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• Bacula optimization/profiling tools

  - by pufferfish

  I'm trying to get an idea of where the bottlenecks are in our backup system. Are there tools available for profiling this? If not, any pointers to a home grown method would also help. I guess most of the info would be in the bacula logs, but I'd also like to see things like what gets saturated during despooling: disk, CPU or network? This feels like a problem most bacula admins would have encountered.

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• How can I get the same SSID for multiple access points?

  - by krosenvold

  I need to upgrade my existing wireless infrastructure and this time I want 2 access points to cover my house, since I get blind spots no matter what with a single AP. I have physical cabling to my central network available for both access points. I would really like these two to interoperate seamlessly as a single SSID. How do I do this? What are the features that the new access points I'm buying would need to support?

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• Domain user cannot connect to Exchange

  - by Jeff

  I can login to the local PC and connect to Exchange server - on the same physical network if i log into the domain i cannot connect to the Exchange server. DNS / DHCP all functioning as expected. User has AD account with Domain Admin rights. Quite confusing!

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• Sycronizing/deploying scripts across several systems

  - by otto

  I have a few time consuming tasks that I like to spread across several computers. These tasks require running an identical ruby or python script (or series of scripts that call each other) on each machine. The machines will a separate config file telling the script what portion of the task to complete. I want to figure out the best way to syncronize the scripts on these machines prior to running them. Up until now, I have been making changes to a copy of the script on a network share and then copying a fresh copy to each machine when I want to run it. But this is cumbersome and leaves a chance for error ( e.g missing a file on the copy or not clicking "copy and replace"). Lets assume the systems are standard windows machines that are not dedicated to this task and I don't need to run these scripts all the time (so I don't want a solution that runs 24/7 and always keeps them up to date, I'd prefer something that pushes/pulls on command). My thoughts on various options: Simple adaptation of my current workflow: Keep the originals on the network drive, but write a batch file that copies over the latest version of the scripts so everything is a one-click operation. Requires action on each system, but that's not the end of the world (since each one usually needs their configuration file changed slightly too). Put everything in a Mercurial/Git reposotory and pull a fresh copy onto each node. Going straight to the repo from each machine would guarantee a current version (and would have the fringe benefit of allowing edits to the script to be made from any machine). Cons would be that it requires VCS to be installed on each machine and there might be some pains dealing with authentication since I wouldn't use a public repo. Open up write access on a shared folder and write a script to use rsync (or similar) to push the changes out to all of the machines at once. This gets a current version on every machine (though you would have to change the script if you want to omit a machine or add a new one). Possible issue would be that each computer has to allow write access. Dropbox is a reasonable suggestion (and could work well) but I dont want to use an external service and I'd prefer not to have to have dropbox running 24/7 on systems that would normally not need it. Is there something simple that I am missing? Some tool designed expressly for doing this kind of thing? Otherwise I am leaning toward just tying all of the systems into Mercurial since, while it requires extra software, it is a little more robust than writing a batch file (e.g. if I split part of a script into a separate module, Mercurial will know what to do whereas I would have to add a line to the batch file).

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• Wifi channel interference

  - by artfulrobot

  In my neighbourhood there are: 11 wifi signals on channel 1 2 wifi signals on channel 4 (including mine at the mo) 8 on channel 6 6 on channel 11 According to the diagram on wikipedia Mine on channel 4 will suffer interference from channel 1 and channel 6, so a total of 20 other networks(!). So would I be better to join channel 11, even though my network is then in direct competition with the 6 others? I suppose the question is: what's worse: direct interference (meaning that on the same channel) from 6 or fringe interference from many more networks?

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• What should the hostname/domain be when installing FreeBSD?

  - by Omu

  I am trying to configure a fresh installation of FreeBSD using VMware workstation. I get to a screen where I have to configure the Network Interfaces (some values are set automatically because I've selected DHCP Auto in options) but the hostname is empty and domainname is .localdomain. What values should I write in there?

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• HTTP Proxypass of subdomain

  - by enedebe

  I'm trying to install a proxy on my gateway that everything that comes from a subdomain for example sub.mydomain.com goes to an inside server at a :3000 port. I'm installing a redmine server inside my network that has to be reached from outside. Any idea of how to do that? I think in httpd as proxypass, but I don't know how to get just the subdomain name to proxy it. My gateway is currently Clearos machine. Thanks

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• Wake On LAN on request

  - by honzas

  Hi, I have a small home network with the router capable of running OpenWRT, is there some utility or firewall rule, which can be used to Wake On LAN on request. What I think - if I want to access my media centre (using for example SSH or HTTP) and it is suspended, is it possible to catch the ICMP packet (saying the machine is offline) and send the WOL packet to wakeup the machine and resend the SSH or HTTP request? Thanks

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• Toggle-able USB hub with more than one input and output?

  - by user74757

  I recently came across this product: http://ppa-usa.com/shared-network-hub-4-port-usb.html The only problem is, this is nearly opposite of what I need. Ideally, I'm looking for a USB hub-like device that can accept at least two devices for input, and toggle those two devices between at least 2 PC's. The hub linked above appears to be only able to accept one device. Does anyone know of such a product?

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• MS Word document randomly changes document filename from .doc to .tmp

  - by anD666

  Hiya, I am experiencing problems when opening some word documents. The filename will randomly automatically change to the temp file that is created whilst editing the document. MS Word is not crashing and it doesnt happen for everyone on our network that I know of. Can anyone shed some light on why it would do this? Thanks

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• Ubuntu X doesn't start

  - by den-javamaniac

  I'm running desktop Ubuntu 9.10 on my Dell laptop. Previously it was Ubuntu 9.04. After some period of time (lets say 3-4 months) my X fails to start automatically after some restart calls. If that takes place my network manager applet doesn't start either (after I do startx). Can any one point out what I'm missing/what's the problem?

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• Suggestion for software to control internet

  - by redknight

  I need to implement a gateway that will allow me to control the access to the internet of a network made up of a about half a dozen of workstations. My main obejectives are the following: 1- Monitoring of traffic 2- Logging of traffic 3- Access control - block websites (mainly adult) and certian traffic(example torrents) 4- Possibly cache content 5- Easy management interface 6- Preferable free and opensource Serverfault users can you please suggest from your vast experience which software you think is the best to suit my needs? Any suggestion is greatly appreciated. Thank you

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• How to re-run one line of a PowerShell cmdlet if it fails

  - by pansal

  I wrote a PowerShell script which is supposed to send emails automatically, but sometimes the email won't send out due to a network issue. Here is how I'm sending email: $smtp_notification.Send($mail_notification) Here are the error logs: Exception calling "Send" with "1" argument(s): "Failure sending mail." At line:1 char:24 + $smtp_notification.Send <<<< ($mail_notification) + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : DotNetMethodException Is there anyway to re-run the sending line when I met this failure? Can anyone give me some suggestions please?

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• Testifying rasing net.core.somaxconn 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. Does anyone know a method to testify this with two machines, sitting on a Gbit network? The best would be against MySQL, LVS, apache2 ( 2.2 ), memcached.

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• Windows 2003 Domain controller

  - by user40766

  I have a win 2K3 domain controller that has sudddenly started logging about 60 events a second. All events are ID 538, 540 and 576 All events pertain to Security Audit of the machine itself logging in successfully. a typical entry is Event Id 540 Successful Network Logon: User Name: <machinename>$ Any pointers to how I can diagnose this? CPU and memory are normal on the machine.

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• Accessing Internal Server from Outside through SSH

  - by myahya

  The issue is as follows: I am using Ubuntu Linux. I am working from home, and I need to access a PostgreSQL database severer within my company's network. Call the DB server X. For security reasons, only one machine can be accessed from the outside using ssh, call it Y. So the scenario is: Home <--SSH-- Y <----- X(DB) I think something like SSH forwarding (configured in .ssh/config) could help with this, but I am not sure how to do this, any ideas?

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• Ping issues with Windows Server 2008 R2 with mail server!

  - by S. M.

  For some reason I can ping all servers in my network except for the mail server and the mail server can ping all servers except the windows server 2008 R2. The firewall has been disabled and still it doesn't respond. The weird part is that every once in a while it will all of a sudden start allowing pings and then just as suddenly stop allowing pings. I've made sure there's no type-o's in the ip address or subnet mask or gateway. Any other ideas?

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• Tunneling traffic through a proxy using SSH - what does the proxy server see?

  - by nilu

  If I am accessing information (in a browser or via bittorent) through an SSH tunnel, what info will then be possible to obtain on the SSH/proxy server itself? As far as I have understood, the information between the proxy server and my computer is encrypted, but is it not possible for the SSH server admin to obtain info about the traffic? The SSH session requires my credentials, so my guess would be that the server admin would be able to obtain any information about my network usage.

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• Avoid Windows Explorer to load complete executable file

  - by eli.work

  On Windows Vista, when browsing to a network folder containing executables, Windows Explorer seems to load all the files completely just to be able to show the executable icon (the resource monitor indicates loads of traffic during the loading of the directory) On XP only a part of the file is loaded. Is there a way to avoid the complete loading of these files? Note that disabling my anti virus does not help.

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• isa 2006 blocks outgoing traffic with no rule specified

  - by codesnik

  I've created a rule near the top, allowing all outgoing traffic from "All Users" from specified IP range to external network. However, connections are blocked sometimes for no apparent reason. For example, one attempt to ssh to an external server would fail, and another immediatelly after that - won't. to the same server! logging shows thoose failed connections as denied, but "rule" column is blank. any suggestions?

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• what is technology behind bitTorrent?

  - by bvishal4u

  What is bitTorrent protocol, & techology behind it? What is difference between bitTorrent & Content Distribution Network?

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• what is technology behind bitTorrent?

  - by bvishal4u

  What is bitTorrent protocol, & techology behind it? What is difference between bitTorrent & Content Distribution Network?

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• Store ESX5 images on a NAS?

  - by Cylindric

  I have a basic NAS device (Buffallo LinkStation Duo) that can only present SMB fileshares to the network. For testing annd for getting a dying physical machine working I would like to store my VMDK on here. Is that possible, or will I have to find some way of presenting this as an iSCSI target of some sort? I've only used iSCSI or local storage in the past, but this isn't possible at the moment. Thanks.

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• Connect Ubuntu 11.04 to xbox 360

  - by mrK

  I'd like to be able to stream .avi files to my xbox 360 video library. I've gone through a bunch of different servers (ushare, xbmc) both from the aptitude and from source. It seems that I can get the servers working from both localhost and from another computer on the network. However, the xbox cannot detect any of these. Can anybody give me a hand or perhaps post a detailed walkthrough to give me a hand?

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• How to configure sendmail to relay through a specific server

  - by ErebusBat

  I have a tiny home server setup behind my cable modem (bresnan communications). I want to be able for this box to send out email (not receive) for notifications and whatnot. What I have already done: I have installed and configured sendmail. I have added mail.bresnan.net as my SMART_HOST directive. What I belive the problem is When I attempt to send an email I get the following in my mail log: Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: from=aburns, size=140, class=0, nrcpts=1, msgid=<[email protected]>, relay=aburns@localhost Dec 22 10:24:17 batcave sm-mta[1531]: oBMHOHWZ001531: from=<[email protected]>, size=397, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA-v4, relay=localhost [127.0.0.1] Dec 22 10:24:17 batcave sendmail[1530]: oBMHOHrs001530: to=<[email protected]>, ctladdr=aburns (1000/1000), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30140, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (oBMHOHWZ001531 Message accepted for delivery) Dec 22 10:24:18 batcave sm-mta[1517]: oBMH9mVv001357: to=<[email protected]>, ctladdr=<[email protected]> (1000/1000), delay=00:14:30, xdelay=00:00:42, mailer=relay, pri=300339, relay=pmx0.bresnan.net. [69.145.248.1], dsn=4.0.0, stat=Deferred: Connection timed out with pmx0.bresnan.net. You can see where the message is accepted for delivery by my sendmail server, then where it attempts to hand off to bresnan's server and it timesout. This is where my question is. Asstute readers will notice that pmx0.bresnan.net is not what I have my SMART_HOST directive set as. This is the (outside?) MX server for the bresnan.com/net domain. Apparently bresnan has their network configured so that you can not access this server from within their own network and instead must use the mail.bresnan.net server (which I can connect to). The problem is that I don't know how to tell sendmail to use this server and not the domain. What I have tried Setting a hosts entry so that the pmx0 server points to the mail IP address. This doesn't work, which makes sense as sendmail is obviously doing an MX query to find the server which returns the IP so there is never a need to do a 'normal' DNS resolve so the hosts file never gets involved.

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