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• Where does traffic shaping typically take place?

  - by eekmeter

  As part of upgrading our network infrastructure we are looking to traffic shape our bandwidth since we only have about 3Mb down / 1 Mb up. We're looking to prioritize it so that web browsing gets priority and in the future some VOIP might be added in as well. Internal LAN traffic doesn't need to be controlled just our outbound connection. I've been looking at Cisco hardware and it seems that several of their products do shaping at the core switch, firewall, and router level. I'm wondering where does shaping normally take place? Is it normally done at the router, core switch, or firewall?

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• safe to setup NAS in virtual image with web server?

  - by Erik

  My current setup is Ubuntu Desktop, running Apache + MySQL + PHP stack. I use this image to host my small website to the outside world. I want to now run a virtual machine on the box, that will act as the FreeNAS box for my internal network. This sounds like a bad idea if the website gets hacked/attacked. Should I just give up and grab a dedicated machine instead? Can I instead virtualize the web server and NAS side by side on this machine?

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• curl makes a site work externally once run locally (apache)

  - by Kyle_at_NU

  Currently when I visit mysite.mydomain.com external to the local network I get in the browser: This is the default web page for this server. Nothing to see here. This is not even the "It Work's" Apache page. Then if locally (Apache2 on Ubuntu Server 12.04 with curl installed ) type: curl mysite.mydomain.com I get the site I expect. Then the next time i visit the page externally I get the correct site. Has anyone seen this before? Tips/Suggestions?

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• Amazon EC2 IPSEC

  - by John Qualis

  I have configured a ubuntu 12.04 64-bit server machine on Amazon AWS to act as a strongswan IPSEC server. I want to connect to it from my MAC OSX Lion's inbuilt IPSEC client. The OSX machine is in my home network. I log into the AWS machine using a ssh to ubuntu@public-ip and I provide the private RSA key in form of .pem file which I downloaded when the machine instance was created. The ssh connection works file but the IPSEC connection fails. What credentials/configurations should I provide for an IPSEC connection from my OSX client to AWS ubuntu server? My OSX machine is behind an ISP provided modem/router. Appreciate any help and thanks in advance

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• What constitutes "commercial purposes"?

  - by RoboShop

  I'm looking at this license. It says that I can use it for "non-commercial purposes". What does that mean? I see in Stack Exchange, under Network Profile there is that graph that tracks your points across your Stack Exchange accounts. It uses a control called HighCharts which have a paid and Creative Commons licensed version. So would Stack Overflow constitute a commercial site? We don't pay to use this site, but obviously the site makes money from ads, etc. Then again, there's a lot of sites that have ads who won't necessarily make a profit, it may only be subsiding their costs. But even then, you could argue that even if it is only subsiding their costs, a lot of IT companies run at a loss in order to build a big enough customer base. So where is the line here? Is it any website on the internet? Is it any website that has ads? Is it any website that turns over a profit?

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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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• Opinion choosing Switch

  - by mastercode

  ) i have to reestruct a LAN network, with (currently) +/- 60hosts connected ... i have File Servers hosted, VoIP Phones,wireless AP's,printers, scanners, plotters,biometric dispositive,and 2 QNAP TS412 as FileServer and BackupServer, a Mac Mini as main Server of almost all services that need server ... and, a HP V1910-24 (L2+) and another two switches,but, only L2. which switch in your opinion, could fit better this reestruct, to ensure a VLAN division- and have to support Inter VLAN routing also - provide better performance, and also, allow a Future expansion. the budget, is low xD hehe!!

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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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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• CSS file not served by IIS 7.5 after multiple clear cache refreshes in a row in browser

  - by KenB

  We are experiencing an interesting issue with IIS 7.5 static caching and a css file. When we use IE to hit the page in question everything works fine - 200 OK on css file. When we refresh the page it works fine - 304 Not Modified on css file. When I refresh again with control key it reloads fine - 200 OK on css file. Now if I do a control key + refresh multiple times in a row really fast the css fails to load and in the developer tools network it says "Loading..." for the css file and it hangs never coming back. Any ideas?

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• Unable to connect to vrde virtualbox VM remotely

  - by b1ackjosh

  So I've remotely created my first headless using ssh. Now I'm attempting to connect to this VM using RDP so I can install Ubuntu Server, but I cannot get connected at all. When starting the VM everything appears fine: $ vboxheadless -s WebTesting Oracle VM VirtualBox Headless Interface 4.0.16 (C) 2008-2012 Oracle Corporation All rights reserved. VRDE server is listening on port 4455. And showvminfo shows: VRDE: enabled (Address 0.0.0.0, Ports 4455, MultiConn: off, ReuseSingleConn: off, Authentication type: null) However I'm still prompted with the "enter your credentials" screen every time I attempt to connect. From reading the documentation null shouldn't prompt me with this screen at all... Any help with this is greatly appreciated. P.S. I am using ssh tunneling in putty to tunnel in to my network.

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• Bacula configuration for clients that are turned on and off randomly

  - by Rastloser

  I'm evaluating Bacula as a centralized backup tool for a small network where users will turn machines on and off unpredictably. Some of the headless Linux boxes I need to back up are intended to be turned off by pressing the on/off-button on the case, without any way of telling the user to wait for a backup job to finish. So, we don't know when backup jobs may run (anacron might help with this, right?) and we don't know whether they'll be allowed to finish. Is Bacula a reasonable choice for such an environment?

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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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• Squid randomly stops serving requests. How can I resolve this issue?

  - by Vijay

  The squid (2.7) proxy that I have running on ubuntu 8.10 stops accepting new requests after being online for a while, due to reasons that I can't discover. However doing a squid -k reload resolves the problem immediately. Now I manually run this command by monitoring the log and if i don't see any activity for 5 minutes I reload the config. Now on my quest for a solution I had several ideas: diagnose the root cause and eliminate it setup a script to automatically reload script if no new entries in access.log for the past 3 minutes painstakingly upgrade server to newer ubuntu version while keeping network offline or during off hours to minimize downtime. so i thought I would turn to you for solutions to option 2), as I do not understand squid enough for 1), and I'm avoiding 3) as long as i can. so can ideas?

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• Testifying that somaxconn change can make a difference

  - by petermolnar

  I got into an argument on the net.core.somaxconn parameter: I was told that it will not make any difference if we change the default 128. I believed this might be enough proof: "If the backlog argument is greater than the value in /proc/sys/net/core/somaxconn, then it is silently truncated to that value" http://linux.die.net/man/2/listen but it's not. So does anyone know a method to testify this with two machines, one running, for example MySQL or LVS and the other is hammering it in a GBit network? I'm opened to any solution, scripts are slightly more welcome.

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• And the Winner Is ...

  - by Oracle OpenWorld Blog Team

  If you know excellent Oracle technologists, now's your chance to nominate them for an award. by Karen Shamban It’s possible to win an Oracle Excellence Award in one of 12 categories this year—nominations are open now through July 17, 2012. Winning customers and partners will be hosted at Oracle OpenWorld or JavaOne 2012, where they can meet with Oracle executives, network with peers, and be featured in an upcoming edition of an Oracle publication such as Oracle Magazine. This year’s Oracle Excellence Award categories are: •    CIO of the Year•    Database Administrator of the Year•    Eco-Enterprise Innovation•    Java Business Innovation•    Leadership•    Oracle Fusion Middleware Innovation•    Proactive Support Champion–Global•    Specialized Partner of the Year–Europe, Middle East, and Africa•    Specialized Partner of the Year–Global•    Specialized Partner of the Year–North America•    Technologist of the Year Learn more about each award and nominate a deserving candidate now! Go to the Oracle Excellence Awards information page for details.

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• syslog facilities

  - by user65971

  Hi, I have an application (in java) running in a windows PC and I want to send logging messages to a syslog server running in a linux box somewhere in the network. The problem I have is, that it is not clear to me what should I use as facility in this case. I.e. can I (/should I) send the logging info as one of LOCAL0-LOCAL7? Or are they not supposed to be used by remote applications? It is not clear to me if they are usable or not. Should I use USER instead? Could anyone help me on this please? Thank you

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• Windows Load Balancing Services and File Shares

  - by cbkadel

  We are using Windows Load Balancing Services (WLBS). One of the things that I do notice, is that if I create a File Share on one of the physical hosts, I am able browse to that file share using the clustered-ip address. This might be a 'opinion' question, but I haven't been able to find much literature on file shares in particular with wlbs. Is this a recommendation configuration? Are there any limitations? What about when the share contains different sets of content on both hosts? For instance: Three 'hostnames' - host1 (physical1), host2 (physical2), and cluster. I create the following shares: \physical1\myshare \physical2\myshare What I notice is that i can see: \cluster\myshare I'm guessing that this is read-only, and that there's no file synchronization. But what happens if they are in fact out of sync, what would a network browser see then? Thanks for your time!

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• Prompt for credentials in a batch script

  - by Inteladu

  I am trying to perform a network copy of files via a batch script. However, as usual there are some networks where the 'copy' command fails saying 'Bad username or password'. And when I try using xcopy, it never works. I have also tried using, net use \\server\ password /user:domain\username net use \\server\ipc$ /user:domain\username password But none of these work. Any ideas on how I can accomplish this? I was also wondering if it is possible to prompt the ususal Windows login dialog for this...(just an idea) Any leads on this would be highly appreciated. Thanks & Regards, inteladu

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• Ubuntu 10.4 No internet

  - by Keeper780

  I have Ubuntu 10.4 dual booted with Windows Vista on a work Lenovo R61 laptop. The home and work wireless connection were working fine. I lost all internet connection at work. The IT guy clearly knew nothing about Linux. Since he 'fixed' it get nothing, no wlan signal the Network manager icon was gone, no internet. I still have the live disc and if I run from the live disc the connections are there and everything works perfectly. How do I restore the internet easily on my laptop. I have been using Linux for 3 Years but I am still a bit of a newbie, this is the first major problem I've had in three years. It's driving me nuts. Thanks

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• Web map services displaying poorly

  - by user29261

  Web map services no longer display correctly in ArcGIS and Google Earth - no one else on network is experiencing these. Using windows 7 OS. These problem began abruptly (1 day they were working, the next they were not). Specific problems include not displaying at all; correct display on 10% of the monitor and repeating lines of coloured squiggles and text on the remaining 90%; and small, widely spaced, pixels in place of colour fill. Links where this occurs: arcgis http://wms.ess-ws.nrcan.gc.ca/wms/toporama_en Google earth http://openmaps.gov.bc.ca/kml/BCGov_Web_Map_Library.kml I can't pinpoint any changes to the computer setup which may have prompted this, however, adding arcgis 10.1 SP 1 occured around the same time. Probably just a coincidence. Anyone had similar problems? or solutions to these? Thanks for any thoughts. Jim

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• Keeping folder of files in sync over 3 machines

  - by Wizzard

  Morning, Got 3 machines that have user content on them, which I need to keep in sync. This is a 3 way sync. Currently I run rsync but we just don't handle deletes. Have looked at something like gluster, but that seems a little over the top Any other software out there to do a 3 way sync, or a good network file system...? There is for web servers so we don't want a slow / IO hungry process. 3 servers... user content could be added to 1 and needs to be moved to other two.

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• Why does my flash video get stuck? (not lag?)

  - by Sk606

  After moving to Ubuntu 10.10 Netbook Edition, I've noticed a strange problem that manifests itself most obviously with streaming videos like youtube and hulu. The video will load and begin playing fine and eventually stop, as though it is buffering. However, it usually happens between 40 and 60 seconds into the clip. The loading indication however shows that it actually isn't buffering anymore of the data, and will just sit there. If I force the clip forward (e.g. click to start the movie somewhere ahead of the stall point) the clip will usually reload quickly and begin playing as expected. Because of the quick load times, and the consistent stop of video, I don't think the problem is related to hardware performance or network throughput. Also, I have none of these problems in 10.04. Rebooting into 10.04 makes the problem disappear. However, one more clue, I also have noticed a higher occurrence of web pages that simply "stop loading" - say, 1/10 clicks while browsing I have to hit "reload" to get the page to load because the page timed out part of the way through. This seems strangely related to the video problem, though is a lot less infuriating. Help! Where do I begin to look with a problem like this?

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• What if any free video player for windows can I set a custom frame buffer for streaming over the wifi?

  - by user268883

  I currently use DAUM PLayer (Pot Player) but I have problems streaming video to my laptop unless it is plugged into the network. An easy fix (so I thought) would be to find a player were I could adjust the cache / buffer so say 5 mins+ is read to the local Hdrive and then played from there... I can not work out how to do this in any player I have VLC, MPCHC and DAUM installed. All I want to do is increase the file buffer so X amount of the networkfile is copied to the local drive and then played... so all stuttering is stopped? How do I do this?

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• Cannot connect Solaris 10 to Windows 7

  - by user999353

  I'm trying to connect a Solaris VM (powered by VMware Player) to Windows Explorer in Windows 7. When I try to map the network drive I get the following: The specified server cannot perform the requested operation. I am using the following URL which has worked on a machine I used before. The only thing that has changed is the IP address of the Solaris machine. I am able to connect to the VM via putty. \\1.2.3.4\xxx\yyy I checked and I think samba is running.. root 375 1 0 09:53:39 ? 0:00 /usr/sfw/sbin/smbd -D root 376 375 0 09:53:40 ? 0:00 /usr/sfw/sbin/smbd –D Anyone any ideas?

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