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• Wireless network relay?

  - by IPX Ares

  Is there hardware (links would be great) that can connect to the wireless internet already in my house and provide hard links to other hardware? Basically the problem is that my basement is not wired up to let me hook up my cable modem. I have some electronics that do not have wireless and need a LAN wire. Is there something I could plug in downstairs to act as a relay hub?

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• SafeOffice 500 - how to enable VPN access to another network (out)

  - by Dani

  Hi, I have a safe office 500 box at my edge. (checkpoint's hardware firewall) I'm trying to connect to another office VPN using windows 7 pptp connection. It fails (saying something about enabling GRE). (after authenticating, hangs for a while, than give the error message.) Using the same computer with direct internet access (not behind the firewalls) works fine and I get connected. how do I setup the safe office to enable me to use vpn (pptp) out connections.

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• Outpost Firewall asks every time one specific application tries to access to network

  - by sergdev

  One of installed applications on my PC tries to send UDP packed. Outpost warns me about this. I say that Outpost should allow all activity for this application. But next time application wants to send UDP packed Outpost asks me again and again the same question. There is no problems with other applications but with this only. Is it possible to resolve such behavior or is it known bug? Thanks! I have installed Outpost Firewall Pro 2009 Version 6.5.3 (2518.381.0686)

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• Network latency and speed of light

  - by James

  This was kinda of covered by the following Is minimum latency fixed by the speed of light? , but i would like to add the follow up a bit. The scenario is as follows; we have two opposing sites one on the West Coast of the US and one in Ireland. The customer is in central Europe, and has requested a latency test. Ireland gives responses of ~65-70ms. However the West Coast guys claim to be faster with a response of 60ms. Now a quick check says that light in fiber would take about 42ms to make the trip to the States and 8.5ms to Ireland. So obviously this is a single hop and does not include routers, switches, firewalls, protocol overhead etc. Would I be right to call BS on their figures? As a final note I tested a ping to Google IP address that was allegedly on the west coast from a site that covered a similar distance and was amazed to get a response time of 20ms. Suggesting ICMP packets that travel twice the speed of light. So A) what am I missing B) Am I right to suspect shenanigans? UPDATE: Guys thanks so far for your help and I have been reading various previous questions on this. About 5 years I had an issue where the hop from the UK to Ireland added 10ms of latency no matter what we did. In the end I moved the servers; So imagine my surprise when I have guys that claim they are 5ms faster with a transatlantic trip. So again should I call BS? Oh and assume both sites are normal mortals that don't have access to Google magical routing, warp dives or flux capacitors. :)

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• other computer in the network cannot connect to mysql database

  - by user28233

  I have a vb.net program that uses mysql as its database. And it works when the computer has wampservr installed. But the program gets an unhandled exception error when the computer where its running does not have a wampserver. The only thing that is installed in it is the mysql connector net. How do I make it work. I just want the two programs to access the same mysql database. I already opened port 20 by configuring firewall. Both in TCP and UDP. What do I do? Do I have to tweak the codes? Anyone in here who have tried this before?

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• other computer in the network cannot connect to mysql database

  - by user23950

  I have a vb.net program that uses mysql as its database. And it works when the computer has wampservr installed. But the program gets an unhandled exception error when the computer where its running does not have a wampserver. The only thing that is installed in it is the mysql connector net. How do I make it work. I just want the two programs to access the same mysql database. I already opened port 20 by configuring firewall. Both in TCP and UDP. What do I do? Do I have to tweak the codes? Anyone in here who have tried this before?

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• Best way to connect a desktop computer to a 3g network

  - by dbyrne

  A friend of mine is moving to a building with no Internet connectivity. Ethernet and wifi are out of the question. What is the best way for him to get his desktop connected? The most obvious solution is for him to get an unlimited 3G data plan. What is the best way for him to set this up? I am assuming he should get something like Verizon's MiFi 3G access point, but does this have an ethernet jack?

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• Measuring cumulative network statistics per user or per process

  - by zsimpson

  I've been googling for hours -- Under Linux I want to know the cumulative bytes sent and received by user or by process over all ip protocols. The best I've found in my searches is that it's possible to use iptables to mark packets for a user, for example: iptables -t mangle -A OUTPUT -p tcp -m owner --uid-owner test -j MARK --set-mark 1 It appears that "tc" can then shape traffic with that but I just want the statistic -- I don't want to shape the traffic. I want something like: "user U has transmitted used XMB since time Y". I can't figure out how to get statistics from these marked packets. Also, I've looked at nethogs but they seem to be measuring the instantaneous flow and I need cumulative counts. Anyone have ideas?

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• Sharing storage between servers

  - by El Yobo

  I have a PHP based web application which is currently only using one webserver but will shortly be scaling up to another. In most regards this is pretty straightforward, but the application also stores a lot of files on the filesystem. It seems that there are many approaches to sharing the files between the two servers, from the very simple to the reasonably complex. These are the options that I'm aware of Simple network storage NFS SMB/CIFS Clustered filesystems Lustre GFS/GFS2 GlusterFS Hadoop DFS MogileFS What I want is for a file uploaded via one webserver be immediately available if accessed through the other. The data is extremely important and absolutely cannot be lost, so whatever is implemented needs to a) never lose data and b) have very high availability (as good as, or better, than a local filesystem). It seems like the clustered filesystems will also provide faster data access than local storage (for large files) but that isn't of vita importance at the moment. What would you recommend? Do you have any suggestions to add or anything specifically to look out for with the above options? Any suggestions on how to manage backup of data on the clustered filesystems?

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• Resolving loss of internet bandwidth in home network

  - by Caspar

  Recently, I've decided to connect my laptop at home to my modem/router through Ethernet cables built into my apartment. As these built-in Ethernet cables are usable via plugs built into the walls (called powerline adapters), I use some additional cabling (STP CAT6 cables) from my laptop/router to the plugs. In addition, I don't know any technical details about these built-in cables (as they're not visible), only the maximal bandwidth (1 GBit = Cat6?) that they're supporting. The built-in cables are Cat. 5e Ethernet cables. The problem is now that when I set up the connection, I cannot use the full bandwidth that my internet connection is actually offering (100 Mbit/s), only about 85 Mbit/s between 85 - 88 Mbit/s, despite the fact that all cables involved should support the maximal bandwidth. I know from other tests with one of the Ethernet cables in use that I can use almost 99 Mbit/s when I connect my laptop directly to the router/modem using only this one cable. In addition, it is very unlikely that the length of the resulting cable connection from my laptop to my router involving the built-in cables exceeds 100 m. So, what possible reasons for this loss of bandwidth exist? And how I can fix this issue? I hope this might help resolve the issue: The built-in cables appear to be Cat. 5e Ethernet cables. So, is there any problem when I connect Cat6 Ethernet cables directly to Cat5e Ethernet cables via the plugs?

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• What program sent which packet to the network [closed]

  - by Erik Johansson

  I would like to have a tcpdump like program that shows which program sent a specific packet, instead of just getting the port number. This is a generic problem I've had on and off sometimes when you have and old tcpdump file lying around you have no way to find what program was sending that data.. The solution in how i can identify which process is making UDP traffic on linux ? is an indication that I can solve this with auditd, dTrace, OProfile or SystemTap, but doesn't show how to do it. I.e. it doesn't show the source port of the program calling bind().. The problem I had was strange UDP packets, and since those ports are so short lived it took me a while to solve this issue. I solved this by running an ugly hack similar to: while true; date +%s.%N;netstat -panut;done So either a method better than this hack, a replacement for tcpdump, or some way to get this info from the kernel so I can patch tcpdump. EDIT: This was asked on superuser "tracking what programs sends to net", no good solution though.

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• SQL 2008 network logon

  - by gledhilla

  Hi I have a domain controller that I have installed active directory onto and have set up an account that I want to use for my SQL server installation on another computer that is linked onto the domain. I can search for the account in active directory and I am able to select it into the add new user section in MSSMS, however, when I click add I get 'Windows NT user or group 'DOMAIN\user' not found. Check the name again. (Microsoft SQL Server, Error: 15401) I have googled the Error code and I havent found a solution that has fixed the error. If you have any help I would be greatful Thanks :)

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• infiniband network between 3 servers

  - by grumpf

  Let's say I have 3 different servers, each one with an infiniband card. Each card has 2 different ports. (I don't know about the model yet) Is it possible to create 3 different networks and to allow the 3 servers to communicate with each other without any problems? (and any spof). I guess I just have to setup the /etc/hosts correctly. I really don't know about infiniband, so please help me :) Thanks in advance. EDIT: Point is to NOT USE a switch!

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• Hosting an NTP server on a standalone network

  - by cdated

  I have a LAN that is not connected to the internet, and I am trying to sychronize all the machines, Windows and Linux, to an NTP. All I've been able to find is setting up an NTP client with an internet NTP. How can I setup my own Linux NTP server, or find good documentation on how?

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• Network speed between a VM and another machine which is not residing on the same host, is 11MB/s at most

  - by Henno

  Problem Network speed between a VM and another machine which is not residing on the same host, is 11MB/s at most. Topology Facts ESXi5 version is 5.0.0.504890 VM has the latest Vmware Tools installed VM is using E1000 network driver Physical box has Win Srv 2008 R2 as the OS CrystalDiskMark says the drive on physical box can read/write 100MB/s vCenter is another vm on esx both vm and physical box are showing 1Gbps link speed Configuration Networking shows vmnic0 as 1000 Full NTttcp is a client/server tool from Microsoft for measuring pure network throughput Here's what I've done so far: Test1: VM is running Filezilla FTP Server (default settings, one user account made) Physical box is running Filezilla FTP Client (default settings) Physical box is uploading a big file to FTP server Transfer speed (as observed by Windows Task Manager on both machines): ~11MB/s (bad) Physical box is downloading that file from FTP server Transfer speed (as observed by Windows Task Manager on both machines): still ~11MB/s (bad) Could it be disk performance issue? Test2: Physical box is running ntttcpr.exe -a 6 -m 6,0,VM_IP_ADDRESS VM is running ntttcps.exe -a 6 -m 6,0,PHY_BOX_IP_ADDRESS Transfer speed (as observed by Windows Task Manager on both machines): ~11MB/s (bad) Could it be switch performance issue? Test3: physical box is running vSphere Client I open Summary Storage datastore Browse Datastore... from physical box and upload a file to datastore Transfer speed (as observed by Windows Task Manager on physical box): ~26-36MB/s (good) Could it be a vm specific issue? Test4: Installed ntttcp to another vm on the same esx server Measured network performance between vms on the same esx server with NTttcp Transfer speed (as observed by Windows Task Manager on physical box): ~90-120MB/s (excellent :) Test5: I have another esx server on the same site, connecting to the same datastore and same switch. Those two ESX servers have both 2 NICs. One NIC goes to switch while the other goes directly to the other ESX server. vMotioned one of the testing vms off to the other ESX host Measured network performance between vms on different esx servers with NTttcp Transfer speed (as observed by Windows Task Manager on physical box): ~11MB/s (bad) While I'm aware of these: ESXi 4.1 slow file transfer ESXi 5 network performance is slow Debian Etch and ESXi slow network speeds VMWare ESXi slow file copy to guest they did not help (or I must have been missed something)

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• how to separate a network for traffic

  - by Student_CVO

  At the moment our all computers in one big LAN, it is the intention to separate the admin and edu (it's in a school) especially for traffic and less for security. How do this best? I have a drawing, but can't post it (a can send it in a mail) Firewall?, VLAN?, IPCop (no two green zones)?, pfsense? ... Should there be two scopes on the dhcp server (WIN 2008 R2), one for admin and one for edu or is one scope enough? I would like your advice, I am a student in training with this task as a project. Thanks

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• ubuntu to ubuntu backup in internal network

  - by amirash

  hey, i got my development "home" server witch is ubuntu 10, i brought today a computer in order to make a backup to this computer (the development server does also to him self backups every day but im paranoaid so i want to have two backups just in case on diffrent computers) what is the best way to backup the system core of the development server (like norton ghost) & do a full & incrmnt backup of him to the new computer that ive brought? rsync? rdiff? scp? clonezilla?

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• How to calculate bandwidth limits per user on WiFi network

  - by Lars

  A typical 802.11g access point can provide around 25 Mbps of bandwidth. How is the bandwidth shared among the users? Furthermore, how many users can be served by a single access point using 802.11g in an environment with low interference, and average web activity from the users? The goal is to use bandwidth limitation to avoid starvation for some users in case some of the users start to download a file or stream HD video or some other bandwidth intensive activity. Can someone break down the math on this?

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• Tool to indicate type of network connection

  - by ggonsalv

  I know of whoami.exe. Is there a version called whereami.exe The output should be able to tell me if I am on a LAN, wireless or VPN. the machines would be running Windows Xp or better.

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• Sharing soundcard to network.

  - by zerkms

  Let's suppose I have a laptop (L) and desktop PC (D), both with Windows 7 onboard. It is SB X-Fi extreme soundcard with rather good 5.1 home theater connected. But it is not comfortable to watch video sitting on the sofa from my desktop (sofa is in the center of the room and D is in the corner), even though it is 23" monitor. So I'm watching everything from the laptop. So the question - is it possible somehow to "share" soundcard from D to L, so I will watch the video from notebook and listen the sound from the 5.1? L and D are connected via wi-fi (fast enough).

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• Accessing Network Printers from a Citrix Session:

  - by Harry

  We have an application that uses Active Reports documents. You pass a document the UNC of the printer and away it goes. We have a group that runs this application within a Citrix session and the truly networked printers function perfectly but shared printers that work well outside of Citrix become unreachable. Printers do not need to be defined on the machine running the report for the system to work. There is something in the way Critrix passes the information to the destination UNC that I don’t understand.

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• Icinga/Nagios to ping different machine on local network

  - by feronovak

  I have 3 machines, all remote IPs and all of them running nsclient++ with remote and local IP addresses: 46.*.*.1/192.168.1.1 46.*.*.2/192.168.1.2 46.*.*.3/192.168.1.3 I want nagios/icinga to remotely ping other local machines to see whether VLAN is working correctly. Is there a way to tell nagios/icinga to use machine 192.168.1.1 and to ping 192.168.1.2 and 192.168.1.3 ? check_ping is pinging only machine defined in host_name from icinga server. Icinga is on completely different ip range 92.*.*.* Is there a way to do this to see VLAN workes fine?

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• VB.net Network Graph code/algorithm

  - by Jens

  For a school project we need to visualise a computer network graph. The number of computers with specific properties are read from an XML file, and then a graph should be created. Ad random computers are added and removed. Is there any open source project or algorithm that could help us visualising this in VB.net? Or would you suggest us to switch to java. Update: We eventually switched java and used the Jung libraries because this was easier for us to understand and implement.

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• Best way to troubleshoot intermittent network outages?

  - by Ben Scheirman

  We have a Comcast 50/10 line into our office. We keep seeing very short but sometimes frequent drops in our internet service. It's enough to kick you off of skype and stop any websites from loading, which is obviously affecting our productivity. We've tried 4 different routers, we've tried moving everyone off of wireless and onto wired via a switch and so far nothing has helped. Right now we're on a Cisco SB WRP400-G1 router. Attached to the router is a 16 port switch going to the ports in all of the offices. We've moved to OpenDNS in the case that it was the comcast DNS servers going down. Today we tried putting the modem, router, and switch on a UPS to make sure it wasn't power fluctuations that was causing it. Every time we call Comcast, by the time they are here the internet is working fine. I'd like to somehow prove that the problem is with Comcast, so if that means plugging in a machine directly into their router and collecting data all day, I'm up for that. I just want to hear ideas on what tools to run and how to collect this data. I could just continuously ping google.com all day long but I'm not sure how valuable that data would be. Thoughts?

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• IIS not listening over external network, all other traffic working

  - by Beuy

  Hello there, I have a very odd situation, I have a server (let's call it X) running 2008 R2 with two NIC's in it, one is connected to the work domain and has a subnet of 192.168.10.0/24 the other is connected to a ADSL connection and has a subnet of 192.168.1.0/24. The server has IIS installed. On the ADSL connection I have setup a dynamic dns and port forwarding to allow external HTTP, HTTPS, FTP and RDP connections. FTP and RDP are working fine however neither HTTP or HTTPS are working at all. I can browse the websites by going to localhost on the machine, the HTTP and HTTPS ports appear as "Filtered" when I try to scan them using PortQueryUI and browsers respond with a "Server took too long to load or was not responding" error. This was working fine just a few days ago, Windows firewall is disabled I don't have any software firewall on it. And I'm really lost. Any help would be great.

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