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• I have to manually change the DNS suffix order every time I connect to VPN. Can I change this permanently or fix the problem somehow?

  - by CarlB

  Sorry in advance but I'm a programmer, not a network engineer, so I'm a noob at this stuff. Anyway, when I am not connected to VPN from my work PC at home, I have the following DNS suffixes listed (real domain names substituted): enterprise.org network.org company.com us.enterprise.org After connecting to VPN, one more DNS suffix is added to the very top of the list: problem-domain.com At this point, most network functions that I can normally perform when actually connected to the LAN in the office are unusable. I get error messages about the network paths not being found and what-not. Anyway, I played around with the suffixes and realized that if I just moved problem-domain.com down one spot to the second in the list, all the problems went away. Unfortunately, it returns to the top spot every time I reconnect, and I tend to get disconnected frequently. Is there something else I can do about this or should I just contact the IT department? I've had this problem before and they weren't able to resolve it but I suppose it would be worth trying again if I could get a different person on the job. What I don't understand is that I thought it didn't matter what order the suffixes were in? Isn't Windows supposed to go through each suffix until it finds a match (or has gone through all the suffixes)? Why is it quitting after the first one? Thanks in advance.

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• How can Icheck how much data has been transfered in a particular remote computer in my LAN?

  - by oDx

  I am the system administrator. I am suspecting some unwanted data transfers in some of the computers under my lan. This also effects the overall performance of the network. Is there anyway by which i can check the transfered data over a particular interval. I am not supposed to install any applications on any other computers than mine. I have the router access. I can use tools like ettercap dsniff wireshark etc.

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• Macbook not connecting to WIFI

  - by Model Reject

  I have been having this problem all week. My Macbook aluminium can't see my wifi network. I have changed the channel to one that isn't being used by neighbours and my iphone picks it up straight away. In other words, the router is fine. It's just the macbook can't see it. This is driving me nuts if anyone can help... My airport card details... Card Type: AirPort Extreme (0x14E4, 0x8D) Firmware Version: Broadcom BCM43xx 1.0 (5.10.131.36.1) Locale: ETSI Supported PHY Modes: 802.11 a/b/g/n Supported Channels: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 36, 40, 44, 48, 52, 56, 60, 64, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140 Wake On Wireless: Supported The funny thing is that is was intermitent on Saturday. I had to keep restarting router and it worked for about 5 minutes, now it doesn't connect or see it at all. Tried using kisMAC and it can't see network either. Thanks, C

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• Separate 2 networks with 1 Windows Server

  - by SamuGG

  The situation is: I have 1 router 192.168.1.1, 1 switch, 1 windows server and a basic LAN of devices accessing it. I need to split into 2 separate LANs with full Internet access each, but isolated from each other. Given that, the server is a Windows Server 2008 R2 with 2 NICs: NIC1: 192.168.1.2 NIC2: 192.168.2.2 The router has no dhcp configuration. Please, can anyone explain gracefully, step by step, what do I need to do? What would be the 2 NICs full configuration? What services do I need to install? I don't want devices on either network to see devices on the other network, they must be completely separate. I guess I'm missing the routing procedure step, but I have no idea how is that done. For example: tell the server that devices with gateway 192.168.2.2 must send traffic for internet to 192.168.1.1 router. Thanks in advance.

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• Regarding the functioning of the HTTP server

  - by Luv

  As all of us uses the HTTP protocol for accessing the web, and request at the port number 80 of the server, now suppose i want to browse or download a file then i will request to the HTTP server by specifying the complete URL. If the server is having file, it would return it if it is not having the file then what will it do? I think it will make the request to the appropriate server which would be having this file and get the file and return to us. In this way does the HTTP server acts as an intermediate between the client and the server? Please correct me if i am wrong here. Many many thanx in advance

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• /etc/hosts file for a multi-homed, multi-domain machine?

  - by threecheeseopera

  I have a server (debian) with two network interfaces that I would like to host multiple services and domains on; it is not entirely clear to me how the hosts file should be set up. Example: eth0, bound to WAN interface 1.2.3.4: mail.example.com www.example.com eth0:1, bound to WAN interface 1.2.3.5: www.other-domain.com eth1, bound to LAN 192.168.1.123: some-clever-hostname What should my hosts file look like? (including localhost,localhost.localdomain, etc.) Should I use DNS for some of these entries? Which ones? Thanks!

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• ubuntu 12.04 kvm virtual server network setup, can't get the machine to be connectable

  - by xyious

  I have worked on my Ubuntu Server host for weeks now and I just can not manage to get the virtual machines into the network.... here's what I need to do: I need to be able to create virtual machines that have IP addresses that can be reached from the outside (192.168 network). I need to be able to connect to the virtual machines through ssh, ftp, http and preferably https, anything else doesn't matter that much. So far everything seems simple enough and I have a lot of leeway in terms of IP address range and server/client configuration. I have the option of taking part of a /24 net as most IPs aren't used, and if it's absolutely necessary I have the option of creating a new /24 subnet. Also have the option of reformatting and reinstalling OS on the host and recreating the virtual machines as nothing has been done other than trying to get virtual machines to work. I would prefer if the virtual machines were just part of the normal network which would be 192.168.5.0/24. The host machine has 2 network cards so I don't even necessarily need the Host to be connectable in the same /24 network. I have tried (I think) just about everything from about 5 different tutorials on bridging (giving br0 the same IP that eth0 used to have (Host is able to connect to VM and vice versa, VM doesn't have outside network access), having eth0 set up like it always was and having br0 have a different IP (same as above), NAT with port forwarding (which I would have preferred not to use but will if it works), turning off one of the hosts network cards and just using one of them, different subnets.... etc. I do know my way around iptables fairly well.... Host is 64bit Ubuntu Server 12.04, using libvirt/kvm. edits: Local network is 192.168.5.0/24, host has static ip 192.168.5.254, GW .5.1 which is also nameserver. We have a second Local network at 192.168.10.0/24 with .10.1 GW, but both hosts and VMs were supposed to go into the .5 subnet. The .10 subnet isn't required, but it wouldn't be horrible if the Host were only accessible in the .10 subnet.

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• Central Storage for windows user accounts homedirs .. hardware/software needed?

  - by mtkoan

  We have ~120+ users in our network, and are endeavoring to centralize logon authentication and home directory storage server-side. Most of the users are Windows 2000/XP machines, and a few running Mac OS X. Ideally the solution will be open-source-- can this all be managed from a Linux server running LDAP and Samba? Or would a hacked-NAS Box with a FreeNAS or similar suffice? Or is Micro$oft's Active Directory really the preference here. Is it viable to store PST files on this server for users to read from and write to? They are very large ~1.5gb. We have no mail server (or money) capable of Exchange or IMAP, only an old POP3. What kind of hardware horsepower and network architecture should we have for this kind of thing?

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• Potential impact of large broadcast domains

  - by john

  I recently switched jobs. By the time I left my last job our network was three years old and had been planned very well (in my opinion). Our address range was split down into a bunch of VLANs with the largest subnet a /22 range. It was textbook. The company I now work for has built up their network over about 20 years. It's quite large, reaches multiple sites, and has an eclectic mix of devices. This organisation only uses VLANs for very specific things. I only know of one usage of VLANs so far and that is the SAN which also crosses a site boundary. I'm not a network engineer, I'm a support technician. But occasionally I have to do some network traces for debugging problems and I'm astounded by the quantity of broadcast traffic I see. The largest network is a straight Class B network, so it uses a /16 mask. Of course if that were filled with devices the network would likely grind to a halt. I think there are probably 2000+ physical and virtual devices currently using that subnet, but it (mostly) seems to work. This practise seems to go against everything I've been taught. My question is: In your opinion and  From my perspective - What measurement of which metric would tell me that there is too much broadcast traffic bouncing about the network? And what are the tell-tale signs that you are perhaps treading on thin ice? The way I see it, there are more and more devices being added and that can only mean more broadcast traffic, so there must be a threshold. Would things just get slower and slower, or would the effects be more subtle than that?

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• Subnetting design for a new building?

  - by Zombie

  A building with 4 floors, each floor is divided as follows; 15 users for accounting, 15 users for finance and 15 users for marketing (i.e 45 user in each floor). Data center is located on the ground floor, with 45 servers to be divided into 15 for all the accounting users in the four floors, another 15 for the finance and the last 15 for the marketing. (i.e each 15 server for each one of the above categories are separated from the other 15 and so on) What is the proper subnetting design for such scenario? Knowing that we are allowed to use anything we want!

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• Multiple network interfaces and UDP packets distribution

  - by Robert Kubrick

  I have a Linux server with 2 1Gb network interfaces eth1 and eth2. If I start 2 clients listening to the same multicast address and each client connects through a different NIC (say client 1 listens to the multicast through eth1 and client 2 through eth2), then client 2 gets duplicate UDP packets. If both clients use the same interface eth1 on the other hand, both clients work fine. I have already tried to set arp_filter and proxy_arp to 1 (arp flux issue) but it hasn't solved the issue. Is this a Linux kernel problem? Or is there another way to setup the interfaces correctly?

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• What is the correct network configuration for a devStack VM (virtualbox)?

  - by Olivier

  Usually when I setup a new Ubuntu VM, i keep the eth0 in NAT mode to get the internet & I add a eth1 interface in HostOnly mode so that I can ssh. But using this devStack guide : Running a Cloud in a VM, it looks like it tried to use eth0 as the public interface (install got stuck because eth0 lost the network). I know an OpenStack setup usually requires two NICs, so I'm wondering what is the correct configuration for my VM.

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• Setting up Relays in Windows

  - by Auditor

  I'm trying to setup a pivoting relay with netcat on Windows, replicating a scenario easily possible by using pipes in Linux. Assume machine A can route to machine B and machine B can route to machine C. If machine A needs to route to machine C, we can setup a relay on machine B which can pivot data back and forth for us using command redirectors and spl filetype pipe. Assume: machine C has nc -nlvp 3306 -e cmd.exe machine A has nc -nlvp 80 IF machine B was Linux we could have done mkfifo pipe nc -nv 127.0.0.1 80 0<pipe | nc -nv 127.0.0.1 3306 1>pipe so on machine B if we do nc -nv 127.0.0.1 80 0<&4 | nc -nv 127.0.0.1 3306 1>&4 Per this site, I should be able to achieve what I can with Linux, but unfortunately it is not working.

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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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• Wifi and eth behavior

  - by r00ster

  I have a wireless router 150M Wireless Lite N Router Model No. TL-WR740N / TL-WR740ND. Normally, when I'm connected to the local network using eth0 I can ping other machines by issuing ping name. When I'm connected through wifi I have to issue ping name.domain.com. The machine is only visible in intranet. How to achieve the same behavior with wifi? The second problem is, that I can not connect to some external sites through wifi but through eth everything is ok. I guess that is related to some port forwarding, but I'm not sure. How can I resolve this issue? EDIT: I'm using Linux Mint.

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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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• 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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• Can I split one ethernet line coming out of my wall into multiple separate lines?

  - by Burteçin 'Turk' Sapta

  Hi all and thanks in advance. I'll start with some background. I live in an apartment which provides internet service included in the rent. They use company called pavlov for the internet http://pavlovmedia.net/ wireless seems to be working fine but wired connection is at least %30 faster. Ethernet, cat5 outlet is built in the wall, and there is only 1 outlet in each room. I would like to take this 1 outlet coming out the wall and multiply it into 4 wires, for desktop, playstation, tv and laptop without loosing any internet bandwidth. i have absolutely no idea weather this line is coming from a switch or a router but i have been researching Ethernet splitter, routers, switches, hubs and haven't found a solid answer. what is the best solution for me? thank you once again! EDIT: ok this picture cleared few things http://www.home-network-help.com/images/home-network-expanded.jpg so seems that an ethernet switch is to ethernet as a USB hub is to USB. what is really 10/100Mbps Network Switch and what is the cap?

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• ASUS WL-500gP v2 network between two local machines

  - by Epsiloncool

  I have two windows XP machines in my home networks, connected with ASUS WL-500gp V2 which also used as internet router. Problem is: while I have both computers normally goes to internet (used DHCP, static routes is ON, routing table is empty, operation mode is Home Gateway). I see both computers listed on the Network Neighborhood on 1st computer (wired to router), can enter to my own computer, but can not enter to other. I see only one computer (2nd) on the Network Neighborhood on 2nd computer (connected thru Wi-Fi), can enter to itself, getting error when trying to enter 1st computer address in address line (like \My1stComp). What is the problem? I totally crazy founding problem about 3 months.

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• How to attach multiple ipv6 ips to eth1 on debian

  - by Noodles

  I've just got a new server with native ipv6. I want to attach multiple ipv6 ips to eth1, but the only way I can see to do so is to attach them individually: i.e. address 2607:f0d0:xxxx:xxxx::2 address 2607:f0d0:xxxx:xxxx::3 address 2607:f0d0:xxxx:xxxx::4 Is it possible to bind whole subnets of ipv6 to a single network interface on debian? My server host tells me I have 18,446,744,073,709,551,616 ipv6 addresses for that server, surely it gets to be a nightmare to manage if they all have to bound individually (plus ifconfig would look messy). Does anyone have a solution?

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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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• Looking for a powershell script that can pull a file from a set of PC's and FTP

  - by DangeRuss

  I'm looking to write a script (preferably powershell) that will essentially copy a file from a bunch of PC's and FTP it to a server. So the structure of the environment is that we have a file on multiple PC's (around 50 or so) that need to placed on a server. Sometimes one of the PC's may be turned off so the script would first need to ensure the PC is up and running (maybe a ping result), then it would need to go into a directory on that PC, pull a file off of it, rename the file, place into a source directory, then remove the file. Naming convention doesn't matter, but date/time stamp would be easiest. Ideally, it would be best to first move all the files to a source directory to save on FTP bandwidth, but since the files will be named the same, the files must be renamed during the move process. Move not copy because the directory needs to be empty so the file can be re-created the next day. So once moved to the source directory, now all the files need to be FTP'd to a server for processing. After all of this, we need to know which PC's on the list did not respond so we can manually retrieve the file so the script should output a file (txt is fine) that will show which PC's were offline. Everything is one domain and script will be run from an server with admin creds. Thank you!

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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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• Network outage caused by SMC8013WG Cable Modem/Router ?

  - by mkocubinski

  At work, we have a basic Class C Network. The gateway/router is a SMC8013WG (stock comcast commercial cable modem), and simple unmanaged switch (HP Pro Curve 1400 24G). The SMC8013WG is our default gateway as well as DHCP server. Periodically, I'd say almost every other day.. the entire network will just stop responding. I won't be able to ping/see the gateway, any computers on our local network, or anything on the internet. The only way to fix this is to unplug the Comcast cable modem, wait, and plug back in. This unfailingly fixes the problem. But this doesn't make much sense to me.. shouldn't the network still be fine locally, since everything is plugged into the switch anyway? Why would resetting the router fix this? Can anyone suggest anything to check to in order to narrow this problem down? Just to be clear.. here is the basic topology: { Internet } -- (12.345.67.89) Comcast Cable Modem (192.168.1.1) -- Switch -- 192.168.1.2-254 P.S. Our IT guy is in about 3 hours a day every other week or so, so.. we're kind of on our own most of the time.

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• Why do I have inconsistent network issues with my laptop's wireless?

  - by Jason

  I'm having trouble with my laptop Internet connection. It's patchy at best and resets or freezes a lot. The signal strength is also random. I thought it might be a driver issue but now I don't know. Three other computers using the same wireless network run well. I've switched out wireless routers so I don't think it's the router. I thought it might be the laptop's internal wireless card but I just bought an external USB network card and I'm still having problems. Specs Lenovo T-60p Windows 7 Ultimate Edition Patches/drivers are up to date I only use one of the below at a time, disabling the other: Intel PRO/Wireless 3945ABG v. 13.3.0.137 (Internal wireless) Medialink Wireless-N USB 2.0 Adapter (USB wireless) Any ideas on what might be the problem?

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