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• Routing protocols, distance vector vs link state

  - by Artem Barger

  I'm trying to figure out the differences(pros/cons) between two routing protocols approach and I would be great-full for any help, advice and explanation. As far I can say that it seems like distance vector is more static and more local based routing, since it doesn't know the network state whereas link state is more aware of current states therefore it seems more natural to use it over distance-vector, but I have a feeling like I'm missing something. And I would be glad to here about more aspects and different issues I have to consider while choosing one of them.

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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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• Mac internet problems

  - by Bradley Herman

  Our office is set up with mostly macs (7 of them) but we do have a windows laptop and a windows desktop on the network as well. The network is configured with a modem going into a switch/router throughout the office to the computers, along with a wireless router. Everything runs fine most of the time, but periodically while using the web, certain sites will stop loading and timeout repeatedly. This usually lasts 20 minutes or so and can be incredibly annoying. Resetting the modem/router and/or rebooting the computer never helps. The weirdest part is that in almost every case, the websites are fine on our Windows machines. I frequently use github, google, Stack Overflow, and jQuery reference and I can count on the sites being unavailable to me at least once a day. While I can't get them to load, I can spin my chair around to the windows server behind me and load the sites just fine. Any idea what the hell could be going on here?

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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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• Arch Linux drops me on my school network

  - by Kravlin

  I'm running a Lenovo X61 which i carry around my college for getting on the internet at various points in the day. The network has always been finicky but recently it's gotten worse. I'll connect using iwconfig, get an ip from dhcpcd and log in using vpnc to their system. Sometimes I'll stay connected for hours but most of the time within 30 seconds my network traffic will drop to zero and i'll be unable to do anything. My computer still belives it's connected, however to try again i need to put my wireless interface down, put it back up and try again. It's gotten so bad that i've got a window on my computer pinging yahoo or google constantly in order to know if i'm still able to get online. I know other people who have used Arch Linux that don't have the same problems as well as people who use Ubuntu who haven't had any problems either. It seems like my computer is a special case. Does anyone have any suggestions on how to fix it? dmesg doesn't show anything out of the ordinary going on and i don't know where else to look for errors or other things to try. Edit: this doesn't happen on my home network. It's a problem that only happens at school.

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• Windows 7 Administrator HomeUsers Account

  - by Charles Carrington

  I'm trying to login to my Windows 7 PC from another PC so that I can transfer files to the Windows 7 PC. I've just installed Visual Studio 2008 on my new PC, and I wan't to transfer all of my work from my old machine to my new one. When I first set up a user on the Windows 7 PC after a reformat, the account created had a Group field that read "HomeUsers; Administrators" when viewing it from the User Accounts screen. You get to this screen by typing "netplwiz" in the search field of the Start Menu. I changed the Group of this account to Administrators before I realized that it was assigned to two Groups -- "HomeUsers; Administrators" as I mentioned above. I was trying to make sure that it was an Administrator account so I didn't have to type in a password everytime I wanted to install software. I can use this computer normally without being asked for an administrator password all the time when I want to install new software, but I can't log in to this PC from another PC because I don't have an account that has a Group of "HomeUsers". I should have left the account alone; everything would've been fine. But there doesn't seem to be a way to assign it to two groups after the initial assignment that take place automatically when you are setting up your computer for the first time. If you assign "HomeUsers" to the account, the Group field on the User Accounts screen will just read "HomeUsers". If you assign "Administrators" to the account, the Group field on the User Accounts screen will just read "Administrators". There's no way to make it read "HomeUsers; Administrators" again. If you don't have at least one account that is a "HomeUsers" account, you cannot log in to the PC from another PC on the network. If you don't have an account that is an "Administrators" account, you cannot install software on your machine without being asked for an Administrator password all the time, which is very annoying. I want an account on my Windows 7 PC that I can use to install software without being asked for a password AND that I can log into from another PC on the network to transfer files. If I could make the Group field read "HomeUsers; Administrators" of my primary account on the Windows 7 PC when I go to the User Accounts screen by typing "netplwiz" in the search field of the Start Menu, my primary account would do what I want it to do. Does anybody know how to make an account in Windows 7 a "HomeUsers" account AND an "Administrators" account? As I said before, Windows 7 does this for you automatically when you first set up your computer. But if you change it inadvertently, there is no way to change it back. At least I don't know how to do it. If anybody has any ideas on how to fix this, I would greatly appreciate it. Thanks, Charles Carrington

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• cannot reach munin port on other AWS instance

  - by Amedee Van Gasse

  2 AWS instances, in the same region but different availability zones, one is in regular EC2 and the other is in VPC, both have an Elastic IP, both are 64bit Amazon Linux AMI 2014.03.1. Both are running munin-node. The instance in the VPC is running munin-cron. I have added incoming TCP and UDP port 4949 to the security groups of both instances. On the munin node, I added an allow-line with the IP address (regular expression) of the munin server to /etc/munin/munin-node.conf. I bind munin-node to any interface using host *. Then I did sudo service munin-node restart. Then I ran netstat. $ sudo netstat -at | grep munin tcp 0 0 *:munin *:* LISTEN So the port is open there. On the munin server AND on the munin node: $ nmap AMAZON-IP -p 80,4949 | grep tcp 80/tcp open http 4949/tcp closed munin On the munin node: $ nmap localhost -p 80,4949 | grep tcp 80/tcp open http 4949/tcp open munin So from the outside, the http port is open (Apache is running) but the munin port is closed. The node can't even reach the munin port on it's own public IP address, but it can on localhost. I added port 80 as a sanity check, to be sure that there is network connectivity at all. So what am I overlooking here?

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• How to connect cable internet on ubuntu

  - by NAVEED

  I was using my cable internet on windows and it was working. Now I moved to ubuntu for development work. But I am unable to connect this internet on ubuntu. I called their technical support and they ask me to install PTPPN (I have forgot the exact name) and then provide our server name, your username and passowrd. I download that software PTPPN(whatever) by using a debian file but I did not find it after installation. I tried to contact to technical support again but unable to connect. Can someone please tell the exact name of that software and how to install and then connect to internet on ubuntu? I have only the following information for now: Install "PTPN" on ubuntu. (forgot exact name of this package) servername: blue.connect.net.pk username: myusername password: mypassword Thanks

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• My windows xp wireless hotspot wifi isn't working

  - by Dominic Grenier

  I add the hotspot the regular way. Yet it doesn't show up as available when I try to connect to it using my other Ubuntu laptop. And nothing can connect to it. Yesterday, I successfully made it work for 5 minutes and then it stopped without me changing any configuration. I've already tryed resetting the DNS. Edit: I've updated my Broadcom 802.11b/g driver to a generic but more recent version. I've also repaired the WMI, now the advanced tab of my primary connection is available and the hand meaning the connection is shared appeared. But the computers still connect the wrong way around. (Windows to ubuntu instead of ubuntu to windows) Reinstalled SP3...

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• Access Methods to a computer Using MAC Address

  - by Dimal Chandrasiri

  I have my own wifi network at home & recently when I checked the active clients on the wifi I found out the there is one active client. Router shows the MAC address of this client and I want to Access this computer in order to let him know that he's doing a wrong thing. I dont intent to do any harm to his data. I just want to know a method to send him a message saying "Buy you own wifi". How can I achieve this using a windows 8 computer. Is there any specific softwares that I can use or will the netsend command do the trick! Thank you.

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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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• Kickstart: ifcfg-eth0 file genorated by kickstart when install from network but from initrd when install form USB

  - by dooffas

  When I install Fedora 19 with a kickstart file and via network, the generated ifcfg-eth0 file is genorated by the kickstart: # Generated by parse-kickstart However if I use the same kickstart file and install via a USB stick, the ifcfg file is generated by initrd. # Generated by dracut initrd The line in the kickstart file to set the network settings is as follows: network --device=eth0 --bootproto=dhcp --hostname=SOMEHOSTNAME Is there away to keep network device settings set in the kickstart file when not installing via network?

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• Printing on Windows 8 with PDF viewer (Adobe Reader) from network

  - by Bongo

  i have a problem with the Adobe Reader 8, but the problem seems to be equally bad with other pdf viewers. Here is the configuration: My PDF viewer is located on network drive "Z:" which is the network adress \dgs-main\progs. I tried to start the adobe reader from here - \\dgs-main\progs\Adobe\Reader 8.0\Reader\AcroRd32.exe and open the PDF from here - C:\Users\ServiceDesk\AppData\Local\Temp\GeneratedPDF.pdf The problem is as follows, if i open the PDF with a local PDF viewer everything works fine and i can print the document. If i open the PDF with the Network PDF viewer then it opens, but printing is impossible. The error message states: "Unable to start print job. Is printer available?" As mentioned above, it works with a local pdf viewer. In both cases i use the same printer. The Printer is a network printer but even with a local printer it fails. The error occurs only on Windows 8 machines. On windows 7 it works fine. I Hope somebody can tell me what the problem is. Thanks in advance and have a fine day.

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• Sharing a wifi connection between different user profiles on Windows XP

  - by crowne

  I've set-up two separate user profiles on an old laptop running Windows-XP, and noted the following strange behaviour. When the wireless network is setup using WEP both user profiles can connect to the internet and I can switch between user profiles, without network connectivity issues. However when I changed the wireless security to WPA2, the first user to connect gets access to the internet, when switching to the second profile the connection fails. The behaviour is the same regardless of which of the two profiles logs on first. I also tried this with one user with admin rights and one without, and got the same result. I'm not too concerned about a fix for this other than forcing the users to log-off when sharing the laptop, but I'd be interested to know if anyone can corroborate my findings. The network config was done using Intel® PROSet/Wireless.

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• Windows 7 Wireless Network Adapter Stopped Working

  - by Andrew B Schultz

  I have a Windows 7 Ultimate machine where the wireless adapter all of a sudden started having trouble connecting to wireless networks. Whenever I go to a new place and try to connect to a wireless network, it says that the DNS server is not responding, and tells me to go unplug the router and try again. After several locations in a row telling me this, I began to realize something was wrong with my adapter, not the routers. I am no longer asked to identify the security level for any new networks (Work, Home, or Public) like I used to be (it defaults to Public now - with the park bench icon). Often, resetting the router doesn't even work. Running the Windows 7 troubleshooter doesn't give me anything better than the advice to reset the router. However, the adapter will still connect to the wireless network at my main office without any problems. Does anyone know why a wireless network adapter can get so finicky so suddenly? Thanks!

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• CentOS 6.3 Virtual under OpenVZ cannot ping, host lookups, outbound connections while postfix running

  - by Paul Cravey

  My best theory is that some kernel limit is being hit preventing outbound connections. We have tried basically everything from tcpdumps to provisioning an entirely new virtual server (we do not have this problem on any other virtuals), however the problem somehow carried over, even with new postfix build (working). Emails work, and outbound connections work, so long as postfix does not have too much going on. /proc/user_beancounters shows no limits being hit (show below). Nevertheless, pings fail even to IP addresses. TCP stack appears healthy. Load is low. No iowait. Flushed iptables already. Has anyone experienced anything like this? uid resource held maxheld barrier limit failcnt 3: kmemsize 166216365 170262528 9223372036854775807 9223372036854775807 0 lockedpages 0 0 9223372036854775807 9223372036854775807 0 privvmpages 285727 351885 9223372036854775807 9223372036854775807 0 shmpages 16933 17605 9223372036854775807 9223372036854775807 0 dummy 0 0 0 0 0 numproc 150 303 9223372036854775807 9223372036854775807 0 physpages 314156 326191 0 1280000 0 vmguarpages 0 0 9223372036854775807 9223372036854775807 0 oomguarpages 165355 165355 9223372036854775807 9223372036854775807 0 numtcpsock 89 172 9223372036854775807 9223372036854775807 0 numflock 22 76 9223372036854775807 9223372036854775807 0 numpty 1 2 9223372036854775807 9223372036854775807 0 numsiginfo 0 75 9223372036854775807 9223372036854775807 0 tcpsndbuf 2733472 4371752 9223372036854775807 9223372036854775807 0 tcprcvbuf 1798336 5427296 9223372036854775807 9223372036854775807 0 othersockbuf 491120 1000760 9223372036854775807 9223372036854775807 0 dgramrcvbuf 0 238728 9223372036854775807 9223372036854775807 0 numothersock 361 505 9223372036854775807 9223372036854775807 0 dcachesize 135941831 136114679 9223372036854775807 9223372036854775807 0 numfile 2905 4990 9223372036854775807 9223372036854775807 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 numiptent 8 9 9223372036854775807 9223372036854775807 0 [root@bni /]# ping 4.2.2.1 PING 4.2.2.1 (4.2.2.1) 56(84) bytes of data. --- 4.2.2.1 ping statistics --- 9 packets transmitted, 0 received, 100% packet loss, time 8493ms [root@bni /]# service postfix stop [root@bni /]# ping 4.2.2.1 PING 4.2.2.1 (4.2.2.1) 56(84) bytes of data. 64 bytes from 4.2.2.1: icmp_seq=1 ttl=53 time=8.63 ms 64 bytes from 4.2.2.1: icmp_seq=2 ttl=53 time=8.62 ms 64 bytes from 4.2.2.1: icmp_seq=3 ttl=53 time=8.63 ms 64 bytes from 4.2.2.1: icmp_seq=4 ttl=53 time=8.66 ms Outbound connections of all sorts fail when postfix is running.

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• Can a Linksys Router be the cause of bad speeds on a 1.5 mbps link.

  - by gramware

  We use a Linksys 5-port router at a smal organization with about 20 employees. We recently acquired a 1.5 mbps fibre link, but sometimes the link goes down and speeds are still low. On enquirey from the ISP, this was part of the response, However there maybe throttling due to the router in place. A Linksys is a low end router and may be unable to carried traffic of up to 1536Kbps. We are in a position to deploy a Cisco 871 router on test for 2 wks to eliminate that possibility. Also kindly advise the destination of the ping results they look to high. How true is that about the router throttling the network and need for a bigger one.

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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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• 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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• What does this TCP Packet mean ?

  - by asksuperuser

  I'm total newbie at tcp/ip and I was experimenting with Wireshark. What this mean: 1824 578.194204 xxx.xxx.xxx.xxx yyy.yyy.yyy.yyy UDP Source port: 17500 Destination port: 17500 In data I can see that my user pc name is sent (happily it's a generic name): does this mean someone is trying to hack my pc ?

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• Have Ubuntu auto-connect to wireless AP without logging in

  - by dragonmantank

  We have an ubuntu box set up to do some monitoring but due to the placement are unable to run CAT5 to the box itself. I have an Atheros PCI card that works great as long as someone is logged into Gnome and it doesn't disconnect from the AP during that time. Is there a way to have Ubuntu connect to the AP during boot, and always reconnect if it finds a signal from a specified AP? The box would have a static IP and only connecting to a specific AP using WEP.

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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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• How to configure 2nd network card for use in VMWare Workstation?

  - by Timo

  Hi all, I am using VMWare Workstation 6.5, connected to my network with a bridged adapter so that the virtual machine OS (Windows XP) has its own IP adress. This just worked out of the box. Now my host machine (Windows Vista) has an additional network card that is directly connected to another computer using a crossover cable (and fixed IP adress 10.1.1.4, while the "main" network connection is using DHCP with IP in the 192.68.0.* range). How can I use that network connection as well in the virtual machine? Do I need to bridge my 2nd network adapter to some VMnetX adapter? Do I need to add a host virtual adapter? I do not know much about networks, and the VMWare network settings really confuse me :-) Thanks, Timo

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• Splitting build cross the network?

  - by Dandikas

  Is there a known solution for splitting build process cross the network machines? Use case: We are an average software development company. We own around 50 development workstations (Quad Core 2.66Ghz, 4 GB ram, 200 GB raid). No need to tell that at any single moment not every machine is loaded to the max. There are 5 to 15 projects running simultaneously at any single moment. Obviously all of them are continuously build on server, than deployed to proper environment. Single project build is taking from 3 to 15 minutes. The problem: Whenever we build 5 projects in a row the last project is going to be ready after around 25 - 50 minutes. Building in parallel does not solve the problem (build is only a part of the game, than you need to deploy, run tests etc.) YES the correct solution is to add another build server, but "That involves buying new Expensive hardware, and we already spent a lot!". Yea, right(damn them)! Anyway. What about splitting build among developers workstation? Lets say whenever we need to build project "A" we check 5 workstations and start build on all that are not overloaded. The build can be canceled by a developer if he really needs all the power of his machine as long as there is at least 1 machine that is still building. After build is finished deployment can be performed to a proper environment (hosted on some server, not on workstation :) ). The bigger the company the more this makes sense to me. Anyone tried something like this? Are there any good practices? Any helpful software?

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• Configure TCP/IP to use DHCP and a Static IP Address at the Same Time

  - by Tiago

  My computer is configured to obtain a IP address automatically using DHCP. It only has one network adapter. How to configure an additional static IP address? I found a tutorial for Windows XP, but the procedure didn't work for Windows 7. Is it possible to configure two IP addresses on Windows 7, one being static e another being dynamic? How? The dynamic address I got now is 10.17.11.162. The static IP is 10.17.30.19. The network mask is the same: 255.255.224.0. Both work independently, but I don't know how to use both at the same time.

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