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• How can I force certain applications to use specific network connections?

  - by snicker

  Let's say I have two active network connections that let me out to the internet. I want certain applications to only use Network Connection 1, while some others should use Network Connection 2. Is this possible in Windows XP? If so, how can it be done?

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• Windows 7, network transmit (send) not working

  - by user326287

  My Win 7 works 2 years without problem. But now, I can't transmit (send) big data on LAN/Internet. I can: - Ping anything - Browse Internet, download files at full speed - Send e-mails with very small attachments. - Testing download speed on Speedtest.net, measure stable full speed. I can't: - Testing upload speed on Speedtest.net. Upload stuck.. - Save/send email messages with big (128k) attachment, independent from e-mail provider or e-mail box. THIS IS NOT A HARDWARE/CABLE/CARD OR OTHER NETWORK DEVICES PROBLEM! When I boot from a Linux Live CD, without ANY hardware change, all data sending, testing works correctly, at full speed. I have tried already in Win 7: - Disable Windows/3rd party Firewall completely - Reset IP stack parameters (netsh int ip reset c:\resetlog.txt) - Computer restore - Reinstall LAN driver When I inspect the packets in Wireshark in Windows, I see lot's of (maybe 60% of sent packets) "TCP Retransmission". Sometimes receive "TCP Dup Ack" or "TCP Out-of-Order". Linux don't do this. Thank you for the help.

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• iptables, forward traffic for ip not active on the host itself

  - by gucki

  I have kvm guest which's netword card is conntected to the host using a tap device. The tap device is part of a bridge on the host together with eth0 so it can access the public network. So far everything works, the guest can access the public network and it can be accessed from the public network. Now the kvm process on the host provides a vnc server for the guest which listens on 127.0.0.1:5901 on the host. Is there any way to make this vnc server accessible by the ip address which the guest is using (ex. 192.168.0.249), without interrupting the guest from using the same ip (port 5901 is not used by the guest)? It should also work when the guest is not using any ip address at all. So basically I just want to fake IP xx is on the host and only answer/ forward traffic to port 5901 to the host itself. I tried using this NAT rule on the host, but it doesn't work. Ip forwarding is enabled at the host. iptables -t nat -A PREROUTING -p tcp --dst 192.168.0.249 --dport 5901 -j DNAT --to-destination 127.0.0.1:5901 I assume this is because the IP 192.168.0.249 is not not bound to any interfaces and so no ARP requests for it get answered and so no packets for this IP arrive at the host. How can make it work? :)

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• Device that connects to a switch via RJ45, that emulates a PC

  - by Mike Christiansen

  One of my co-workers once saw a device that plugged into a RJ45 jack, that emulated a PC. It could be configured with an IP address, and respond to pings. I was wondering if anyone knew about these, or even what they are called? This will be used to simulate a PC in a classroom environment. Thanks in advance. Edit: This is a CCNA classroom, we are looking to simulate a PC connected to an ethernet port on a router. These will be on different subnets, etc. This might be doable with a VM through VLANs and virtual switches, but then we are getting away from configuring the physical ports on the router the way we want to.

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• DHCP server can't see other machines

  - by William

  Hi, I setup a private network from virtual machines and one of the machines is the DHCP server for the group. I want to specify a next-server for the DHCP server but I'm having trouble connecting to any of the machines that I lease IPs to. I'm just trying to do a simple ping/ssh to 10.0.0.252 (a machine with a lease) but it doesn't seem to respond. Any advice? I'm assuming I need to be able to connect to my next-server but maybe I'm wrong. Thanks.

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• Stopped windows firewall service during ICS, how is this possible?

  - by insipid

  Although windows firewall is required to be on when you "start" Internet Connection Sharing, you can stop the WF service with MMC. When done a client can still use the host machines internet. The firewall had port 80/http blocked, and now it is open for incoming traffic. However other ports used by applications on the host and client which communicate with each other still seem to be blocked. Can anybody explain what might be happening here? Doesn't ICS need windows firewall for NAT? Note: I am not actually seeing anything in the firewall logs after stopping the service, but even packets sent localhost on the host machine never arriving on these other random ports.

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• Access server by hostname without domain

  - by projectshave

  I want to access services on other machines on my home network with just their hostname. In every browser, "http://machine" fails, but adding a period in "http://machine./" works. Is there a way to avoid adding that extra period? My setup is a router with DD-WRT w/ DNSmasq turned on, Win7 machines and several Ubuntu VMs. nslookup works fine with just hostname. Remote desktop works, but TightVNC needs the extra period. ssh needs the period. As I said, all my browsers need the extra period. I'd prefer a solution that doesn't require manually maintaining the hosts file. Thanks.

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• CSMA between APs in same channel & different SSID ?

  - by Ranganathan

  Would be great if someone clarifies this doubt. Lets assume two Wireless Access Points AP1 & AP2 with these conditions 1. both in the same 802.11 standard 2. same channel 3. using different SSIDs (just like in adjacent apartment houses). In this case, do these two Access points (and the clients associated to them) coordinate via CSMA/CA ? ie., if one of the AP's or a client station is about to transmit, does it wait & observe the other AP's & its clients' transmission before sending the frame in air ? Also, do the clients associated with these different APs coordinate via CSMA/CA ?

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• Using a second Wifi Router (in order to use a LAN port)

  - by Sledge81

  Problem: Connecting a TV decoder via Internet. It doesn't have inbuilt wifi so wired LAN is the only option. I bought a second Wifi Router so I could use its LAN port to create a wired internet connection to my decoder. What I want to achieve: The second Wifi Router should basically pick up the signal from the main wifi router. I would then use the LAN port to connect (with a wire) to the TV decoder. In other words have my secondary Wifi Router act as an access point, which will enable me to use a wired LAN connection to the decoder. What i've done so far: Connected the second Wifi Router to my laptop via the LAN ports. Access 192.168.1.1 and went into my second router. 1) SSID set to the same one as the main Wifi Router 2) Tried disabling DHCP and enabling DHCP (with the DNS and default gateway configured the same as the main router). When I check my network connections, I see the LAN connection too but it says 'Not connected to the internet' while the Wifi (main router) shows connected. Can someone please advise on how to use my second Wifi Router to connect to the main Wifi Router (and thus the Internet). Thanks. main wifi router: Zyxel secondary wifi router: TP Link

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• Why is iTunes using so much data?

  - by George

  I've been told by my ISP I'm using too much bandwidth so after using Activity Monitor to see that I'm using ~2GB a day I've used the nettop command line utility to work out where. Turns out it's iTunes. I don't use it for downloading/streaming music (other than podcasts of which I definitely don't have 2GB of new ones a day) or movies. What is iTunes doing? This is on a late 2009 MacBook running Lion 10.7.5 with iTunes version 10.7

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• IPv6 feature in Network Adaptor is Slowing Internet

  - by Teknophilia

  The past few days, my internet browsing has become very poor. It's not a matter of speed, as a speed test will give at least 15Mbps. It seems as if my laptop has a hard time actually connecting to the sites. I've found a possible culprit, but don't know why it would affect anything: Going to adapter settings and disabling ipv6, but leaving ipv4, my browsing is back to normal. Re-enabling ipv6 brings back the issue. This is strange though, because I have always had ipv6 enabled. Moreover, using sites to test ipv6 compatibility, I fail with ipv6 enabled on my adapter, and pass when it's disabled. Ideas about why this is happening, and how to fix it?

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• Applications getting killed automatically

  - by nebi

  I am running httperf client on my m/c and after few seconds it is getting killed. dmesg shows: The command is: httperf --hog --client=0/1 --server=39.0.0.2 --port=80 --uri=/50kb --rate=20000 --send-buffer=4096 --recv-buffer=16384 --num-conns=6000000 --num-calls=1 Although I had done this test no. of times but never faced this error any time. From last two days I am observing this. My Ubuntu version is ubuntu 10.04. and httperf version is httperf-0.9.0 [ 2997.180620] Out of memory: kill process 7977 (apache2) score 70532 or a child [ 2997.180632] Killed process 7977 (apache2) [ 2997.184837] Out of memory: kill process 7971 (rsyslogd) score 8702 or a child [ 2997.184844] Killed process 7971 (rsyslogd) [ 2997.188823] Out of memory: kill process 7978 (apache2) score 1354 or a child [ 2997.188829] Killed process 7978 (apache2) [ 2997.192817] Out of memory: kill process 7973 (atd) score 561 or a child [ 2997.192822] Killed process 7973 (atd) [ 2997.196805] Out of memory: kill process 8102 (httperf) score 471 or a child [ 2997.196811] Killed process 8102 (httperf) Output of free command: total used free shared buffers cached Mem: 3862768 163000 3699768 0 2384 13068 -/+ buffers/cache: 147548 3715220 Swap: 3905528 0 3905528

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• Combine multiple network interfaces to connect to a dedicated server

  - by Dženis Macanovic

  this is an underpaid employee writing, who's apparently responsible for all the IT stuff in a very small (non-IT) company. Today said company got a bunch of PCs/workstations, a switch, a computer that's supposed to be used as a router, two DSL connections (each 16 MBit/s downstream and 1 MBit/s upstream) and a dedicated server which is hosted and managed professionally by a larger local company with some decent connection speed (1 GBit/s both directions if I'm not mistaken). This is what I've set up (note I'm not making use of the second DSL connection at all)... ETH0 ETH1 [ SWITCH ]---[LINUX DEBIAN ROUTER]---[DSL MODEM 1]---[INTERNET] | | | PC1 | | PC2 | ... ... when my boss asked me, if it was somehow possible to get 32 MBit/s downstream and 2 MBit/s upstream. At that time I replied "no" without thinking too much about it. Now I've just had the following idea... ETH1 ETH0 ETH0 ,---[DSL MODEM 1 (NON-STATIC IP)]---, ,---, ETH0 [ SWITCH ]---[LINUX DEBIAN ROUTER] [INTERNET] [LINUX DEBIAN SERVER]---[INTERNET] | | | '---[ DSL MODEM 2 (STATIC IP) ]---' '---' PC1 | | ETH2 ETH0 PC2 | ... ... but I have absolutely no clue how to implement that. Would that even be possible? What would the masquerading rules look like on the router? What about the server? I didn't find anything on the internet, mainly because I couldn't come up with any good keywords to search for to begin with. English obviously isn't my first language. Thanks in advance for your time!

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• Cannot enable wireless Ubuntu 10.04

  - by woaddoa

  I have recently installed Ubuntu 10.04, however I am having trouble getting wireless to work. Ubuntu says that wireless is disabled, and I am unable to enable it. I have tried Administration Hardware Drivers however the only drivers listed are Nivida graphics ones. I am unsure what to do as I do not think the process is the same as searching for drivers for a windows machine. Any advice appreciated.

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• Windows 7 Built-In VPN - How to access network shares, printers, etc.?

  - by mbrion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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• LMDE detects a wireless card, but can't use it

  - by Davidos

  LMDE can see my wireless card, and correctly identifies it, but it refuses to let me turn it on through the shiny graphical interface. Is there a way to use the non-shiny terminal to turn on my wireless? One small tidbit I noticed was the stated version; it says the version is 00. I believe that's hexadecimal for 0, which may indicate something screwy with the software. It would be nice if someone could tell me how to figure out how to solve this kind of problem in the future. *-network DISABLED description: Wireless interface product: Centrino Wireless-N 1000 vendor: Intel Corporation physical id: 0 bus info: pci@0000:09:00.0 logical name: wlan0 version: 00 serial: 91:e3:7b:0d:a3:a9 width: 64 bits clock: 33MHz capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless configuration: broadcast=yes driver=iwlagn driverversion=3.0.0-1-amd64 firmware=39.31.5.1 build 35138 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn resources: irq:43 memory:e1d00000-e1d01fff I've tested multiple other network managers, and none of them work. W ireless switch is on, I'm sure it's a driver problem.

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• How to forward traffic using iptables rules?

  - by ProbablePattern

  I am new to iptables and I have been doing Google searches for a few days now without finding a good solution to this problem. I have computer A with a public ip address (say 192.0.2.1) that can access the Internet unrestricted. I have another computer B with a private ip address (192.168.1.1) that can only access computer A. How do I use iptables to forward network traffic from B through A to the Internet? I need to use http, ftp, and https in order to use apt-get with sudo. Both computers run Ubuntu linux. I have tried using Squid but I think it is far too complicated for what I need to do.

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• How to use OpenVPN through a restrictive firewall?

  - by R.L. Stine

  I'm currently in the situation of attempting to setup OpenVPN on a personal VPS, for connection primarily through an overly restrictive firewall. All of the setups mentioned below work when used through a reasonably-firewalled connection. I have tried: OpenVPN running on the standard port OpenVPN running on port 443 (I start OpenVPN manually from the command line on the VPS and see that the server reports the connection being closed almost immediately, I assume this is a result of DPI on the firewall) STunnel running on port 443 to access OpenVPN and evade DPI. This is the most successful and allows a connection and internet access through the VPN for ~10-20 seconds, before the connection is forcibly closed. Is there anything else I can attempt?

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• how to build network across buildings ?

  - by Omie

  Hi ! I need some help in building a network between hundreds of computers spread across multiple buildings of my college. Yes, I'll be doing this as a part of my college project. Please see this image, it will give you enough idea of what I'm trying to achieve. http://i.imgur.com/rOohx.png All the computers in all buildings should be able to connect server. Once network is up, there will be a set of services over intranet and network use will be moderate. well, say there will be an email server and a http server. My point is, I cannot afford much of performance loss. It feels easy to connect computers inside 1 building to each other, however, I'm clueless as to how to connect all of them to server. I mean, just 1 cable won't be enough to connect 1 building to server, right ? How should I go with it ? I am not expecting detailed configuration. Just heads up will do :) Thanks

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• Cisco ASA 5505 network route for static IP hosts

  - by TheCapn

  I've configured my internal VLAN using the most basic settings where ports 1-7 are assigned from a pool of addresses in the range 192.168.15.5 - 192.168.15.36. These hosts are given access to the internet and it works great. What I'm trying to set up now is allowing users who are connected to the device and specify their IP (say I connect and request 192.168.15.45) are given internet access and can still work alongside DHCP hosts. Those with a DHCP assigned address are blocked from the internet. Mostly the issue resides in that I am very new to working with the device. I feel that the solution is easy but I'm not looking in the right spots and don't have the correct terminology down to google it. Do I need to define access control lists? Group policies? a new VLAN? The rules that are set up seem to be specific to the entire /24 subnet but when I request a static IP outside of the DHCP range I get blocked from other hosts and the internet.

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• What does VNC reflectors basically do?

  - by honeybadger

  I am confused about what vnc reflector does. From the documentation http://sourceforge.net/projects/vnc-reflector/ I got that it's proxysitting between real VNC server (a host) and a number of VNC clients. My confusion is : 1. Does it make any changes to the coming stream from server 2. Does it make 1 connection with server to connect to many client or the connections are proportionate. Documentation is not clear in this. If anyone can help me?

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• Suggestions for transitioning to new GW/private network

  - by Quinten

  I am replacing a private T1 link with a new firewall device with an ipsec tunnel for a branch office. I am trying to figure out the right way to transition folks at the new site over to the new connection, so that they default to using the much faster tunnel. Existing network: 192.168.254.0/24, gw 192.168.254.253 (Cisco router plugged in to private t1) Test network I have been using with ipsec tunnel: 192.168.1.0/24, gw 192.168.1.1 (pfsense fw plugged in to public internet), also plugged in to same switch as the old network. There are probably ~20-30 network devices in the existing subnet, about 5 with static IPs. The remote endpoint is already the firewall--I can't set up redundant links to the existing subnet. In other words, as soon as I change the tunnel configuration to point to 192.168.254.0/24, all devices in the existing subnet will stop working because they point to the wrong gateway. I'd like some ability to do this slowly--such that I can move over a few clients and verify the stability of the new link before moving critical services or less tolerant users over. What's the right way to do this? Change the netmask on all of the devices to /16, and update gateway to point to the new device? Could this cause any problems? Also, how should I handle DNS? The pfsense box is not aware of my Active Directory environment. But if I change DNS to use the local servers, it will result in a huge slowdown as DNS queries will still be routed over the private t1. I need some help coming up with a plan that's not too disruptive but will really let me thoroughly test the stability of the IPSEC tunnel before I make the final switch. The AD version is 2008R2, as are the servers. Workstations are mostly Windows XP SP3. I have not configured the 192.168.1.0/24 as a site in AD sites and services.

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• How do I connect my Windows XP laptop to the internet?

  - by rubysiddhi

  Hello fellow super users, The Past I have a Acer Travelmate 2300 laptop running Windows XP. 6 months ago I moved into a new apartment and got a new internet connection set up. After getting an internet connection installed in my apartment I reinstalled Windows XP and at the same time wiped my drive clean losing all the original Acer software and drivers. Once XP was reinstalled I had to find all the drivers again to get the Travelmate laptop connected to the internet. So, using my Vista laptop which was connected fine, I went to the Acer Travelmate Series drivers download page to download the necessary drivers. I transferred them to my Acer XP machine and installed them the best I could (there were no easy instructions so I just had to find all the executables and run them). I eventually got connected to the internet but not exactly in the way I had hoped for. The Present To be connected to the internet I need to have an Ethernet cord connecting my computer (via the Ethernet port) to my router. This is a problem since it defeats the purpose of having a Wireless LAN card in my Acer laptop. One of the programs I downloaded from the Acer Travelmate Series page was the Acer Wireless LAN Configuration Utility. This program allows me to see the current network I am connected to and all the available networks I could potentially connect to. It reminds me of XP's Wireless Network Connection window/utility where you can see all available wireless networks, refresh the network list and connect to one of the networks. I should mention that my ISP set up a security enabled wireless network with WPA. This network requires a network key if you want to connect to it. I guess my Vista computer has the network key entered into it already. The problem is that I do not know what the network key is. Now obviously you would say just contact my ISP to get the key. And I will but there is just one extra weird issue. I am able to connect to another unsecured wireless network in the Wireless Network Connection window/utility. I can be on it as long as my Ethernet cable is plugged in. So this is not really wireless is it? And this indicates that even if I do get that network key password from my ISP, I will only solve one of the two problems I have. I will only solve being able to get online as long as I am connected to my router via the Ethernet cable. The Main Questions So how do I enable my acer IPN2220 Wireless LAN Card so that I can use my Acer laptop from anywhere with in my apartment? Or should I first get the network key from my ISP to access my security enabled wireless network? And then deal with getting the acer IPN2220 Wireless LAN Card working? Hard & Learned VS Easy & Stupid Of course contacting the ISP would be easier. Have em just come in here and do there thing. The problem with that is that they do not speak English (yeah, im in Poland) and it'd be a hell of a time trying to understand what they are doing (uncomfortable looking over their shoulder). Also, I want to learn how to do this task myself so that I can fix the problem if it ever happens again. You know, be more self sufficient. I look forward to helpful replies. Thanks, Xaviour

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• External HDD connecting via USB disconnects wireless LAN connection

  - by Kensai

  Strange problem. I have this MEDION Akoya PC that has a dedicated bay to slide an external HDD sold separately. It's very handy indeed cause the slot is providing a fast USB 3 connection and power to the HDD unit, without extra cables. All works fine except this show-stopper behavior to disconnect me from the router once I slide in the unit and it powers up. The moment I connect the unit the (normally) three-four WiFi connections I see in my neighborhood disappear and my own to the router loses its signal strength (no Internet traffic is possible). After a while it throws me off that one as well, never to connect me again as long as the unit is powered. Once I disconnect the HDD the various signals come back and it automatically reconnects to my own. What takes? Are we in front of a serious design fault by MEDION here? Does the spinning of the HDD on top of the PC cause electromagnetic interference strong enough to throw off my WiFi connectivity? Is it a simple USB problem? Some kind of strange hardware conflict? Where should I look?

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• cheap gigabit switch for small business

  - by neoice

  my friend's business is currently borrowing my Adtran 1224R and is very happy with it. it's configured with a few VLANs to segment customers, internal traffic and public wifi. port 1 is a "trunk" port to the router, a chunky Linux box with iptables+NAT. they push a lot of traffic over the LAN (data backups) and really need gigabit. besides, I'd like my Adtran back :P my goal is to find a cheap(ish) switch that can function as a drop-in replacement. it looks like VLAN trunking is actually part of the 802.1q spec, so anything with VLAN support should cover the current trunk-to-router setup. it's nice to have both a web interface and SSH, but I can configure it either way if needed. things like the Netgear GS724T have caught my eye, but it seems like none of the hardware in the $300-500 range have really solid reviews. I'm concerned that "cheaper" hardware might not work for a network full of power users. does anyone have a recommendation for the Netgear GS724T or a switch that will meet my needs?

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