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• How to make Linux to re-detect network interfaces?

  - by ablmf

  For some reason, ifcfg-eth* under /etc/sysconfig/network-script were deleted. Is there any tools that could detect network interfaces and re-generate these files? Another question : If I manually added ifcfg-eth0, is there any method to make it work without reboot? I tried "/etc/init.d/networking restart", and it doesn't work.

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• What software is responsible for connecting to the wireless net specified in /etc/network/interfaces?

  - by zuba

  I'm curious what software (package, utility in bin's) handle interface parameters in /etc/network/interfaces and decides to connect to the specified wireless net. I use wifi usb stick dlink DWL-110 attached to wlan0 with ndiswrapper driver. Sometimes wlan0 sees my wifi net - iwlist wlan0 scan shows it, but does not connect to it - iwconfig shows AP Not-Associated, until I replug the stick. Neither reinserting module with ndiswrapper, not ifdown/ifup or restarting networking helps. That is why I need to know what OS entity handles connection/reconnection to wireless net. EDIT: shame on me, I use wireless-tool package with wep encryption

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• How can an application (like Firefox) be forced to use a certain network interface?

  - by Lekensteyn

  I've two interfaces: eth0 and wlan0 on a notebook. Possible use cases: eth0 grants me Internet access, and wlan0 is currently connected to a router which does not have Internet-connectivity. For development purposes, I need to connect to the wlan0 by default, but use eth0 for surfing eth0 and wlan0 are both connected to the Internet. For a torrent application, eth0 should be used for speed, but for portability of the notebook, SSH should have a connection over wlan0 eth0 is a wire connection, wlan0 is a wireless one. Sensible data should be transferred over eth0, but other traffic can go over wlan0 as well. Is there a way to force applications (like nc.traditional or firefox) to use a certain network interface? A wrapper like example-wrapper eth0 program is fine too if such program exist. It would be nice if it could configured within Firefox (in runtime). I'd like to avoid IPTables solutions if possible.

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• How many megabytes per second may I expect from a gigabit USB 2.0 network card under linux?

  - by Nakedible

  I'm interested in the actual real-word throughput attainable with an external 1000BaseT USB 2.0 network card under Linux. I have been able to attain 90 megabytes per second on a PCI-E interface, but the USB 2.0 bus has a theoretical limit of 480Mbit/s, and in practice less than 40 megabytes per second. Is the actual throughput attainable with such a card under linux 40, 30, 20, or even as low as 10 megabytes per second, eg. no better than a normal 100BaseT network card?

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• Why Can't Computers Off My Network See the Site? [migrated]

  - by nmagerko

  Have just set up Apache, PHP, MySQL, etc. on my Ubuntu OS, and I was wondering why computers that are not on my network can not see the basic index.html that Apache uses as the default. I set up the static ip address for my computer, and I use 192.168.1.100 for computers to view the simple site. Is there something I am missing that will allow others to access my site? (It is REALLY simple; no graphics, CSS, etc.)

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• Why is a network ID not needed to connect to an IP address?

  - by baddogai

  I know how IP basically works, and knows that an IP address composed of a network ID portion and a host ID portion, but when I type a IP address, say 8.8.8.8 into the web browser, I didn't supply any subnet mask information. So, how does the browser know where the dividing line is between the network ID and host ID? Since 8.8.8.8 may mean 8.8.8.8/8, 8.8.8.8/24 etc. In a nutshell, the IP address I supplied is ambiguous.

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• Any good utilities for configuring network settings on Windows XP?

  - by StackedCrooked

  I don't really like the built-in tools for configuring the network settings on Windows XP. If for some reason I can't access the internet I never know where to look. Does anyone know of a good utility for fixing your internet or local network?

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• SQLAuthority News Were sorry but your computer or network may be sending automated queries. To pro

  I use multiple browser many times when I am working with multiple projects simultaneously. Often I use Google Reader to read few feeds. Recently, I faced the following error and this error will not go. I even restarted my computer and rebooted my network. I am confident that my computer does not have viruses or [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• How can an application (like Firefox) be forced to use a certain network interface?

  - by Lekensteyn

  I've two interfaces: eth0 and wlan0 on a notebook. Possible use cases: eth0 grants me Internet access, and wlan0 is currently connected to a router which does not have Internet-connectivity. For development purposes, I need to connect to the wlan0 by default, but use eth0 for surfing eth0 and wlan0 are both connected to the Internet. For a torrent application, eth0 should be used for speed, but for portability of the notebook, SSH should have a connection over wlan0 eth0 is a wire connection, wlan0 is a wireless one. Sensible data should be transferred over eth0, but other traffic can go over wlan0 as well. Is there a way to force applications (like nc.traditional or firefox) to use a certain network interface? A wrapper like example-wrapper eth0 program is fine too if such program exist. It would be nice if it could configured within Firefox (in runtime). I'd like to avoid IPTables solutions if possible.

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• Google Chrome Browser does not display the images from Local network or local host? [migrated]

  - by Arjang

  While developing and testing a site on local network I have noticed that while IE/FireFox would display the images coming from URL's like "http:\mypc" or "http:\localhost" or ip adress on the netwrok , google chrome on Galaxy, Windows Machine, or google Android will not display the images. After having burned too many hours trying various CSS, image src tag, html document description tricks, I have given up. During my search I found (and lost) the link to chrome forums regarding this issue that seemed to say it is just so by users. Anyone has any more information on weather it is possible to view images on local host/computer name on netwrok or ip adress?

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• How do I access an external drive mounted on a machine on my own network?

  - by avilella

  I've got one desktop computer Ubuntu 11.04 with an external USB drive mounted on it on the home WRT54L Linux network (192.168.0.2), and when I arrive at home with my laptop, I want to be able to mount the external USB drive from my Ubuntu 11.04 laptop (192.168.0.3) to the desktop, without having to unplug it from the desktop, that is accessing it. Is it possible to send a remote mount command to the desktop usb drive from my laptop? Ideally something that creates a local mountpoint I can just call locally from the programs installed in my laptop, like: username@laptop ~ ./myprograminlaptop /my/file/which/is/actually/on/the/desktop/file.txt

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• Iomega Home Media Network Hard Drive 1TB Cloud Edition failed, data recovery?

  - by lonbon69

  I have a Iomega Home Media Network Drive Cloud Edition 1TB that started clicking and then displayed a failure LED code Power LED and Red LED. I removed the SATA drive and inserted in a 'All in 1 HDD Docking Station' and connected to laptop by USB - Laptop has Win 7 OS. The dock is seen as drive E but cannot access and says 0% data etc. The drive does spin up when I power the dock. Web searches say the drive has EXT3 file system and to use Ubuntu to access drive. I have now setup a dual boot laptop but still do not see the drive using ubuntu. Is there something else I need to do to get it recognised etc. I really would like to recover the data, any suggestions please?

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• 12.04: I need a new network card - and I think this one may work?

  - by Jason Malone

  I found this list of compatible USB wireless network adaptors: http://www.cyberciti.biz/tips/linux-usb-wireless-compatibility-adapter-list.html Listed here is the Belkin F5D8053. I'm looking for a store to buy a suitable adaptor in locally and I can't find that particular adaptor - but I can see a Belkin F7D4101az. I think this is simply a newer model - but a Google search for "ubuntu belkin f7d4101az" brings no results - not even people trying to get it to work. Nothing. So I didn't want to purchase it without being sure. There's really only one PC shop that sells this sort of stuff around here - so here's a list of all my available options: http://www.pcworld.co.uk/gbuk/wireless-cards-adapters/xx_7088_70095_xx_xx/xx-criteria.html I'd really like to get one today, because I have a lot of work to do and don't really want to have to wait a week for a new adaptor - I spent 6 or 7 hours last night trying to get my Dell 1450 to work with no luck. Any help would be much appreciated.

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• How is network traffic routed (VPN vs. 'open')?

  - by craibuc

  If my workstation has a VPN connection to a given network (a client's, for instance) and an open connection, what determines how a request for a network resource (e.g. a web page) is routed? Moreover, given that a resource (e.g. google.com) could be available via either route (i.e. VPN or non-VPN), how is this route determined? Is there a way to 'force' the routing to use a given route or the route with lower overhead?

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• No external network on ubuntu 9.10, though dns works..

  - by user29368

  Hi, I have a weird problem I cant solve. I have several computers, two with xubuntu 9.10 One of them, acting as a media server, has stopped to work when it comes to external network.. I can do for example: ping google.com Which gives me an ip adress back, like: name@Media:/etc$ ping google.com PING google.com (66.102.9.147) 56(84) bytes of data. That tells me it reaches the dns?, but I get no response at all... If I ping a local computer all works fine. I can also reach the computer via ssh without any problems. I have always used network manager, but now I uninstalled it and made the settings manually like this: /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.1.52 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 Still no luck. I have no specific settings for this one in my router, and all the other computers, including my win laptop works fine. This is very annoying since I cant even do an update or anything.. ifconfig looks like this: eth0 Link encap:Ethernet HWaddr 00:24:1d:9f:10:89 inet addr:192.168.1.52 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::224:1dff:fe9f:1089/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:15410 errors:0 dropped:0 overruns:0 frame:0 TX packets:2693 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1167398 (1.1 MB) TX bytes:694973 (694.9 KB) Interrupt:27 Base address:0xe000 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:2150 errors:0 dropped:0 overruns:0 frame:0 TX packets:2150 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:143456 (143.4 KB) TX bytes:143456 (143.4 KB) route -n like this Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 1000 0 0 eth0 0.0.0.0 192.168.1.1 0.0.0.0 UG 100 0 0 eth0 I do not know where the adress starting with 169.254 comes from.. Could that be a part of the problem? Hoping for some assistance since Im totally stuck here.. /george

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• How can I make the Windows VPN route selective traffic (by destination network)?

  - by Legooolas

  I want to use a windows VPN but only for a particular network, so that it doesn't take over my entire network connection. e.g., Instead of the VPN becoming the default route, make it only the route for 192.168.123.0/24 (I can see that there is a solution for this for Ubuntu in this question, but sometimes I have to do this on Windows too) Can this be automated so that whenever I connect to the VPN it does this?

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• Is a VPN a good method for protecting data in an untrusted network? [closed]

  - by john

  I will be connecting my laptop in an untrusted network. If I setup OpenVpn on a server and use a vpn client on the laptop to connect through it, is it enough? Can someone perform a MITM attack or otherwise eavesdrop on my traffic? If someone on the local network port-scans my laptop, will the open ports be accessible to him while I use the VPN tunnel? Is there anything else I should keep in mind?

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• How do I locate the app generating this network traffic?

  - by Christopher Bartels

  I don't know what this process is doing on my computer. I run Windows 7 Professional w/ all its updates running current non-free antivirus. I only see it in Resource Monitor, where you can see the Network Service process connected to bitum.nnov.ru. When my PC's network traffic generating apps are idle, this process is using the most of all the idle processes using the network. Screenshot hosted here: http://sss.proinbox.com/bitum-nnov-ru.jpg Does anyone recognize this? The page source mentions a control port & a stream port: Page Source for http://bitum.nnov.ru : <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>DVR WebViewer</title> <meta http-equiv="Content-Type" content="text/html; charset=euc-kr"> </head> <body topmargin="0" leftmargin="0"> <OBJECT classid="clsid:EE479A40-C128-40DD-93DA-000556AF9607" codebase="CtrWeb.cab#version=1,0,2,2" width=875 height=585 align=center hspace=0 vspace=0 > <param name="CmdPort" value="5920"> <param name="StreamPort" value="5921"> </body> </html> When I google this page's title, I see a number of other domains that host the same page. Whois: domain: NNOV.RU nserver: ns.kis.ru. nserver: ns.nnov.ru. 78.25.80.210 nserver: ns1.kis.ru. nserver: ns2.kis.ru. state: REGISTERED, DELEGATED, VERIFIED org: "Agentstvo Delovoj Svjazi", Ltd registrar: RU-CENTER-REG-RIPN admin-contact: https://www.nic.ru/whois created: 1996.10.23 paid-till: 2012.11.01 free-date: 2012.12.02 source: TCI Last updated on 2012.06.16 04:20:46 MSK

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• How do I get more information on a potential network freeloader?

  - by Dov

  I have a home network set up, complete with a relatively good password. I'm in Mac OS X 10.6 (Snow Leopard) and have been noticing, on occasion, a computer showing up in my Finder's Shared section, that is not one of my own (the "pe-xpjalle" box pictured below). He has a tendency to come and go. How can I figure out his MAC address or something, so I can block him? I checked my "Logs and Statistics" in the Airport Utility, and didn't see that computer under DHCP clients. I'd rather not change my password, since I have quite a few devices I'd have to update. Is there any other reason he's show up on my network besides having guessed my password? Update: I fixed the Dropbox URL above (how embarrassing, I'm new to Dropbox. Thanks for the heads up, Doug.) Update 2: I tried clicking on "Connect as..." just for the hell of it, and got the dialog below. Now I have even less an idea what's going on than before. I don't have Parallels of VMware running, just the following: Transmission, NetNewsWire, Mail, Things, Safari, iTunes, Photoshop, Pages, Yojimbo, Preferences, AppleScript Editor, Software Update, Airport Utility, and Terminal. I don't think any of those create a virtual network machine, right? And no VMware machine of mine has ever had a name resembling "pe-xpjalle". Update 3: I just changed my passwords on both my N- and G-only networks, and I'm still seeing this, so I highly doubt that it's someone who's figured out my password (twice now). I'm really stumped.

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• Why would Windows use slower network interface despite route metrics?

  - by tim11g

  On my previous notebook, the Dell/Broadcom wireless adapter had an option to automatically disable wireless when a wired network is connected, so I never dealt with multiple active interfaces. My current system has an Intel wireless adapter, and they apparently haven't figured out how to turn it off when there is a wired connection. Unless I explicitly remember to disable wireless when docked, the connection is active. That shouldn't be a problem (in theory), since the route metric will cause traffic to go over the fastest network (as indicated by the lowest metric in the routing table). Apparently not - I'm running a backup and seeing the throughput at 25Mbps or so (which is consistent with 802.11g) when a perfectly good Gigabit Ethernet interface is also connected. IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.104 10 0.0.0.0 0.0.0.0 192.168.1.254 192.168.1.109 25 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 Windows has correctly identified the Ethernet interface (.104) and assigned it the lower (preferred) metric. So the Ethernet interface should be used exclusively, right? Why is the Ethernet connection not being used? What other factors are involved? (This is with Windows 7 if it makes a difference)

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• Advice needed for a home network setup (hardware & software) to handle many clients and potentially heavy traffic

  - by posdef

  I have recently decided to re-structure the home network of our flatshare here. Here's a quick outline of the situation. I envision to have the following 4 devices connected to the router via cable: Xbox 360 IP phone Printer QNAP server (Web, File and Multimedia) We are three people living here, so on top of that there will be to 5-6 computers/mobile devices connecting as wireless clients. My goal is to be able to transfer files (when needed) between the computer and the Multimedia server, which I can reach via 360 and play on the TV. I also would like to keep a high level of security; right now I have the encryption on WPA2 and MAC filtering. I don't believe the web server will get heavy traffic, though I would like to have it responsive. Likewise, I don't have a habit of downloading via torrent etc, but I greatly appreciate my network being responsive and fast, especially when I am browsing or streaming high quality media. Now my questions are: is this setup feasible? smart? efficient? can this be improved somehow? my current router (D-Link DI624) and the previous one (DI-524) used to have spontaneous drops in network, which I find highly irritating. I don't believe in my router, especially now that it completely crashed when I was test-running the setup by transferring a large media file to server while xbox was playing music from the server, and two computers browsing the net. Do I need to get new hardware, if so, any recommendations for a reliable and fast router?

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• Setting up shared connection

  - by Calvin Froedge

  I have a network that is connected to the internet via a switch connected to a router. I have it setup like this so I can work on the new network without causing problems on the old. Anyway, I'm trying to enable internet connection sharing. Internet comes to server like this: Modem - Router - Switch - Ubuntu 11.10 (Eth0) I want to share the connection through Eth1 (Eth1 - Managed Switch - Clients). Here is my config for /etc/network/interfaces: I have a DHCP server running on Eth1. Here is my config: ddns-update-style none; option domain-name "myserver.local"; option domain-name-servers 192.168.1.2, 8.8.8.8; default-lease-time 600; max-lease-time 7200; authoritative; subnet 192.168.1.0 netmask 255.255.255.0 { interface eth1; range 192.168.1.3 192.168.1.254; option routers 192.168.1.1; option subnet-mask 255.255.255.0; option broadcast-address 192.168.1.255; } Here is /etc/network/interfaces: # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet dhcp #Used for internal network auto eth1 iface eth1 inet static address 192.168.1.2 netmask 255.255.255.0 broadcast 192.168.1.255 network 192.168.1.0 Here is /etc/hosts: 127.0.0.1 localhost 127.0.1.1 myserver.isp.com server 192.168.1.2 server.myserver.local server myserver.local In /etc/sysctl.conf, I've set the following: net.ipv4.ip_forward=1 Finally, in /etc/rc.local, I've set the following: /sbin/iptables -P FORWARD ACCEPT /sbin/iptables --table nat -A POSTROUTING -o eth1 -j MASQUERADE When I ping 8.8.8.8 (google's DNS) from a client that is authenticated with my DHCP server (they have been assigned a local ip, like 192.168.1.10), I get a timeout. How can I debug this further to figure out where my problem is?

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• Configuring Windows 2003 As A Router

  - by Sean M

  I am trying to configure a Windows 2003 server to act as a router, so that the two subnetworks that I'm dealing with can communicate with one another without NAT. I am mostly sure that I have configured Windows 2003 incorrectly, and I'm finding it very difficult to drill down through Google results to something helpful. I have a 192.168.1.0/24 network that is my "production" network (in the sense that I'm in trouble if I screw it up) and a 10.0.0.0/8 network that is my test network. The 192.168.1.0 network is ruled by a gateway whose routing table looks like this (my address redacted): The Windows 2003 server, "prime," is multihomed. Its network adapters are at 192.168.1.122, (as seen above), 10.0.0.1, and 10.0.0.2. I added the Routing and Remote Access role to it, and enabled LAN routing. I do not have it using RIP or other routing protocols. Its current routing table is shown below. To me, it looks like all of the right routes are there for traffic to pass between the 192.168.1.0 network and the 10.0.0.0 network. However, traffic does not pass. The 10.0.0.11 and .12 clients cannot be contacted from the 192.168.1.0 network. When I use traceroute to try to get to them, the trace gets to the Windows 2003 server's 192.168.1.122 address, then produces nothing but "* * *" timeouts. When I try to traceroute to 192.168.1.1 from a 10.0.0.0-network client, I get "destination host unreachable." However, I know that the routing is working at least a little, because from the 192.168.1.0 network, I can connect to the Windows server just fine by referring to it as 10.0.0.1. What static routes would allow me to contact 10.0.0.11 and .12 from the 192.168.1.0 network? Is it possible to tell the Windows server "since you are a DHCP/DNS server, you already know routes to get to machines that are getting IP addresses from you, please add those to your routing table" ? Will using RIP or OSPF on the Windows server actually be helpful in this situation?

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• Advice for programming a lobby for a network multiplayer game?

  - by Milo

  I'm working on learning network programming. I'm working on a simple card game. The basic idea is: Players enter the lobby Players see tables Players sit at an empty seat Once they sit, they do not need any information from the lobby, they see the card table and the data about the other players and so forth. I've programmed the server portion for the game itself. The clients connect to my server object and the server then receives and sends messages; quite simple. The tricky concepts for me are: What's a good way to run many tables at the same time? What's a good way to keep the lobby consistently updated for each person in the lobby (eg: MSG_TABLE_FILLED, 22) Ideally I'd like to have 1 server exe for all of this and to have to deal with multithreading as little as possible. I'm going to use the enet library. I was thinking that each time a game session starts, I push a new Game and I map the client IPs to that table, then I just route messages from those clients to that Game. Since enet supports channels I was thinking of using 2 channels per table, one for the game messages and one for in game chat. Would something like this work? Does anyone have any advice / design ideas for a game with a lobby and many tables? Is there a usual way this is done that I'm overlooking? Any conceptual ideas or even c/c++ code examples would be very helpful. Thanks

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• What can I do about rsync of large files killing my laptop's wifi connection

  - by David Dean

  When I run a rsync to backup my home folder over the network like so: rsync -avhz --progress --delete /home/dbdean/ [email protected]:/home/backups/david/ I seem to have problems with my quite large .VirtualBox/HardDisks/Windows XP.vdi file. Occasionally the wifi will silently fail (the transfer stops, and any other network access is broken). If I reconnect the wifi to my network before the transfer times out, it happily keeps going (and other network access is back), but I can't just leave it unattended most of the time, as I have to keep an eye on it. I'm guessing this is probably a bug in the wireless card related to a particularly high sustained volume of network usage, but I'm not really sure where to start with diagnosing this problem so that I can provide a good bug report. Or it could be something else, I guess. Any help would be appreciated. My network card is an Atheros Communications Inc. AR9285, as lspci -k shows: 43:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01) Subsystem: Hewlett-Packard Company Device 3040 Kernel driver in use: ath9k Kernel modules: ath9k

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