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• D-Link DWA-125 constantly disconnecting in winXP, but works fine on ubuntu..

  - by sil3nt

  Hey there, I'm dual booting winXp and ubuntu 10.10. I'm using a DWA-125 usb adapter to connect to my home wifi connection and I'm having this odd issue. First off, in ubuntu the adapter works fine and I have no trouble at all, but when I boot back in XP I get a dlink connetion wizard and the connection times out after every 2 minutes. It's odd because I can actually load up web pages and use the internet for 2 minutes, and then it would disconnect and the whole thing would repeat. I did a system restore on xp and this stopped the whole connect-disconnect thing but once I booted into ubuntu and came back to xp it started all over again!(?). Any ideas as to how I would go about fixing this?

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• How many servers do I need to run my social network

  - by user38141

  I am trying to build a social network and I am wondering how many servers I would need to handle 100,000 to 500,000 users.

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• Server hard disk read speed and client download speed, is there a connection? [closed]

  - by Mywiki Witwiki

  Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two computers is only as fast as the speed of the "bottleneck". Let's pretend the two computers are in two different networks and both have 100Mbps internet connection. Ben wants a copy of a file in Mark's computer hard disk with 30Mbps read speed. Does this mean that Ben can download the file at a speed of around 30Mbps only, despite having an internet connection faster than 30Mbps?

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• Block P2P traffic on a Linksys router WRT54G with Tomato firmware

  - by Kami

  I'm running a small wireless network (6 to 10 users) on a Linksys WRT54G with Tomato firmware sharing an Internet connection. I don't want the users to download files with BitTorrent (mainly used) and other P2P apps. I've also found some solutions about lowering P2P traffic priority using QoS. I really need to ban P2P traffic. Does anyone know how to setup some rules to deny that kind of traffic? I've tried to setup an Access Restriction Rule: However it's not working at all.

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• With CentOS 6 and LXC, "ifconfig" is unable to see network interface (but busybox "ifconfig" works fine)

  - by larsks

  I've just started working with LXC under CentOS 6 (via the libvirt adapter). If I create an LXC container, I'm unable to see any network interfaces when using the native system tools: # ifconfig -a # The behavior is very odd; specifying an interface by names yields neither the expected output nor an error message. This is true even for clearly invalid interface names, like this: # ifconfig foo # The ip command exhibits the same behavior. On the other hand, if I use "ifconfig" provided by busybox, everything works as expected: # busybox ifconfig -a eth0 Link encap:Ethernet HWaddr 52:54:00:E0:12:C8 inet6 addr: fe80::5054:ff:fee0:12c8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:268 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:17814 (17.3 KiB) TX bytes:552 (552.0 B) 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) So...what does busybox know that the native tools don't? The libvirt config for this environment is pretty standard; the network definition looks like this: <interface type='network'> <mac address='52:54:00:e0:12:c8'/> <source network='default'/> <target dev='veth0'/> </interface> The full configuration is here if you think it might help. I'm running: lxc-0.7.2-2.el6.x86_64 kernel-2.6.32-71.29.1.el6.x86_64 EDIT Weirder and weirder...it's a display issue, not a functionality issue. I can see the output of ifconfig if I pipe it into anything, so for example: # ifconfig eth0 | cat eth0 Link encap:Ethernet HWaddr 52:54:00:E0:12:C8 inet addr:192.168.10.10 Bcast:192.168.10.255 Mask:255.255.255.0 inet6 addr: fe80::5054:ff:fee0:12c8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:573 errors:0 dropped:0 overruns:0 frame:0 TX packets:6 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:37914 (37.0 KiB) TX bytes:552 (552.0 b) And in fact even when not piping the output, strace shows that ifconfig is in fact writing the output to file descriptor 1 (aka stdout), so it's not clear why no output is actually showing up. This could be either an LXC or a virsh issue, I guess.

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• Wireless vs. Wired: which is faster?

  - by studiohack

  I have the option of hooking up my machines to the internet either wirelessly or via ethernet cable (wired). I'm curious as to which is faster; the approximate wireless signal strength (average) is about 60%. My question is, would my internet be faster if I used ethernet, resulting in a stronger connection?

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• Do all the network cards use the same frequency to send signals to wire?

  - by smwikipedia

  I am comparing my cable TV wire to my network wire. In a TV cable wire, different frequencies are used by different TV channels. And since a certain channel use a fixed frequency, I think the only left way to represent different signal is with the carrier wave's amplitude. But what about the network wire? For all the network cards with the same type, do they also use different frequencies to send signals just like TV cable? I vaguely remember that they use frequency adjustment to represent signals. So the frequency should not be a fixed one. So how did all the network cards that sharing the same medium differentiate their own signal from others?

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• Trixbox CentOS Default GW Problem (Multi-homed server)

  - by slashp

  I'm having an issue with a CentOS trixbox server which is dual-homed (one private facing NIC [eth1], one internet-facing NIC [eth0]). I can't seem to get the default gateway to set properly to our ISP's GW via eth0. I've modified the /etc/sysconfig/network to contain both a GATEWAY & GATEWAYDEV line and removed the GATEWAY line from /etc/sysconfig/network-scripts/ifcfg-eth1 (as well as /etc/sysconfig/network-scripts/ifcfg-eth0). No default GW shows up in the routing table unless it's specified in the ifcfg-eth1 file (which both the wrong interface and wrong gateway IP), otherwise, the routing table simply does not contain a default gateway..any ideas would be greatly appreciated! Thanks! EDIT Just realized when attempting to add the default gateway manually using the route add command, I receive an error stating: SIOCADDRT: Network is unreachable I know this error can occur when your default gateway and interface IP address are not on the same subnet..in this case, my public IP address of eth0 is a /29.

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• Enabling NAT loopback on HG556a router?

  - by galdikas

  This is one of the standard issue vodafone routers. So i set up web-server on my laptop, and it is accessible to the internet now. However I need to be able to access it from my machine using the public address. But I just cannot find where to enable nat loopback. I looked for options in both regular and advanced user logins (web interfaces). So I suppose the last option is telneting into it, and using commands to do it.. but I don't know how to access it (cant find the credentials). http://rhiggins.sdf-eu.org/blog/index.php?entry=entry110722-164625 In above link it says that i can find this info in configuration file, but anyone could tell me how to access it? And then what commands should I use to enable the NAT loopback?

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• i am not able to connect to the application hosted on port 80

  - by shiva

  I am trying to access an application that is hosted on port 80. When i try the url from my personal computer , the site is not reachable but the same url on the server( which hosts the application) i am able to access the site. When i disable the firewall then i am able to access the site from my pc. So there is some rule which is blocking this port. How do i determine what windows firewall rule is blocking this port. I have disables IIS as well. Kindly point me in the right direction

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• How to configure 2 LAN Cards

  - by PatDiazJr

  How do we configure two (2) LAN cards on one computer. One LAN card is connected to the internet via the DSL through a router, configured as DHCP. The other LAN card is to be connected via our office's IP/VPN (for email and other office online processes). I know it could be done, but I do not know how. By the way, the operating system is Windows XP.

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• Setting up a network where packets are traced

  - by Marcus

  My situation is the following: I have an internet connection, which is shared between people. More or less obviously, people is using it to download illegal stuff. Since I'm the owner of the connection, I want to avoid being sued. I don't want to prevent the people from doing the things they want, but I want to be legally safe. Now, I have relatively little competences in network administration, so I was wondering: is it possible to setup a network, where the source and destination of the packets are logged? I would use this to prove, in case of lawsuit, that the traffic was coming from a given machine. if the idea is feasible, is there any wireless router on which I can install linux, where I can install the packet sniffer? how much space could the logs take (containing only the timestamp/source/destination), per GB of traffic? a very rough estimation would be very helpful. if a machine on my network is sending bittorrent packets to a certain IP, would this log be able to reflect the time, source ip and destination ip? I assume that obviously the torrent data would be encrypted and un-decryptable. Am I missing something? Is there a better strategy? Any pointer to documentation would be helpful as well - in that case, I would use this as starting point.

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• How can non-admins view which files are open on a file server?

  - by Josh

  I'm on a windows workstation, and I want a list of which files are open over the network on a windows server. The Shared Folders MMC Snap-in does this visually, and SysInternals' PSFile does it from the command line, but by default only for admins. I want to let regular users do this, too. What permissions do I need to grant them?

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• Anyone interested in obtaining a cable list from a visio Diagram? [closed]

  - by Alex

  it's my first post here. Just wondering if anyone had to deal with the following problem - you have to install over say a 100 network elements and servers - cabling is done via contractors, so you need to provide them with an accurate, error-free cable list - your inputs are a set of detailed, port by port, visio diagrams. Prb is to obtain the cable list and get the cabling started while you're busy crafting the switch/routers configs. I coded a Visio plugin, which I plan to release under the GNU license, that returns a cable list from a diagram, and tested it on intermediate size infrastructure, 2K+ cables. It works well. The tool needs a little work to be user friendly, so before getting started, I wanted to know if that was worth the effort. Questions are welcomed, let me know -A PS: the tool is targeted for those who need a port by port description of their network, in the form Source/slot/port/Destination/slot/port.

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• Home network with two isolated separate subnets, running on cablemodem/router and WRT-router.

  - by Johan Allgoth

  I have a new connection with a nice new router/cable-modem. I'd like to setup it up optimally and needs some pointers. I am a complete n00b when it comes to routing. I want to end up with two separate subnets, 10.1.2.0/24 and 192.168.1.0/24 each available on their own wireless channel/SSID. Both firewalled. I want my wired computers on the gigabit switch, optimally with public ips. I want to be able to reach 192.168.1.0/24 from 10.1.2.0/24, but not vice versa. Everyone should have internet access. Hardware and capabilities: Netgear CG3100. Handles cable connection. Gigabit switch. 802.11n. Can do DHCP, firewall, NAT etc. Can choose subnet. Can turn of NAT and if so hand out up to 4 public ips. Somewhat challenged when it comes to configuration. WRT-router. Runs DD/Open-WRT very stable. 100 Mbit switch. 802.11.g Can do DHCP, firewall, NAT etc. Can choose subnet. Highly configurable. I hope to be able to keep 10.1.2.0/24 on the CG3100, for speed reasons and 192.168.0.0/24 on the WRT-router for quota and user control reasons. On my 10.1.2.0/24 network I plan on running servers for various services. Should I turn of NAT on the WRT-router? Or on the cable modem? Activate what in that case? Is double NAT always f-ed up?

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• Netcat file transfer problem

  - by thepurplepixel

  I have two custom scripts I just wrote to facilitate transferring files between my VPS and my home server. They are both written in bash (short & sweet): To send: #!/bin/bash SENDFILE=$1 PORT=$2 HOST='<my house>' HOSTIP=`host $HOST | grep "has address" | cut --delimiter=" " -f 4` echo Transferring file \"$SENDFILE\" to $HOST \($HOSTIP\). tar -c "$SENDFILE" | pv -c -N tar -i 0.5 | lzma -z -c -6 | pv -c -N lzma -i 0.5 | nc -q 1 $HOSTIP $PORT echo Done. To receive: #!/bin/bash SERVER='<myserver>' SERVERIP=`host $SERVER | grep "has address" | cut --delimiter=" " -f 4` PORT=$1 echo Receiving file from $SERVER \($SERVERIP\) on port $PORT. nc -l $PORT | pv -c -N netcat -i 0.5 | lzma -d -c | pv -c -N lzma -i 0.5 | tar -xf - echo Done. The problem is that, for a very quick second, I see something flash along the lines of "Connection Refused" (before pv overwrites it), and no file is ever transferred. The port is forwarded through my router, and nmap confirms it: ~$ sudo nmap -sU -PN -p55515 -v <my house> Starting Nmap 5.00 ( http://nmap.org ) at 2010-04-21 18:10 EDT NSE: Loaded 0 scripts for scanning. Initiating Parallel DNS resolution of 1 host. at 18:10 Completed Parallel DNS resolution of 1 host. at 18:10, 0.00s elapsed Initiating UDP Scan at 18:10 Scanning 74.13.25.94 [1 port] Completed UDP Scan at 18:10, 2.02s elapsed (1 total ports) Host 74.13.25.94 is up. Interesting ports on 74.13.25.94: PORT STATE SERVICE 55515/udp open|filtered unknown Read data files from: /usr/share/nmap Nmap done: 1 IP address (1 host up) scanned in 2.08 seconds Raw packets sent: 2 (56B) | Rcvd: 5 (260B) Also, running netcat normally doesn't work either: squircle@summit:~$ netcat <my house> 55515 <my house> [<my IP>] 55515 (?) : Connection refused Both boxes are Ubuntu Karmic (9.10). The receiver has no firewall, and outbound traffic on that port is allowed on the sender. I have no idea what to troubleshoot next. Any ideas? P.S.: Feel free to move this to SO/SF if you feel it would fit better there.

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• Slow download speeds on MacBook Pro

  - by Austin

  Just as the title says, I am getting very low download speeds on my MacBook Pro. I did a speed test at speedtest.net, and am getting 7 MbPS down, .5 up. However, I can only seem to get 270 KB PS max (averaging 100 K), whether on my school's network or on my home network, wired or wireless. I am on Mac OS X 10.5.8, with Google Chrome. My ethernet settings (under System Preferences - Network - Ethernet Connection - Advanced - Ethernet) are set to "Configure Automatically", "Speed: 100TX", "Duplex: full-duplex, flow-control", and "MTU: Standard (1500)". As far as I can tell, there are no throttles or anything between here and the ISP, so... Any ideas on why I'm getting such low download speeds?

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• Windows 7 - system error 5 problem

  - by ianhobson

  My wife has just had a new computer for Christmas (with an upgrade from VISTA to Windows 7), and has joined the home network. We are using a mix of WindowsXP and Ubuntu boxes linked via a switch. We are all in the same workgroup. (No domain). Internet access, DHCP, and DNS server is an SME server that thinks it is domain controller (although we are not using a domain). I need to run a script to back up my wife's machine (venus). In the past the script creates a share on a machine with lots of space (leda), and then executes the line. PSEXEC \\venus -u admin -p adminpassword -c -f d:\Progs\snapshot.exe C: \\leda\Venus\C-drive.SNA With the wife's old XP machine, this would run the sysinternals utility, copy shapshot,exe to her machine and run it, which would then back up her C: drive to the share on leda. I cannot get this to work with Windows 7, nor can I link through to the C$ share on her machine. This gives me a permissions error (system error 5). The admin account is a full admin account. And yes - I do know the password. The ordinary shares on her machine work fine! I guess I'm missing something that Microsoft have built into Windows 7 - but what? The machine is running Windows 7 business, with windows firewall, AVG anti virus, and all the crap-ware you get with a new PC removed. Thanks

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• How to monitor the network traffic on a router?

  - by Adi

  Here's my current network set-up: we have 3 users connecting to a Thomson Gateway router (TG585 v8) provided by my ISP. We are connecting over an ADSL line. The problem is that we have a limited data allowance (60GB) and we always exceed it. I would like to monitor how much traffic each computer makes. The best solution would be to install a software on the router (like OpenWRT) which would monitor how much traffic each computer makes. But I couldn't find any replacement firmware that would support my router. The other solution would be to install a software on each machine and then collect all the data at the end of the mount. But that's not a very good think to do. Plus, the users can always shut down the application. Any suggestions?

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• Why is my connection slow?

  - by Jay R.

  I have a Dell Precision T5400 with a Broadcom 1Gb onboard NIC. For some strange reason, when I access machines on our local network, the best I can get is around 125KB/s download speed. My laptop that has a 10/100Mb NIC onboard usually gets around 300KB/s or better from the same network resource. Both machines are plugged into the same 1Gb switch which connects to our local network wall jack at 100Mb half duplex. There is also a printer plugged into the same switch at 100Mb full. The resource I'm using for the test is a 30MB zip file copied from a jetty webserver that is running as part of a cruisecontrol installation. The cruisecontrol installation is running WindowsXP with full real-time antivirus and Altiris patch management and inventory running. That stuff on its own is eating some of the download speed. I've seen the laptop reach into the multiple MB/s download speed before, but the desktop never seems to get past 125KB/s to 130KB/s. In WindowsXP, before I upgraded the driver in the desktop, it was that slow. In Fedora, it is still slow even though it appears to be using the same driver version as the upgraded Windows driver. The upgraded Windows driver is faster, but still not nearly as fast as the laptop. What gives? Any insight to improve the situation would be appreciated. Could it be that the BroadCom board just isn't that good, or the driver in linux is just not as good as the Windows one?

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• How do I wire a crossover cable to connect two devices together?

  - by Axxmasterr

  I need to make a ethernet crossover cable to connect two devices together. Anyone know the process to make one from scratch?

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• Accessing local resources over wifi with a BES-connected Blackberry

  - by bshacklett

  I'm trying to get to a local web site on my LAN at 192.168.1.10 with my Blackberry, but I'm getting a message saying the server did not respond. I know that some, if not all, internet traffic on a BES-connected blackberry goes through the BES. This is clear because I can access internal resources on my employers network via the mobile network. Is there any way for me to specify that the device should attempt to route directly over wifi before it tries to connect via the BES server at work?

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• How to set up a wireless AP with a linux box and SOCKS proxy

  - by user50455

  I've got: (1) Linux box (Arch linux to be precise, but that doesn't really matter) (2) Ethernet connection on it (say, eth0) (3) Socks proxy on a remote site (say, remote :port), which can be accessed through (2) (4) Wireless card on local linux box (say, eth1) So, the task is: create a wireless access point using (4) on local site (1) in such a way that all connections from it will go through proxy (3). E.g., when one simply connects to that AP (well, there should be DHCP or something for that) and goes to serverfault.com, all the traffic goes through that SOCKS proxy. I'm just asking for the digging direction and some references, not step-by-step tutorial. Thanks in advance

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• How to selectively route network traffic through VPN on Mac OS X Leopard?

  - by newtonapple

  I don't want to send all my network traffic down to VPN when I'm connected to my company's network (via VPN) from home. For example, when I'm working from home, I would like to be able to backup my all files to the Time Capsule at home and still be able to access the company's internal network. I'm using Leopard's built-in VPN client. I've tried unchecking "Send all traffic over VPN connection." If I do that I will lose access to my company's internal websites be it via curl or the web browser (though internal IPs are still reachable). It'd be ideal if I can selectively choose a set of IPs or domains to be routed through VPN and keep the rest on my own network. Is this achievable with Leopard's built-in VPN client? If you have any software recommendations, I'd like to hear them as well.

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• DNS and IPs - Does DNS send the IP back to the client?

  - by Josh

  I ran across a site that talked about routing all cients requesting by IP to a "dead end." The clients accessing the site via ip it claimed were typically automated exploit tools and bots. Legitimate users type in the web address by it's domain question. With this context in mind, I don't really understand how DNS really works. I thought it worked by sending an IP back to a client for the requested DNS (like a phone book.) The client then uses the IP to access the site. The information above seems to indicate I misunderstand this. Can someone clarify this? (http://technet.microsoft.com/en-us/magazine/2005.01.hackerbasher.aspx)

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