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How would I setup iMail to forward a user's mail to another service w/o leaving a copy locally?

- by Scott Mayfield

I have an iMail 2006 server installation in which I have a particular user that has several aliases that all point to a single user (me, for the record). I've been copying all of my mail to GMail and reading it there, but it annoys me that I have to go back weekly and log into my mail account on iMail and delete between 6 and 10 thousand copies of messages I've already received, in order to keep my mailbox from filling up (yes, I have it set with no quota, but I consider it bad form to just let the box grow indefinitely). I've got the copying setup via an inbound user rule, but I'm wondering how to accomplish a "copy and delete" rule. The manual isn't clear on what happens with multiple matching rules (will they be processed in order, or is it a first match situation?) and there isn't a means to combine multiple actions into a single rule. If I use the "forward" action, I THINK that it's going to screw up all the sender information once the mail reaches my GMail account and show it as coming from me instead of the original senders (can anyone confirm that this is accurate?) An easy answer would be to delete my user account entirely, replace it with an alias that maps to my GMail account, but then I would lose my ability to log into the system for admin duties. So that leads me to creating a second, lesser known account for admin use, but since it's a real account, sooner or later I'm going to get mail sent to it and I'll be back to the same situation of having a user account that doesn't get emptied periodically. I imagine I can set the quota to 0 MB to cause all incoming mail to my admin account to bounce, or setup an inbound rule to bounce everything, but this is starting to sound kludgy to me. Does anyone know of a more direct work around to copying a user's incoming mail to an outside server and then deleting the local copy w/o removing their account entirely? Or is this just wishful thinking? Thanks in advance. Scott

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How to stop my VPS from picking up ARP reqs it is not supposed to?

- by Charles Stewart

Machine: Xen-3.0 image running stable Debian Linux 2.6.18, pretty vanilla. My VPS provider asks me to deal with some trouble my image is causing, namely handling IP addresses it is not supposed to: The problem is that your server seems to be configured to use IPs that have not been appointed to you. Your server responds to ARP requests for the IPs 81.171.111.219 and 81.171.111.218. But you are not allowed to use those. Not explicitly, as far as I can tell! At least, nothing under /etc or /var/tmp mentions these IP addresses. But arp -v says something I can't make sense of: Address HWtype HWaddress Flags Mask Iface 81.171.111.1 ether 00:0C:DB:E3:80:00 C eth0 Entries: 1 Skipped: 0 Found: 1 What is it listening to? The possibilities seem to be: It's not my fault: my VPS providers have overlooked something. What might that be? 81.171.111.1 means I'm happy listening in on ARP requests that I shouldn't be: how do I change this? In any case, what does this mean? I'm looking in completely the wrong place for information on what my image is doing. Where should I be looking?

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Suggestions on the best home server rack cabinet

- by allentown

I have a lot of gear in a colocation facility right now. Some of it is going to come home with me now. I do not know anything about the "rack mount" side of the industry. I lease a rack, and I put my stuff in it. I have a few 1U boxes, a few 2U boxes, and a few 4U boxes. 1U switch. One is a new Xserve, which means it is deep. I think I can get by with around 12U to 18U. I want to keep it as small as possible, since I do not have a lot of spare space at my home. I will not be able to bolt to the wall, floor etc, so it should not be tall. This is something I would love to more or less just be a box that sits on the floor but gives me the ability to mount nicely, do nice cable management etc. Are the "post" style racks junk? I am liking the open space, and the no limitations on depth of something like this: http://www.rackmountsolutions.net/images/products/Martin-relay-rack.jpg However, that thing is way too tall, and probably way too expensive. I am looking to be around $300.00 or less. More if I have to, though I would prefer not to. These look near perfect: (See comment for this link, the system will not let me post a second url) but I am worried the Xserve will not fit in it. If anyone has any good links, or website recommendations of good past experience, I would appreciate it. I am almost considering that I may be able to build something with random scraps of stuff at Home Depot as well.

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What does this error mean in my IIS7 Failed Request Tracing report?

- by Pure.Krome

Hi folks, when I attempt to goto any page in my web application (i'm migrating the code from an asp.net web site to web application, and now testing it) .. i keep getting some not authenticated error(s) . So, i've turned on FREB and this is what it says... I'm not sure what that means? Secondly, i've also made sure that my site (or at least the default document which has been setup to be default.aspx) has anonymous on and the rest off. Proof: - C:\Windows\System32\inetsrv>appcmd list config "My Web App/default.aspx" -section:anonymousAuthentication <system.webServer> <security> <authentication> <anonymousAuthentication enabled="true" userName="IUSR" /> </authentication> </security> </system.webServer> C:\Windows\System32\inetsrv>appcmd list config "My Web App" -section:anonymousAuthentication <system.webServer> <security> <authentication> <anonymousAuthentication enabled="true" userName="IUSR" /> </authentication> </security> </system.webServer> Can someone please help?

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How do i set up a fully featured small business network?

- by JoshReedSchramm

This has the possibility to be a very large question but I recently acquired a few rack mount servers and the hardware necessary to run them. Unfortunately I'm a programmer with very little understanding of how to set up a good working network so I'm hoping someone on here might be able to help. What I want to do is run a domain with a series of subdomains which would all be externally accessible. The setup would live inside my home and my internet connection is your run of the mill cable model (which means a dynamic IP) I want to be able to set up a couple site, specifically: www.mycompany.com (mycompany.com with no subdomain would redirect to this) build.mycompany.com (for my continuous integration server) ruby.mycompany.com (for ruby projects) win.mycompany.com (for windows project) etc. Additionally this is still my home network so our personal machines need to be able to get on via wifi with at least the same security we have now through an out of the box router from best buy. I'm thinking i need a DNS server, DHCP server and one of those would run either no-ip or dyndns to accommodate the dynamic ip. I don't necessarily need mail but it might be helpful to have some sort of mail server i could use for testing, it doesn't need to get out to the greater internet though. So how do i set up this kinda of network? tl;dr Need to know how to set up your standard office style network in my home off my normal consumer level cable modem connection.

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DNS Round-robin, Load Balancing, Load sharing, and failover in 2012

- by user1089770

I have been reading many posts on serverfault as well as on other sites regarding all these. What I understand is, Multiple A records(round-robin dns) can be used for both : Load sharing (round-robin, but NOT load-balancing). Many people say that “Load Balancing” but I think there will be no load-balancing because “Balance” means (literally) “compare two(or more) and adjust” (and that is what Real s/w or h/w Load balancers do) but Browsers never do this, instead they randomly select and IP and connect to it. It doesn't have any knowledge about the current load of that server (probably, the IP it picked had the highest load!). Automatic failover (latest browsers only). Yes, I think DNS can be used as a simple failover system (at least in 2012, I dont know when it actually "came in effect"). please refer to : http://webmasters.stackexchange.com/questions/10927/using-multiple-a-records-for-my-domain-do-web-browsers-ever-try-more-than-one and Browser-based DNS failover using multiple A records and http://www.nber.org/sys-admin/dns-failover.html I would like to make sure my assumptions/findings are right. So let me know please.....

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NTDS Replication Warning (Event ID 2089)

- by Chris_K

I have a simple little network with 3 AD servers in 2 sites. Site A has Win2k3 SP2 and Win2k SP4 servers, site B has a single Win2k3 SP2 server. All have been in place for at least 3 years now. Just last week I started getting Event 2089 "not backed up" warnings (example below) on both of the win2k3 servers. I understand what the message means, no need to send me links to the technet article explaining it. I'll improve my backups. What I'm more curious about is why did I just start getting this message now? Why haven't I been getting it for the past 3 years?!? Perhaps this is related: I recently decommissioned a few other sites and AD controllers (there used to be 3 more sites, each with their own controller). Don't worry, I did proper DCpromo exercises and made sure we didn't lose anything. But would shutting those down possibly be related to why I get this error now? This won't keep me awake at night but I am curious as to what changed... Event Type: Warning Event Source: NTDS Replication Event Category: Backup Event ID: 2089 Date: 3/28/2010 Time: 9:25:27 AM User: NT AUTHORITY\ANONYMOUS LOGON Computer: RedactedName Description: This directory partition has not been backed up since at least the following number of days. Directory partition: DC=MyDomain,DC=com 'Backup latency interval' (days): 30 It is recommended that you take a backup as often as possible to recover from accidental loss of data. However if you haven't taken a backup since at least the 'backup latency interval' number of days, this message will be logged every day until a backup is taken. You can take a backup of any replica that holds this partition. By default the 'Backup latency interval' is set to half the 'Tombstone Lifetime Interval'. If you want to change the default 'Backup latency interval', you could do so by adding the following registry key. 'Backup latency interval' (days) registry key: System\CurrentControlSet\Services\NTDS\Parameters\Backup Latency Threshold (days) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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How can I unregister a service with dns-sd?

- by Roman

I am trying to use "dns-sd" command line tool on my Windows 7 machine. I can already do something. For example I can register a service using "dns-sd -R ...". I also can browser (see) registered services using "dns-sd -B ...". What I still miss, is how to unregister a service. At the moment when I type "dns-sd -R ..." the dns-sd does not return me to the command prompt. To return to the command prompt I need to press Ctrl-C. And the service stays registered till I press Ctrl-C. What I want is to run "dns-sd -R ..." in the background regime and then I would like to have a possibility to unregister a service from the command line. One more thing which I do not understand yet is what "to look up a service" means. In my picture it should be sufficient to register a service, to see it and then to unregister it. But apparently I need to look up a service. What does it mean and why I need to do it?

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Looking for an application to record audio and video on a linux "embedded" device

- by Luke404

I am working with a linux x86 device with limited CPU resources (as a prototype we just use a pentium-m netbook). We'd like to record video from one V4L2 device (we'll probably end up using just USB Video Class devices like all modern webcams) and one audio stream from an ALSA source. The thing will not have screen and keyboard, and obviously no X11 environment. Goals are: do as little work as possible to cope with little cpu resources - for example I'd like to record video in the native MJPEG I get out of the UVC devices encoding audio to MPEG3 Layer-2 (aka mp2) is ok since it let us save a lot of space (compared to raw pcm samples) and does use little cpu power I don't mind loosing some video frames here and there (UVC devices do that) as long as I can get audio and video streams syncronized not require user input to start the thing (a python script takes care of initialization, startup, shutdown, etc...) be able to open the resulting files for postprocessing without too much effort (ie, if mplayer or vlc can play it, it's fine) So far the only app I found that could be started from command line and record V4L2 video + ALSA audio is mencoder but I'm having some difficulties with it. It should be able to do that but I cannot record audio and video together - just one of the two. And if I use two different processes to record to two different files I have no means to get them in sync (audio is more or less always correct, but video framerate will vary over time and it seems to lack timestamps to correctly play it back to the correct time). Long story short, how do you record an unconverted MJPEG stream (from an UVC device) and an audio stream (from an ALSA device, possibly encoding to any standard format) using a command line tool, to a single file (MPEG or any other container), keeping audio and video in sync?

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How to configure mod_proxy_balancer to gracefully fail under high load

- by bramp

We have a system which has one Apache instance in front of multiple tomcats. These tomcats then connect to various databases. We balance the load to the tomcat with mod_proxy_balancer. Currently we are receiving 100 requests a second, the load on the Apache server is quite low, but due to database heavy operations on the tomcats, the load there is roughly 25% (of what I estimate they can handle). In a few weeks there is an event happening and we estimate that our requests will jump significant, maybe by a factor of 10. I'm doing everything I can do reduce the load on our tomcats, but I know we are going to run out of capacity, so I would like to fail gracefully. By this I mean, instead of trying to deal with too many connections which all timeout, I would like Apache to somehow monitor average response time, and as soon as the response time to Tomcat is getting above some threshold, I would like a error page displayed. This means that users who are lucky still get a page rendered quickly, and those who are unlucky get a error page quickly. Instead of everyone waiting far too long for their page, and eventually everyone timing out, and the database being swamped with queries which are never used. Hopefully this makes sense, so I was looking for suggestions on how I could achieve this. thanks

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Adding Netem Filter Rules

- by fontsix

iam new in programming and using linux. My Question is, is it possible to add Netem Filter Rules later ? I want to create an PHP-Interface for Netem and I don't know how much filters were required. This should be some kind of dynamically. In Example : A user with a static IP starts an Netem Command (Latency) with PHP Interface this means these five command werde executed by php in the first step $classid = 11; $handle = 10; "sudo tc qdisc add dev eth0 handle 1: root htb"; "sudo tc class add dev eth0 parent 1: classid 1:1 htb rate 100Mbps"; "sudo tc class add dev eth0 parent 1:1 classid 1:$classid htb rate 100Mbps"; "sudo tc qdisc add dev eth0 parent 1:$classid handle $handle: netem delay 100ms"; "sudo tc filter add dev eth0 protocol ip parent 1:0 prio 3 u32 match ip dst $dest flowid 1:$classid"; Now, if there would be a second user who wants to use Netem independent of the first user, i only want to execute the last 3 commands, like "sudo tc class add dev eth0 parent 1:1 classid 1:$classid htb rate 100Mbps"; "sudo tc qdisc add dev eth0 parent 1:$classid handle $handle: netem delay 100ms"; "sudo tc filter add dev eth0 protocol ip parent 1:0 prio 3 u32 match ip dst $dest flowid 1:$classid"; There is an Algorithmus for increasing variables $classid and $handle. This should work. Now my Question: Is it possible only to add these 3 commands to add a new class with new qdisc and a new filter rule ? Or how can i realize it ? The Apache Error_log tells me "sh: line 1: flowid: command not found" but i can't find any mistake. I hope you could help Best regards fontsix

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Hyper-V Virtual Machine won't respond over network

- by Brad Gignac

Recently, one of our Hyper-V virtual machines has periodically stopped responding over the network. It seems to be happening every few days, and it occasionally happens up to several times a day. I am by no means a sysadmin, so any direction you guys could provide would be very welcome. I've included everything I know to include below. If you need any additional information, I'll be glad to include it. I can connect through the Hyper-V console. I can't connect to network shares, IIS web apps, using RDP, or using ping. Memory usage seems to be normal (3 of 4 GB) Processor usage seems low. We don't know the exact time the server goes down, but the following error appears consistently around the time it goes down: Error 5719, NETLOGON This computer was not able to set up as secure session with a domain controller in domain *** due to the following: There are currently no logon servers available to service the logon request. This may lead to authentication problems. Make sure that this computer is connected to the network. If this problem persists, please contact your domain administrator.

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DPM 2007 clashing with existing SQL backup job

- by Paul D'Ambra

I've recently installed a DPM2007 server on Server 2003 and have set up a protection group against a server 2003 server running SQL 2005 SP3. The SQL server in question has a full backup (as a sql agent job) once a day and transaction log backups hourly. These are zipped up and FTP'd to a server offsite by a scheduled task. Since adding the DPM job I'm receiving many error messages: DPM tried to do a SQL log backup, either as part of a backup job or a recovery to latest point in time job. The SQL log backup job has detected a discontinuity in the SQL log chain for database SERVER_NAME\DB_Name since the last backup. All incremental backup jobs will fail until an express full backup runs. My google-fu suggests that I need to change the full backup my sqlagent job is running to a copy_only job. But I think this means that I can't use that backup with the transaction_logs to restore the database if the building (including the DPM server) burns down. I'm sure I'm missing something obvious and thought I'd see what the hivemind suggests. It is an option to set-up a co-located DPM server elsewhere and have DPM stream the backup but that's obviously more expensive than the current set up. Many thanks in advance

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Apache showing 500 error during Active Directory LDAP authentication

- by Tyllyn

I have Apache (on Windows Server) set up to authenticate one directory through Active Directory. Config settings are as follows: <LocationMatch "/trac/[^/]+/login"> Order deny,allow Allow from all AuthBasicProvider ldap AuthzLDAPAuthoritative Off AuthLDAPURL ldap://<ip-redacted>:3268/cn=Users,OU=MyBusiness,DC=<dc-redacted>,DC=local?sAMAccountName?sub?(objectClass=*) AuthLDAPBindDN trac@<dc-redacted>.local AuthLDAPBindPassword "<password-redacted>" AuthType Basic AuthName "Protected" require valid-user </LocationMatch> Watching, Wireshark, I see the following get sent through when I visit the page: To the AD server: bindRequest(1) "trac@<dc-redacted>.local" simple And from the AD server: bindResponse(1) success I'm assuming this means that the auth was successful... but Apache doesn't think so. It returns a 500 server to me. Apache logs show the following: [Thu Nov 18 16:21:12 2010] [debug] mod_authnz_ldap.c(379): [client 192.168.x.x] [7352] auth_ldap authenticate: using URL ldap://<ip-redacted>:3268/cn=Users,OU=MyBusiness,DC=<dc-redacted>,DC=local?sAMAccountName?sub?(objectClass=*), referer: http://192.168.x.x/trac/Trac/login [Thu Nov 18 16:21:12 2010] [info] [client 192.168.x.x] [7352] auth_ldap authenticate: user authentication failed; URI /trac/Trac/login [ldap_search_ext_s() for user failed][Filter Error], referer: http://192.168.x.x/trac/Trac/login Now, that log file shows a failed auth for a blank user. I am confused. Any idea what I am doing wrong... and how I can get the Apache authentication working? :) Thanks!

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Errors in Homebrew on OS X Lion

- by Bo Tian

I just ran the Homebrew script as described in the installation page. I then ran brew doctor in Terminal, and it returned several errors. I'm not sure how to fix those errors, please help. brew doctor Error: Some directories in /usr/local/share/man aren't writable. This can happen if you "sudo make install" software that isn't managed by Homebrew. If a brew tries to add locale information to one of these directories, then the install will fail during the link step. You should probably `chown` them: /usr/local/share/man/de /usr/local/share/man/de/man1 Error: You have Xcode 4.2, which is outdated. Please install Xcode 4.3. Error: Unbrewed dylibs were found in /usr/local/lib. If you didn't put them there on purpose they could cause problems when building Homebrew formulae, and may need to be deleted. Unexpected dylibs: /usr/local/lib/libcdt.5.dylib /usr/local/lib/libcgraph.6.dylib /usr/local/lib/libgraph.5.dylib /usr/local/lib/libgvc.6.dylib /usr/local/lib/libgvpr.2.dylib /usr/local/lib/libpathplan.4.dylib /usr/local/lib/libxdot.4.dylib Error: Unbrewed .pc files were found in /usr/local/lib/pkgconfig. If you didn't put them there on purpose they could cause problems when building Homebrew formulae, and may need to be deleted. Unexpected .pc files: /usr/local/lib/pkgconfig/libcdt.pc /usr/local/lib/pkgconfig/libcgraph.pc /usr/local/lib/pkgconfig/libgraph.pc /usr/local/lib/pkgconfig/libgvc.pc /usr/local/lib/pkgconfig/libgvpr.pc /usr/local/lib/pkgconfig/libpathplan.pc /usr/local/lib/pkgconfig/libxdot.pc Error: /usr/bin occurs before /usr/local/bin This means that system-provided programs will be used instead of those provided by Homebrew. The following tools exist at both paths: 2to3 Consider amending your PATH so that /usr/local/bin is ahead of /usr/bin in your PATH.

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Turn off monitor (energy saving) while in text console mode (in Linux)

- by Denilson Sá

How to configure Linux text console to automatically turn of the monitor after some time? And by "text console" I mean that thing that you get on ctrl+alt+F[1-6], which is what you get whenever X11 is not running. And, no, I'm not using any framebuffer console (it's a plain, good and old 80x25 text-mode). Many years ago, I was using Slackware Linux, and it used to boot up in text-mode. Then you would manually run startx after the login. Anyway, the main login "screen" was the plain text-mode console, and I remember that the monitor used to turn off (energy saving mode, indicated by a blinking LED) after some time. Now I'm using Gentoo, and I have a similar setup. The machine boots up in text-mode, and only rarely I need to run startx. I say this because this is mostly my personal Linux server, and there is no need to keep X11 running all the time. (which means: I don't want to use GDM/KDM or any other graphical login screen) But now, in this Gentoo text-mode console, the screen goes black after a while, but the monitor does not enter any energy-saving mode (the LED is always lit). Yes, I've waited long enough to verify this. Thus, my question is: how can I configure my current system to behave like the old one? In other words, how to make the text console trigger energy-saving mode of the monitor? (maybe I should (cross-)post this question to http://unix.stackexchange.com/ )

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Conditionally permitting HTTP-only requests to Tomcat?

- by Mike

I have 2 versions of a system: Tomcat webserver Nginx reverse-proxy sitting in front of a tomcat webserver. In version 2, nginx only ever talks to Tomcat over HTTP. A user could configure the system so that only HTTPS requests are allowed. If the user does this in Version 1 and then the XML configuration files for Tomcat takes care of this. In version 2, nginx takes care of this. The problem is this: I cannot force a user to update their Tomcat XML config files when they upgrade from version 1 to version 2 (it will be recommended that they do so) because this is done as part of a larger process. This means that if they upgrade and don't update the Tomcat config, an HTTPS request will arrive at nginx, which will proxy it over HTTP to Tomcat which will reject the request because it is not HTTPS. So I can't force an update to the Tomcat XML, and I have to use HTTP between nginx and Tomcat. Any ideas? Is there some way I can affect how Tomcat reads its config in Version 2 so that it ignores the HTTPS-only section?

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Do any well-known CAs issue Elliptic Curve certificates?

- by erickson

Background I've seen that Comodo has an elliptic curve root ("COMODO ECC Certification Authority"), but I don't see mention of EC certificates on their web site. Does Certicom have intellectual property rights that prevent other issuers from offering EC certificates? Does a widely-used browser fail to support ECC? Is ECC a bad fit for traditional PKI use like web server authentication? Or is there just no demand for it? I'm interested in switching to elliptic curve because of the NSA Suite B recommendation. But it doesn't seem practical for many applications. Bounty Criteria To claim the bounty, an answer must provide a link to a page or pages at a well-known CA's website that describes the ECC certificate options they offer, prices, and how to purchase one. In this context, "well-known" means that the proper root certificate must be included by default in Firefox 3.5 and IE 8. If multiple qualifying answers are provided (one can hope!), the one with the cheapest certificate from a ubiquitous CA will win the bounty. If that doesn't eliminate any ties (still hoping!), I'll have to choose an answer at my discretion. Remember, someone always claims at least half of the bounty, so please give it a shot even if you don't have all the answers.

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Tomcat Solr times out

- by user568458

(Plesk 10.4 centos 5.8 linux apache2 server, with Tomcat5 on port 8080 and Apache Solr) I get "The connection has timed out" on requesting domain.com:8080 or www.domain.com:8080 or ip.ad.dr.ess:8080 Every reason I can find why this might be seems not to be the case: Plesk thinks Tomcat is running fine and lists it as an active service. The firewall currently has an accept all rule on port 8080. There's nothing relevant in the catalina tomcat logs (/var/log/tomcat5) - just some stuff from last time tomcat was started. There's no record at all of the requests that fail. netstat -lnp | grep 8080 gives the following, which I beleive means Tomcat is listening to requests to port 8080 on all ip addresses from any ip and any port (please correct me if I'm wrong): : tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN 4018/java This covers every cause of this time out that I can find - so I must be missing something fundamental. It seems Tomcat is running, listening to the right port, is getting an appropriate IP address, is not obstructed by a firewall and is not failing after receiving a request in a way which would be recorded in the logs (so I believe it can't be out of memory, or anything like that). I'm all out of ideas on how to continue debugging this. I must have overlooked something obvious. Can anyone help?

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Triple monitor setting in Linux with USB-HDMI adapter

- by Oscar Carballal

I'm trying to set up a triple monitor desktop at my office using Fedora 17, but it seems impossible, let me explain the setting: Laptop ASUS K53SD with 2 graphic cards, Intel and nVidia (Screen controled by Intel card) 24" Full HD monitor connected to the HDMI output (controlled by Intel card) 23" Full HD monitor connected to an USB-HDMI adapter (via framebuffer in /dev/fb2, apparently) VGA output (not used) controlled by nVidia card First of all, the USB-HDMI adapter works perfectly, it gives me a green screen (which means the communication is OK) and I can make it work if I set up a single monitor setting via framebuffer in Xorg. Here I leave the page where I got the instructions: http://plugable.com/2011/12/23/usb-graphics-and-linux Now I'm trying to set up the the two main monitors (laptop and 24") with the intel driver and the 23" with the framebuffer, but the most succesful configuration I get is the two main monitors working and the third disconnected. Do you have any idea what can I do to make this work? Here I leave my xRandr output and my Xorg conf: -> xrandr Screen 0: minimum 320 x 200, current 3286 x 1080, maximum 8192 x 8192 LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 193mm 1366x768 60.0*+ 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA2 disconnected (normal left inverted right x axis y axis) HDMI1 connected 1920x1080+1366+0 (normal left inverted right x axis y axis) 531mm x 299mm 1920x1080 60.0*+ 50.0 25.0 30.0 1680x1050 59.9 1680x945 60.0 1400x1050 74.9 59.9 1600x900 60.0 1280x1024 75.0 60.0 1440x900 75.0 59.9 1280x960 60.0 1366x768 60.0 1360x768 60.0 1280x800 74.9 59.9 1152x864 75.0 1280x768 74.9 60.0 1280x720 50.0 60.0 1440x576 25.0 1024x768 75.1 70.1 60.0 1440x480 30.0 1024x576 60.0 832x624 74.6 800x600 72.2 75.0 60.3 56.2 720x576 50.0 848x480 60.0 720x480 59.9 640x480 72.8 75.0 66.7 60.0 59.9 720x400 70.1 DP1 disconnected (normal left inverted right x axis y axis) 1920x1080_60.00 60.0 The Xorg file: # Xorg configuration file for using a tri-head display Section "ServerLayout" Identifier "Layout0" Screen 0 "HDMI" 0 0 Screen 1 "USB" RightOf "HDMI" Option "Xinerama" "on" EndSection ########### MONITORS ################ Section "Monitor" Identifier "USB1" VendorName "Unknown" ModelName "Acer 24as" Option "DPMS" EndSection Section "Monitor" Identifier "HDMI1" VendorName "Unknown" ModelName "Acer 23SH" Option "DPMS" EndSection ########### DEVICES ################## Section "Device" Identifier "Device 0" Driver "intel" BoardName "GeForce" BusID "PCI:0:02:0" Screen 0 EndSection Section "Device" Identifier "USB Device 0" driver "fbdev" Option "fbdev" "/dev/fb2" Option "ShadowFB" "off" EndSection ############## SCREENS ###################### Section "Screen" Identifier "HDMI" Device "Device 0" Monitor "HDMI1" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection Section "Screen" Identifier "USB" Device "USB Device 0" Monitor "USB1" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection

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TCP Handshake and port numbers

- by Guido

(I have a question about the TCP handshake and how port numbers are assigned, if this does not belong here, let me know.) Hi, I'm studying TCP/IP from the book "Internetworking with TCP/IP" by Douglas Comer. In the TCP chapter it mentions that TCP defines an "endpoint" as a pair (IP address, port number), and a connection is defined by two endpoints. This has a few implications, such as, a local TCP port could be in several connections at once, as long as there are no two from the same IP and the same remote port. This also means that the amount of established connections is almost limitless (2^16 for every IPv4 address. 2^48 in total). Now, in class, I was told that when one connects to a listening port, both sides agree on a different port to use, so the communication can happen and the listener socket remains free. This was also my belief before reading the book. Now I feel like I should obviously trust the book (It's Comer!), but is there any truth to the other explanation? Thanks

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Looking for a recommendation on measuring a high availability app that is using a CDN.

- by T Reddy

I work for a Fortune 500 company that struggles with accurately measuring performance and availability for high availability applications (i.e., apps that are up 99.5% with 5 seconds page to page navigation). We factor in both scheduled and unscheduled downtime to determine this availability number. However, we recently added a CDN into the mix, which kind of complicates our metrics a bit. The CDN now handles about 75% of our traffic, while sending the remainder to our own servers. We attempt to measure what we call a "true user experience" (i.e., our testing scripts emulate a typical user clicking through the application.) These monitoring scripts sit outside of our network, which means we're hitting the CDN about 75% of the time. Management has decided that we take the worst case scenario to measure availability. So if our origin servers are having problems, but yet the CDN is serving content just fine, we still take a hit on availability. The same is true the other way around. My thought is that as long as the "user experience" is successful, we should not unnecessarily punish ourselves. After all, a CDN is there to improve performance and availability! I'm just wondering if anyone has any knowledge of how other Fortune 500 companies calculate their availability numbers? I look at apple.com, for instance, of a storefront that uses a CDN that never seems to be down (unless there is about to be a major product announcement.) It would be great to have some hard, factual data because I don't believe that we need to unnecessarily hurt ourselves on these metrics. We are making business decisions based on these numbers. I can say, however, given that these metrics are visible to management, issues get addressed and resolved pretty fast (read: we cut through the red-tape pretty quick.) Unfortunately, as a developer, I don't want management to think that the application is up or down because some external factor (i.e., CDN) is influencing the numbers. Thoughts? (I mistakenly posted this question on StackOverflow, sorry in advance for the cross-post)

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qsub: How can I find out what DRM middleware exactly is installed on a cluster?

- by gojira

I have a user account on a very big cluster. I have previous experience with Grid Engine and want to use the cluster for array jobs. The documentation tells me to use "qsub" for load balancing / submission of many jobs. Therefore I assumed this means the cluster has Grid Engine. However all my Grid Engine scripts failed to run. I checked the documentation and it is a bit weird. Now I slowly suspect that this cluster does not actually have Grid Engine, maybe it's running something called Torque (?!). The whole terminology in the man pages is a bit weird for me as a Grid Engine user, for example they talk about "bulk jobs" instead of "array jobs". There is no referral to variables on which I rely on, like SGE_TASK_ID etc. Instead they refer to variables starting with PBS_. Still, there are qsub and qstat commands. Also qsub behaves differently, apparently it is not possible to specifiy the command line parameters with bash-script comments etc. There is a documentation for the cluster system, but it does not say what the DRM middleware actually is - it refers to the entire DRM system simply as "qsub". I tried qsub --version qsub: 1.2 2010/8/17 I am not sure what I am actually running when I invoke qsub on that cluster! My question is, how can I find out if I am running Grid Engine or Torque (or whatever it is), and which version?

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Bypassing SQUID on freebsd with PF

- by epema

I have PF+SQUID31 on FREEBSD-9.0, and I want to have some hosts(aka goodguys) to bypass the proxy, so that torrents are not logged. Also, I am not sure about transparent. It means that I dont have to configure proxy settings on the client side right? I have tried doing a redirect no rdr on $int_if inet proto {tcp,udp} from 192.168.1.233/32 to any However, no luck :( Here is a quick look of my conf files: SQUID /usr/local/etc/squid/squid.conf http_port 192.168.1.1:8080 transparent RC /etc/rc.conf: gateway_enable="YES" pf_enable="YES" pf_rules="/usr/local/etc/pf.conf" pflog_enable="YES" squid_enable="YES" I have squid31 installed from ports with SQUID_PF "Enable transparent proxying with PF" on PF /usr/loca/etc/pf.conf: int_if="re0" ext_if="bge0" localnet="{ 192.168.1.0/24 }" table <goodguys> const { "192.168.1.219", "192.168.1.233" } set block-policy drop set skip on lo0 scrub in all fragment reassemble scrub out all random-id max-mss 1440 block in on $ext_if pass out on $ext_if keep state block in on $int_if pass in on $int_if inet proto tcp from $int_if:network to $int_if port 8080 keep state pass in on $int_if inet proto udp from $int_if:network to $int_if port 21 keep state pass in on $int_if inet proto udp from $int_if:network to $int_if port 22 keep state pass in on $int_if inet proto udp from $int_if:network to $int_if port 53 keep state pass in on $int_if inet proto tcp from $int_if:network to any port { smtp, pop3 } keep state pass in on $int_if inet proto icmp from $int_if:network to $int_if keep state pass out on $int_if keep state What lines should I add in conf files? I am assuming that the problem is on the firewall(pf).

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In an environment with multiple WiFi access points, do wireless clients sometimes connect to both at the same time?

- by Bobby Burgess

This is more of a curiosity than a problem, but in this new office I have two D-link DAP-2553's connected in a master/slave array (this just means the master keeps certain configuration options aligned with the slave). The network is set to 802.11n-only, and each AP has the same SSID and WPA2 key. The only difference is that they are on different channels (1 and 11). The WiFi network itself is working well. Users can roam around and the signal/speed is fairly consistent. However, I notice that when I look at the 802.11 client list in the web admin page for each of the 2 APs, I see that certain clients are connected to both, for extended periods of time, but I assume they are only passing data through one of them. Not every client is seen on each AP, but at any given time the same MAC address of a WiFi adapter can be associated (and remain associated) with both APs. The client list auto-refreshes every few seconds so I believe I'm looking at the most recent rather than stale information. One of the WiFi adapters that consistently associates with both APs is an Intel Centrino Wireless-N 1030 (laptop chip). Is it part of the WiFi standard that more than one association per WiFi card can be established concurrently on separate APS?

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