield much information. (or atleast I wasn't smart enough to register it as useful!)

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• correct routing for multiple devices

  - by helmi

  I have Debian Lenny machine with 3 interfaces enabled (eth0-2), and I have problems as follow. eth1 is connected to a router and this router has portforwarding for port80. eth2 is connected direct to the internet If I open a website hosted on my system via the router it works fine. If I try to open the same via the eth2 connetion it does not! tshark shows incomming trafic on eth2 but nothing goes out there. iptabes accepts all My routing table: Ziel Router Genmask Flags Metric Ref Use Iface 10.9.0.2 * 255.255.255.255 UH 0 0 0 tun0 212.236.24.128 * 255.255.255.224 U 0 0 0 eth2 192.168.1.0 * 255.255.255.0 U 0 0 0 eth1 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 10.9.0.0 10.9.0.2 255.255.255.0 UG 0 0 0 tun0 default 192.168.1.1 0.0.0.0 UG 0 0 0 eth1 default 212.236.024.129 0.0.0.0 UG 0 0 0 eth2 default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0

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• How to prevent Ubuntu from combining networks on 2 NIC server?

  - by SolarPower

  I've got a Ubuntu Server 10.10 with 2 network interfaces with a cable plugged into both going to switches on completely different networks with different routers. One network is the 10.1.10.X network with a separate gateway/router - the server has an IP of 10.1.10.50 with the gateway IP of 10.1.10.1. The other interface is 10.2.10.X, IP 10.2.10.50, gateway 10.2.10.1. All my Mac machines are on the 10.2.10.X network, and all servers on the 10.1.10.X. The ONLY connection between the two is this machine. From a Mac in my office, I CANNOT ping any computer on the 10.1.10.X network except the Ubuntu machine I'm talking about. However, under the Shared column in Finder, I can see every server on the other network listed. That makes me believe that somehow this Ubuntu machine is letting certain requests span both networks, which is a security problem. Hope this is enough info.

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• Problem with Lenovo x200s Wifi under Ubutu Karmic

  - by oneself

  Hi, I have just gotten my Lenovo X200s laptop, and I am install Ubuntu 9.10 Karmic on it. The installation went through without a hitch, but I can't get my wifi to work. lspci | grep Network Produces the following results: 00:19.0 Ethernet controller: Intel Corporation 82567LM Gigabit Network Connection (rev 03) 03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10) The weird part is that when I turn the wifi hardware stitch on and off on the side of the laptop, I get the following printed in /var/log messages: Dec 30 23:24:48 temp-laptop kernel: [ 213.432302] usb 4-2: USB disconnect, address 2 Dec 30 23:24:52 temp-laptop kernel: [ 217.276310] usb 4-2: new full speed USB device using uhci_hcd and address 3 Dec 30 23:24:52 temp-laptop kernel: [ 217.441759] usb 4-2: configuration #1 chosen from 1 choice Does Ubuntu think my wifi card is a USB device? Am I missing some driver? What can I do to fix this? Please, help!

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• Bridged network on OS X only gets UDP broadcast traffic

  - by a paid nerd

  I've created a bridged network Mac OS X 10.8.5 using ifconfig and TUNTAP for OS X to bridge my wireless connection, en0, with a virtual interface, tap0, which I can use for guest VMs: $ sudo sysctl -w net.inet.ip.forwarding=1 $ sudo sysctl -w net.link.ether.inet.proxyall=1 $ sudo sysctl -w net.inet.ip.fw.enable=1 $ sudo ifconfig bridge0 create $ sudo ifconfig bridge0 addm en0 addm tap0 $ sudo ifconfig bridge0 up $ ifconfig en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 28:cf:xx:xx:xx:xx inet6 xxxx::xxxx:xxxx:xxxx:xxxx%en0 prefixlen 64 scopeid 0x4 inet 192.168.100.64 netmask 0xffffff00 broadcast 192.168.100.1 media: autoselect status: active bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether ac:de:xx:xx:xx:xx Configuration: priority 0 hellotime 0 fwddelay 0 maxage 0 ipfilter disabled flags 0x2 member: en0 flags=3<LEARNING,DISCOVER> port 4 priority 0 path cost 0 member: tap0 flags=3<LEARNING,DISCOVER> port 8 priority 0 path cost 0 tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 ether ca:3d:xx:xx:xx:xx open (pid 88244) However, if I tcpdump -i tap0, I only see broadcast traffic. Shouldn't I see a mirror of everything on en0? (192.168.100.33, the host doing the broadcasting, is another unrelate, noisy server on my LAN.) (I asked a similar question here and will probably close it.)

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• allow SSH to bypass VPN on OSX mavericks, openvpn, pf

  - by zycho42

  My home computer connects to the internet through an OpenVPN connection. However, I would like to be able to connect to my home computer from outside over ssh. Ssh is set up and working, but when I connect to the vpn ssh is only accessible from inside my home network. I figure what's going wrong is my router forwards incoming ssh connections to my mac, but then my mac replies over the vpn, so the connection from outside times out. I've got pf set up for a couple of other things, but I can't figure out how to let the ssh replies bypass the vpn using pf. I've come across other solutions that use ip tables, routing tables and rules, but I can't figure out how to set that up on mavericks. I've been searching for this for a while now but I haven't found a working solution. Any help would be greatly appreciated!

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• Most secure way of connecting an intranet to an external server

  - by Eitan

  I have an internal server that hosts an asp.net intranet application. I want to keep it completely and utterly secure and private however we need to expose some information through a WCF service to another server which hosts our external websites which CAN be accessed by the public. What is the best way to pass information between the two servers with regards to an IT setup, while keeping the intranet in house server completely secure and inaccessible? I've heard VPN was the way to go but I wanted to be sure this was the safest way. Another question what would be the most secure way of passing data in the WCF service?

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• Loadbalance UDP traffic with session affinity and way to take servers in & out of rotation

  - by William

  What is the best way to go about load balancing UDP traffic among a whole bunch of servers, while keeping session affinity based on the users' IP? I need to also be able to take servers in and out of rotation for new clients, so when they join for the first time, they get put on a server in a list of available servers, and clients already connected would stay connected to their specific server. I have written the software to maintain a list, but I can't seem to find anything that would perform this functionality. If you need the context, this is to facilitate game tournaments for Minecraft: Pocket Edition, which is done with UDP traffic, I cannot change the protocol. And, because tournaments open and close, I need to be able to place players on their proper servers. Performance is also a priority, I have a program to do this but it is very bloated and slow. Thanks for any help! William

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• How do I increase my home's bandwidth?

  - by Derek

  I just mistakingly posted this on Stack Exchange but don't know how to delete it... Anyway, I was thinking of building a home server to use instead of renting a VPS, because in the long run it would be cheaper. What I'm concerned with is the bandwidth limit of my house. I know when I'm downloading something off the internet, if I download at high speeds the rest of the computers connected to my router will become slower. Is there any way to avoid this? There are other cable outlets in my house, will connecting a modem and router there avoid this problem?

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• Log centralization, display, transport and aggregation at scale v2

  - by Eric DANNIELOU

  This is a duplicate question of Log transport and aggregation at scale and http://stackoverflow.com/questions/1737693/whats-the-best-practice-for-centralised-logging, but the answers might differ now : The softwares described in 2009 may have changed since (for example Octopussy evolved from version 0.9 to 1.0.5). Rsyslog has become the default on most linux distro. Requirements have changed (security, software configuration management, ...). I'd like to ask the following questions : How do you centralize, display and archive system logs? How would you like to do it now if you had to? Most linux distro use rsyslog nowadays, which can provide reliable log transport. But some older unices, network devices and maybe windows box still use old udp rfc-style transport. How did you manage to get reliable transport? Storing logs for a few months can represent a huge amount of disk space. How do you store them? rdbms? Compressed and encrypted text files?

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• Should I enabled 802.3x hardware flow control?

  - by Stu Thompson

  What is the conventional wisdom regarding 802.3x flow control? I'm setting up a network at a new colo and am wondering if I should be enabling it or not. My oh-cool-a-bright-and-shiny-new-toy self wants to enable it, but this seems like one of those decisions that could blow up in my face later on. My network: An HP ProCurve 2510G-24 switch A pair of Debian 5 HP DL380 G5's with built-in NC373i 2-port NIC LACP'd as one link. 9000 jumbo frames enabled. (Application) A pair of hand-built Ubuntu server with 4-port Intel Pro/1000 LACP'd as one link. 9000 jumbo frames enabled. (NAS) A few other servers with with single 1Gbps ports, but one with 100Mbps. Most of this kit is 802.3x. I've been enabling it as I go along, and am about to test the network. But as my 'go live' day nears, I am worried about the 802.3x decision as I've never explicitly used it before. Also, I've read some 10-year old articles out there on the Intertubes that warn against using flow control. Should I be enabling 802.3x hardware flow control?

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• Rate limit a wireless interface

  - by Jamie Hankins

  I have access to my routers SSH and IPTables. I want to rate limit my guest network to 1Mb/s so they can't guzzle my bandwidth. rai1 RTWIFI SoftAP ESSID:"GuestNetwork" Nickname:"" Mode:Managed Channel=6 Access Point: :F9 Bit Rate=300 Mb/s wdsi0 RTWIFI SoftAP ESSID:"YouCan'tTouchThis" Nickname:"" Mode:Managed Channel=6 Access Point: :F8 Bit Rate=300 Mb/s wdsi1 RTWIFI SoftAP ESSID:"YouCan'tTouchThis" Nickname:"" Mode:Managed Channel=6 Access Point: :F9 Bit Rate=300 Mb/s wdsi2 RTWIFI SoftAP ESSID:"YouCan'tTouchThis" Nickname:"" Mode:Managed Channel=6 Access Point: Not-Associated Bit Rate:300 Mb/s wdsi3 RTWIFI SoftAP ESSID:"YouCan'tTouchThis" Nickname:"" Mode:Managed Channel=6 Access Point: Not-Associated Bit Rate:300 Mb/s I'm just wondering the command I need to limit it. I tried the iwconfig limit command but it failed. Thanks

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• Using two ports on my ZyXel USG gateway to patch two devices together?

  - by Matthew Beza

  I don't know if this is possible but it would save me many long drives! I have drawn, with my epic MS Paint skills, my current setup. I have a ZyXel USG300 Gateway with a built in 5 port switch. It supports bridging, tunnles, VLANs, etc.. I have a Cisco WLC2112 plugged into port 6 (P6). The cisco is set to 192.168.6.2 and P6 is set to 192.168.6.1. This works but I need to incorporate a Nomadix AG3000 to handle guests. (Router (A) in the picture). So I need the Cisco WLC2112 to use the Nomadix as if it where plugged into it's LAN port. Right now the Nomadix WAN Port is plugged into (P2) on the ZyXel, and the Nomadix LAN port is plugged into (P3). Is it possible to set something up where (P3) and (P6) are somehow "Patched" as if the Cisco was plugged directly into the Nomadix LAN port? Basically making the ZyXel a fancy Cat5e coupler?

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• unable to ping hostname, but \\hostname\\c$ works!?

  - by ciscokid

  I'm having a strange issue on my initial lab setup. Situation: Host with OS Server 2008 R2 64bit, on this host a Virtual Machine in Hyper-V with OS Server 2008 SP1 32bit. The virtual machine has a fixed ip, and is referring to itself for the preferred DNS Server (dns server role has been installed). The host has tcp/ip set to automatic (so automatic ip from router, and dns/gateway = router). Both are able to ping each other on IP address (same ip range). Both are NOT able to ping each other on hostname (sounds logic because virtual machine dns server does not yet have a dns record for the hostmachine). But here's the strange thing: I am able to set up a working network mapping on the Virtual Machine to the host: \hostname\c$. The first thing I thougt was 'something' is blocking the ping request, so I completely disabled Windows Firewall on both Virtual Machine and host. Still pinging on hostname in both ways didn't work, yet I am able to access the network mapping on hostname. There is no extra software installed on both systems (clean windows server 2008).Can someone tell me what is causing this? I always thought: ping on IP address works = network mapping on IP address works. Pinging on hostname doesn't work = network mapping on hostname doesn't work neither. Where am I wrong? Looking forward to your advice!

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• Linux Transparent Bridge for Network

  - by Blackninja543

  I am attempting to set up a semi-transparent bridge. I say semi because I want it to act as a transparent tap for all traffic moving through both sides of the bridge. What I also want is to have the "green zone" accessible to a web interface for the bridge that will display all results of the IDS and other network monitoring tools. My example would be as such: eth0 <--> bridge(br0) <--> eth1 The entire network would be on the same subset however anything coming from eth0 to eth1 would be accepted. The only time anything would be drop is if the eth0 attempted to access br0. If someone attempts to access the web interface on br0 through eth1 it will succeed. My biggest problem I feel is if I attempt to block anything from eth0 to br0 this will drop the bridge all together.

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• How can I get my routers to forward ports correctly?

  - by Giffyguy

  My network currently looks like this (simplified): Note that Router #2 is connected to the LAN interface of Router #1. This should be familiar to anyone who has seen a standard static-IP setup with an additional firewall for a residence or other small building. Router #1 is actually my cable gateway, but since it is a fully functional router/firewall, I am going to refer to it as a router. Now, I need to open various ports in both firewalls for incoming communication to my server - port 80 is a good example. So I've opened up port 80 in Router #2, and so far all incoming traffic at the public IP X.X.X.129 is being routed correctly. The problem is that I also need my server to respond to incoming traffic at the public IP X.X.X.130 on the WAN interface of Router #1. Naturally, I can't just tell Router #1 to forward port 80 to another public IP. Port forwarding is only supported when the traffic is being directed to the LAN subnet. I am willing to restructure my network topology if required, with the following conditions: Router #1 cannot have its WAN IP reassigned - X.X.X.130 is mandatory. Router #1 cannot be moved or disconnected from the cloud. The server cannot be given a second IP address. I would prefer the server to have a private IP address - e.g. 10.0.0.10 I'd like to keep Router #2, but it can have a private IP - e.g. 10.0.1.10 Following these rules, I need to get my server to receive incoming traffic on port 80 from both public IP addresses. Does anyone on SU know if this is possible? So far my only theories have been to set up a static route on either router, or to somehow combine my two subnets into a single subnet.

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• Router reconfigures PC's and they can no longer access the internet via hardwired connection to DSL Modem

  - by zchads

  Router reconfigures PC's and they can no longer access the internet via hardwired connection to DSL Modem. Hardware Information: Buffalo Wireless Router/access point, Model: WZR-HP-G300NH-AP DSL Modem: Generic (actually not sure of manufacture). Service Provider: TOT (Thailand) Laptop-1: Windows XP and Belkin PCMIA Network Card Laptop-2: Windows XP unknown network card & Wifi Laptop-3: Windows 7 unknown network card & Wifi Outline of Problem/actions taken: After a recent power failure the router and laptop-1 connected to router were no longer able to access the internet. Actions taken to try and recover internet access: Using Laptop-1 tried to configure Router with PPPoe settings using software from Router Manufacture. During the installation process a Timeout error was experienced, unable to connect to WAN. Used Internet Explorer to communicate directly with Router using IP address. Changed settings to use PPPoe settings given by ISP. Router was not able to communicate with Internet. Repeated steps 1-4 again with no success. Reset Router and DSL modem. Repeated steps 1-4 again still no success. Tried connecting Laptop-1 directly to DSL to gain access to internet to research problem. No Network connection with DSL could be established…connection would be established for a second and then be lost and didn’t appear long enough to actually connect to DSL. Replugged LAN back into Router and connection was regained with laptop-1. Replugged Laptop-1 directly into DSL and again unable to establish network connection. Uninstalled network card and all of its drivers on Laptop-1. Reinstalled network card and drivers and tried connecting directly to DSL. Still unable to make network connection. Plugged DSL into Laptop-3 and Internet connection was established. Being Laptop-3 does not have a CD-Rom, Laptop-2 was tried to connect to the router. With Laptop-2 steps 1-7 ended up being repeated without success. Tried plugging Laptop-2 directly into DSL and again no network connection could be established. Using Laptop-3 with a direct connection to DSL downloaded latest Router FW. Installed router FW using Laptop-1. Tired the installation process again without success. Being desperate reinstalled OS on Laptop-1 still not success. Tried using “ipconfig” with router to see what was going on without success. With laptop-1 connected to DSL went through the “ipconfig /…” inputs to see if anything made a difference. Being the network card was not able to make a connection this provide very little information “media disconnected”. So now I have a router and two laptops which are unable to connect to the internet and sure could use some advice/help.

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• Failed to mount to nfs server with "Program not Registered"

  - by Farrel

  I'm trying to setup nfs server on Fedora 17 and I'm getting "Program not Registered" error when I'm trying to mount. I guess the main reason for this is rpcbind. I'm a newbie in linux, so I don't know what info should I provide you with. Here is some info that might be useful. rpcinfo -p program vers proto port service 100000 4 tcp 111 portmapper 100000 3 tcp 111 portmapper 100000 2 tcp 111 portmapper 100000 4 udp 111 portmapper 100000 3 udp 111 portmapper 100000 2 udp 111 portmapper 100005 1 udp 20048 mountd 100005 1 tcp 20048 mountd 100005 2 udp 20048 mountd 100005 2 tcp 20048 mountd 100005 3 udp 20048 mountd 100005 3 tcp 20048 mountd 100024 1 udp 42223 status 100024 1 tcp 50054 status cat /etc/exports /home/Farrel/prog 192.168.xxx.xxx (ro,sync) service nfs status Redirecting to /bin/systemctl status nfs.service nfs-server.service - NFS Server Loaded: loaded (/usr/lib/systemd/system/nfs-server.service; enabled) Active: active (exited) since Fri, 02 Nov 2012 09:29:04 +0300; 5min ago Process: 924 ExecStartPost=/usr/lib/nfs-utils/scripts/nfs-server.postconfig (code=exited, status=0/SUCCESS) Process: 909 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS ${RPCNFSDCOUNT} (code=exited, status=0/SUCCESS) Process: 885 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS) Process: 864 ExecStartPre=/usr/lib/nfs-utils/scripts/nfs-server.preconfig (code=exited, status=0/SUCCESS) CGroup: name=systemd:/system/nfs-server.service Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable. Firewall is disabled on both systems. I spent a lot of time reading on the topic but all manuals on setting up nfs server lead to "Program not Registered" error. Any how-to-fix-it ideas?

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• VMware vSwitches and Dell PowerConnect BPDU guard

  - by dunxd

  I am using two Dell PowerConnect 6248 switches to connect a VMware host vSwitch. A discussion of config of Cisco switches for use with VMware advises to set physical ports connected to vSwitch with bpduguard and portfast. However, Dell switches don't have the bpduguard setting for individual ports. I can switch it off globally for all portfast ports, but I don't think I want to do that. Should I: Disable STP on the vSwitch connected ports? Leave STP on and enable portfast on the ports, and forget about bpduguard? Disable bpduguard on all portfast ports via global config Do something else? See also: VMware vSwitches and spanning tree

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• Where should executables be run from? Network share or client?

  - by user74150

  We have an executable that is used by 50+ client machines on a network and upgraded regularly. Is it acceptable to put the executable on a network share and have the client machines run it from there via a shortcut on their desktop? That way when we upgrade the .exe we can simply replace the one file with a new one and all clients will be accessing the new one. How will a slow or unstable network handle this? If this is not acceptable, what would be the best way to keep all clients updated with the latest .exe?

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• 2 nics. 2 Defaults Gateways

  - by andre.dias

  Here is my scenario: i have this server with 2 nics, each one with different IPs, connected to differents routers. Almost everything is configured whe way i need. Traffic coming from eth0 exits using eth0, traffic coming from eth1 exits using eth1. And there is a default gateway configured. $route: default IP 0.0.0.0 UG 0 0 0 eth0 With this configuration, the traffic generated in the server is going out using eth0 (lynx www.google.com for example). The problem is: the Internet link from eth0 went down today. The traffic coming from eth1 was ok...no problem. But the traffic generated in the server was a problem...the default gateway was out...no access do the Internet anymore (no more lynx www.google.com) So i added a new default gateway configuration, pointing to eth1. For 30 minutes i kept that way...2 default gateways, but just one was "working"...and everything was working just fine. But then i removed de eth0 gateway entry because, well, 2 default gateways is kind of weird. My question: is there any problem on keeping these 2 default gateways, one for each? So i don´t need to do nothing when one link go down again? $route: default IP1 0.0.0.0 UG 0 0 0 eth0 default IP2 0.0.0.0 UG 0 0 0 eth1

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• How to get Windows 7 to automatically connect to an ad-hoc network?

  - by George Edison

  I have two machines - one is running Ubuntu 12.04 64-bit and the other is running Windows 7 Starter Edition (32-bit). The Ubuntu machine is connected to the Internet via the eth0 interface. That machine also has a wireless network interface (wlan0) that is currently functioning as an ad-hoc network. I can connect to the ad-hoc network just fine with the Windows machine but each time I wish to do so, I must manually initiate the connection and enter the password. Is there some way to instruct Windows to automatically connect to this network (an option I have for standard wireless networks but not ad-hoc networks)?

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• Connect a PC to Mac OS X Server

  - by Paul Sheldrake

  I'm trying to connect to a server at work which is run on a Mac but I have a PC (windows 7) at home. I have path to connect in the format of afp://server.com/files. Is there a client that I need to install on my PC that I can use to login? Thanks, Paul

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• How to set WAN side buffers for WRT54GL running Tomato Firmware

  - by Vickash

  I've recently set up a machine running m0n0wall to try and fight buffer bloat and do some traffic shaping. It was more convenient (geographically speaking) to connect the cable modem directly to my old WRT54GL, then pass everything to the m0n0wall machine and have that do the real routing work. It took a bit of work, but it's working pretty well. I have a cable connection. I have m0n0wall set up to utilize only 90% of the specified speed of my subscription, which is fine. But I've noticed that at certain times of the day (possibly when my true bandwidth drops below that 90%), there's more latency if the connection is used heavily, and traffic shaping doesn't seem to work as well. I suspect this is caused by the buffers on the WRT54GL still being unnecessarily large. If the connection is working as expected, they won't get filled, but in times of reduced bandwidth they would. Does anyone know the command I need to execute, on the WRT54GL running Tomato Firmware, to reduce the buffers on the WAN interface to the minimum size possible?

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