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• lenovo x1 carbon windows 8 frequent wifi disconnect issue

  - by hIpPy

  I'm having frequent wifi disconnects on my Lenovo X1 Carbon Touch laptop. I got this laptop 2 months back and it has been happening ever since about 3-5 times a day and 10 times a week on average. I've Frontier Fios internet. Power connected or not does not matter. Once I get disconnected, I try below to connect again in that order: turn Airplane mode on and off, troubleshoot network problems windows troubleshooter), restart the laptop I'd find that the WiFi adapter would get disabled and sometimes windows troubleshooting would help but more than often I'd end up restarting the laptop. A week back, I upgraded my wifi network adapter drivers (now Intel, version 15.5.6.48, 10/3/2012). I still get disconnected frequently but turning Airplane mode on and off gets me connected again. So the driver update did help. Windows 8 is updated. None of the other devices (nexus, iphone phones, nexus7, ipad tablets) would have wifi issues when my laptop would get disconnected. config: Intel(R) Centrino(R) Advanced-N 6205 (WiFi network adapter) Microsoft Windows 8 Pro Microsoft Windows [Version 6.2.9200] x64-based PC LENOVO System Model: 3443CTO X1 Carbon Touch I recently noticed this log message When I got disconnected in event viewer: Your computer was not assigned an address from the network (by the DHCP Server) for the Network Card with network address 0x[XXXXXXXXXXXX]. The following error occurred: 0x79. Your computer will continue to try and obtain an address on its own from the network address (DHCP) server. Any idea?

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• Font display issue (Mac OS X)?

  - by avenas8808

  I used a font manager on Mac OS X, for additional fonts in my graphic design projects without installing them to the fonts folder (I think that's how it works) - using Font Book and Font Explorer X Version 1.2.3 on OS X 10.6. Most fonts work fine, but Interstate has a problem: Interstate Regular is installed, but for some reason it's probably not seeing it; it's seeing all the Bold and Condensed versions fine. In the above image, it displays the second font as Interstate Regular, but it isn't that font... why? Also, how do I reset the system fonts folder back to the default-installed fonts (I think it's in the library folder) if worst comes to worst, and is using a font manager on Mac or Windows a good idea? I don't want to wreck my system, fairly new to using Mac, especially OS X, so any help would be gratefully accepted.

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• Stop UAC/Secure Desktop from dimming the screen

  - by Florian

  I like the concepts of UAC and the "Secure Desktop" in Windows 7, but I don't like the dimming of the Secure Desktop to prompt for Admin credentials (or OK button to get clicked). However, dimming goes so far that my monitor regularly goes into PowerSaver mode, which is annoying (as it takes another 10 seconds for it to wake up), and might harm the monitor: two weeks after switching from XP to Windows 7, my 30" monitor stayed black and it had to get replaced. The web is full of tips how to turn off dimming, but that will always also turn off the "Secure Desktop". Is there a way to present the Secure Desktop without dimming? Or with a different visual effect to show that it is the Secure Desktop? EDIT: To clarify, I'm not looking for a way to disable dimming by disabling Secure Desktop (as is done by lowering the UAC level). I want to keep both UAC and Secure Desktop.

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• .htaccess, mod_rewrite Issue

  - by Shoaibi

  What i want: Force www [works] Restrict access to .inc.php [works] Force redirection of abc.php to /abc/ Removal of extension from url Add a trailing slash if needed old .htaccess : Options +FollowSymLinks <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / ### Force www RewriteCond %{HTTP_HOST} ^example\.net$ RewriteRule ^(.*)$ http://www\.example\.net/$1 [L,R=301] ### Restrict access RewriteCond %{REQUEST_URI} ^/(.*)\.inc\.php$ [NC] RewriteRule .* - [F,L] #### Remove extension: RewriteRule ^(.*)/$ /$1.php [L,R=301] ######### Trailing slash: RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_URI} !(.*)/$ RewriteRule ^(.*)$ http://www.example.net/$1/ [R=301,L] </IfModule> New .htaccess: Options +FollowSymLinks <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / ### Force www RewriteCond %{HTTP_HOST} ^example\.net$ RewriteRule ^(.*)$ http://www\.example\.net/$1 [L,R=301] ### Restrict access RewriteCond %{REQUEST_URI} ^/(.*)\.inc\.php$ [NC] RewriteRule .* - [F,L] #### Remove extension: RewriteCond %{REQUEST_FILENAME} \.php$ RewriteCond %{REQUEST_FILENAME} -f RewriteRule (.*)\.php$ /$1/ [L,R=301] #### Map pseudo-directory to PHP file RewriteCond %{REQUEST_FILENAME}\.php -f RewriteRule (.*) /$1.php [L] ######### Trailing slash: RewriteCond %{REQUEST_FILENAME} -d RewriteCond %{REQUEST_FILENAME} !/$ RewriteRule (.*) $1/ [L,R=301] </IfModule> errorlog: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://www.example.net/ Rewrite.log: http://pastebin.com/x5PKeJHB

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• rewrite redirect issue in debian squeeze

  - by hd01

  My server os is debian squeeze. I have these lines to redirect non-www to www in htaccess file of my website: RewriteCond %{HTTP_HOST} !^www\.example\.com$ [NC] RewriteRule ^(.*)$ http://www.example.com/$1 [L,R=301] but it cause this error in firefox: The page isn't redirecting properly Firefox has detected that the server is redirecting the request for this address in a way that will never complete. This problem can sometimes be caused by disabling or refusing to accept cookies. when I comment those lines in htaccess mysite appears but in non-www format. I'm sure it works well before on the Ubuntu . but I don't know why it doesn't work now. would you help me?

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• Setting Rails up on a Linode - Nginx Issue

  - by rctneil

  I am extremely new to this so please don't shoot me down: I have set up a Linode running Ubuntu, It is all sort of working except Nginx. I am following this guide: http://rubysource.com/deploying-a-rails-application/ And this for nginx: http://library.linode.com/web-servers/nginx/installation/ubuntu-10.04-lucid When I go to my IP, I get a 500 internal server error. I have tried starting nginx and it looks like it starts fine. I run this: ps awx | grep nginx and I get: 308 ? Ss 0:00 nginx: master process /usr/sbin/nginx 2309 ? S 0:00 nginx: worker process 2311 ? S 0:00 nginx: worker process 2312 ? S 0:00 nginx: worker process 2313 ? S 0:00 nginx: worker process 2850 pts/0 S+ 0:00 grep --color=auto nginx I really am not sure what else to do to get it running. Any help? Neil

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• LDAP + NFS + automount home directories permissions issue

  - by noobishguy

  When an LDAP user logs into the system they have incorrect permissions to their home directory. LDAP and NFS services exist on the same server. The directory shows the correct ownership / permissions: drwx------. 4 ldaptest ldaptest 4096 Jun 9 2014 ldaptest however the UID / GID do not match those on the server client: bash-4.1$ id uid=10001(ldaptest) gid=10001(ldaptest) groups=10001(ldaptest) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 server: [root@ldap1 log]# id ldaptest uid=502(ldaptest) gid=502(ldaptest) groups=502(ldaptest) How do I resolve this?

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• How do I full-screen my CMD?

  - by Codemonkey

  I work a LOT in the windows command line. Unlike other windows, it doesn't maximize - it just goes a big as it can depending on the buffer size. Is there any way I can get the CMD to act like the PuTTY console, flowing with the resize? NOTE: The answer doesn't have to be a tweak to the CMD. If there's a PuTTY-like program out there that will work between me and the command line I'm happy with that - I just want a proper window to work in

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• Virtual PC 2007 Full Screen Resolution

  - by Swami

  I have a laptop (1440 x 900) and an external monitor (1920 x 1200), and I'm running Virtual PC 2007. Initially, my VPC could not switch to fullscreen mode on my external monitor because the max resolution for VPC was only 1600 x 1200. I installed a hotfix (http://support.microsoft.com/kb/958162) and after the hotfix, I was able to view VPC in fullscreen mode on my external monitor, but now I'm unable to view fullscreen on my laptop. It says "please check that the resolution of the guest is not higher than that of the host". I even tried to decrease the resolution of my Virtual PC to less than than of my laptop, but it always resets it back up. So now after the hotfix, I can view fullscreen mode only when my external monitor is plugged in. Any way I can resolve this?

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• Create Report in Microsoft Excel - Permissions Issue in Team Foundation Server 2010

  - by sammarcow

  I am trying to use the feature "Create a Report in Microsoft Excel" for Visual Studio TFS 2010. I am being prompted for a username and password in Excel for any given Team Project when right clicking the item "Active Tasks", selecting "Create a Report in Microsoft Excel," found in the following path within the Team Explorer pane, from Visual Studio 2010: 'Collection Name' | 'Project Name' | Work Items | Iteration 1 | Active Tasks I am a Team Project Administrator and Collection Administrator. I checked The SharePoint site: http :// 'serverName'/Reports/Pages/Folder.aspx and have full sitewide and project permissions on this site. I loaded SQL Server Management Studio on the machine running the instance of TFS (and also the SQL backend for TFS) and ensured that I had roles "serveradmin" and "sysadmin". How do I run this report? Specifically, what permissions are required?

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• krenew command not working : Permission Denied

  - by prathmesh.kallurkar

  I am using a Linux server to perform my simulations. The login and the file-system of the server are protected using kerberos. The file-system is supported using NFS. Since my simulations take a lot of time to run, my ssh sessions used to hang regularly. So, I have started running my simulations in byobu (similar to screen). In order to make sure that my kerberos session remains active, I am using the krenew command. I have entered the following command in my .bash_profile file. (I am sure that it is called for every login) killall -9 krenew 2> /dev/null krenew -b -t -K 10 So everytime I ssh to the server, I kill the existing krenew command. Then, I spawn a new krenew command -b (which runs in background), -t (I forgot why I was using this option !), and -K 10 (It must run after every 10 minutes and refresh the kerberos cache). When I run the simulations, It runs for 14 hours and then suddenly, I am getting error for reading file Permission Denied Is the command that I am running incorrect ??

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• Vista to Vista network visability issue

  - by Sk93

  Hi All, I've got a Vista Business PC and a Vista Business Laptop connected via a virgin media router (Netgear CG2100D) and I cannot get the two machines to see each other correctly over the network. The laptop is connected via wireless, whilst the pc is wired. Both are set to recieve their network settings automatically (DHCP) and both have the windows firewall (the only firewall on either) turned off completely. I can ping each machine fine from one another using the ip addresses, and I can also connect via \. However, connections via \ fail, and I cannot see the machines in the network map. I have tried turning netBIOS to be "always on" on both adapters, but this makes no difference. I've been messing around pretty much for 6 hours now and am getting quite fustrated by this! (my original aim was to get media sharing working, but I've pretty much abandoned that for now). Any ideas?

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• Upgrading PHP, MySQL old-passwords issue

  - by Rushyo

  I've inherited a Windows 2k3 server running an XAMPP-installation from the stone age. I needed to upgrade PHP to facilitate an upgrade to MediaWiki to facilitate a new MediaWiki extension (to facilitate some documentation to facilitate doing my job to facilitate getting paid to facilit... you get the idea). However... installing a new version of PHP resulted in PHP's MySQL libraries refusing to communicate using MySQL's 'old style' 152-bit passwords. Not a problem in theory. The MySQL installation is post-4.1, so it should have the functionality to upgrade the user's passwords from 152-bit to 328-bit (what a weird hashing algorithm...). I ran the following: SET PASSWORD = PASSWORD('foo'); on MySQL but querying: SELECT user, password FROM mysql.user; returned just the same password I started out with - 152-bit. Now... I suspect you're thinking 'AHA! old-passwords is on!'. Unfortunately it's not - I've disabled it in the configuration (explicitly set it to 0), made doubly sure I have an absolute reference to that configuration file and ensured the service isn't using the --old-passwords flag. The service was reset after each and every operation. So I went onto another system and generated the 328-bit hash on there, copying the hash over to the first MySQL instance. Unfortunately, that didn't work either (I did remember to FLUSH PRIVILEGES). The application error is: "'mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool [...snip...] Is there anything else I can try to get PHP to recognise MySQL as not using the 'old insecure authentication'? MySQL seems to be stuck in 'old-passwords' mode and I can't get it out of it.

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• Spam or exchange issue?

  - by John

  I am getting an error message to unknow user on my domain. I would like to know is this just a phishing spam email or it was really send from our domain? I have changed our domain name to OURDOMAIN.COM I have Exchange 2010 installed. Body of the email is Delivery has failed to these recipients or distribution lists: sales The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator. Sent by Microsoft Exchange Server 2007 Diagnostic information for administrators: Generating server: murraygroup.local [email protected] #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ## Original message headers: Received: from ironport.mih.co.uk (10.10.29.9) by mih-exca-01.murraygroup.local (10.10.29.133) with Microsoft SMTP Server id 8.3.106.1; Fri, 29 Jun 2012 12:36:12 +0100 Received: from glamf04.netintelligence.com (HELO mailfilter.iomart.com) ([62.128.193.114]) by ironport.mih.co.uk with SMTP; 29 Jun 2012 12:42:48 +0100 Received: from glamta4.netintelligence.com(localhost.localdomain[127.0.0.1]) by mailfilter.iomart.com ; Fri, 29 Jun 2012 12:37:18 BST Received: from [195.43.137.66] ([195.43.137.66]) by glamta4.netintelligence.com (8.13.1/8.12.8) with ESMTP id q5TBbH4j022142 for <[email protected]>; Fri, 29 Jun 2012 12:37:18 +0100 Date: Fri, 29 Jun 2012 12:37:17 +0100 Message-ID: <20120629145229.4C2A817231D8A7958044@SONW> From: Ines Hampton <[email protected]> To: sales <[email protected]> Reply-To: Marguerite Soto <[email protected]> Subject: User sales MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-Path: [email protected] eporting-MTA: dns;murraygroup.local Received-From-MTA: dns;ironport.mih.co.uk Arrival-Date: Fri, 29 Jun 2012 11:36:12 +0000 Final-Recipient: rfc822;[email protected] Action: failed Status: 5.1.1 Diagnostic-Code: smtp;550 5.1.1 RESOLVER.ADR.RecipNotFound; not found X-Display-Name: sales

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• XCache permission issue

  - by Guilhem Soulas

  I successfully installed XCache on a Linux server where WHM/cPanel is installed too. However when I go to the admin interface it shows me only the cache for the owner of the folder (= a cPanel account). So I copied the admin interface on another cPanel account of the same server and I'm surprised about the memory allocation because it seems to use the memory I set in php.ini for EACH user. So if set the memory size to 64M and I have 10 users, doesn't it mean that XCache can take up to 640M? It's not the behaviour I want because I can't control the memory in that case! I would like to set 64M only for the entire server.

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• System won't boot: Gigabyte HD 7790 1GB OC GPU issue or Corsair VS550 PSU issue?

  - by MGOwen

  Installed a new GPU, and PC won't boot. Turn it on and: No monitor signal at all (tried HDMI and VGA via DVI, on 2 working monitors). CPU and GPU fans DO spin, but No system beeps, no sounds from drives (they might make a small noise in the first 1 second or so, but there's definitely no OS loading or anything like that) If hit "power off" button it turns off immediately (no holding down for 3 seconds like usual) If I put my old HD 5670 GPU back in, everything works fine. But (plot twist!) card is not totally dead. My friend put it in his PC, and it works fine (he even played a game for 15 minutes, no issues). He has a Corsair TX850 850W and a Gigabyte MB. So my main theory is: the GPU isn't getting enough power from the PSU. But is it: Bad PSU? Seems unlikely, since it works fine with the other GPU. Also, the PSU Is brand new and 550W (single 42A/504W 12V rail). Overkill for this GPU. Corsair is a decent brand, but maybe just mine is faulty? Bad GPU? Could it be drawing more power than it should be, somehow, or something? Supposedly HD 7790 needs only 21A/75W on the 12v rail, though this one is factory overclocked a bit... but should that triple the power requirement? Something else? Could there be a motherboard incompatibility somehow? Both MB and GPU are less than a year old and PCI Express 3.0 x16. Things I've tried: Re-seating the video card Testing PC with old GPU (works fine, same PCIe slot). Checked AMD's stated amp/watt requirements of a 7790 and my PSU (see above). My PSU can output twice the amps (single rail) and 5x the Wattage a 7790 needs. Here are the full specs: Gigabyte HD 7790 1GB OC GPU Corsair VS550 550W PSU 4GB RAM AsRock H61M U3S3 motherboard i3-2100 500GB SATA HDD (2007-ish) blu-ray drive (new) PCI 802.11g card Edit: Motherboard BIOS Update seems to have fixed it. (If anyone has same problem and it doesn't work, comment here).

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• Network Printer Issue.

  - by goldenmean

  Hello, I have a Windows-7 Desktop at office. There is a network printer Dell MFP2335dn which is installed on this dekstop. The printer worked fine for me(I could print from my desktop), sometime back but recently i am not been able to print. When i give a print job, it stays in the queue for a long time, nothing gets printed. When i see the status of the printer in "Devices and Printers", it says - Offline. I removed the printer installed on my Desktop, and tried to install the drivers downloaded from Dell website: http://support.euro.dell.com/support/downloads/download.aspx?c=uk&l=en&s=gen&releaseid=R241894&formatcnt=0&libid=0&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=349205 But still the same problem. I don't know what to do more to resolve this. Any pointers about how to resolve this error and get printing done. thanks, -AD.

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• Lighttpd referer issue

  - by Chris

  I have a problem to block files from accessing from different domains as my one. I have added to my lighty config in the "virual host" following: $HTTP["referer"] !~ "^($|http://www\.my-site\.net)" { url.access-deny = ( "" ) } but anyway the site www.example.com can access http://player.my-site.net/player.swf, also it can be accessed directly without a referrer. any idea? //EDIT here is my old apache .htaccess with a rewrite rule thats works perfect, but i dont know how to convert it for lighty: RewriteEngine on RewriteBase / RewriteCond %{HTTP_REFERER} !^http://my-site\.net/ [NC] RewriteCond %{HTTP_REFERER} !^http://www\.my-site\.net/ [NC] RewriteCond %{HTTP_REFERER} !^http://player\.my-site\.net/ [NC] RewriteCond %{HTTP_REFERER} !^http://stream\.my-site\.net/ [NC] RewriteRule .* - [L,R=404]

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• What are some screen accessibility options for folks who like to read BIG text

  - by nthChild

  I have a hard time reading fonts on webpages, programs and email. I have dropped the resolution down to bump up the text and noticed an improvement in reading comprehension. I can alt+scroll wheel in browsers to bump up the text but... I'm looking to see what other options I have out there... If you have any suggestions related to accessibility and displays I'm all ears! OS: Windows 7 Also have a Mac, OSX Mtn Lion

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• AWS RDS Mysql with benstalk Hibernate app: Character encoding issue

  - by TeraTon

  I'm running a webapp from amazon rds with tomcat 7 and spring, which uses hibernate as the persistence layer. The application and utf-8 encoding work properly on localhost, but for some reason when I deploy to amazon, the UTF-8 encoding breaks. I use mysql 5.5.27 on amazon rds and the table that we wish to update has collation set to utf8 - utf8_unicode_ci And in hibernate I have set: < prop key="hibernate.connection.charSet"UTF-8 UTF-8 characters get replaced by ??? and this is of course especially bad for passwords and usernames + email as it basically kills them. Anyone else encountered character encoding breaking when deploying to amazon?

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• Caching issue with Centos forwarding DNS server

  - by Paddington

  I installed a Forwarding DNS server on Centos 5.10 and it is resolving addresses e.g google.com. When I stopped named (service named stop) and tried to dig (dig @localhost A google.com) there was a failure to resolve the address. I checked and see the caching daemon nscd is running. Does this mean the server is not caching at all? How can I get it to cache? named.conf options { // Those options should be used carefully because they disable port // randomization // query-source port 53; // query-source-v6 port 53; // Put files that named is allowed to write in the data/ directory: listen-on port 53 {127.0.0.1; 10.0.0.4;}; directory "/var/named"; // the default dump-file "/var/named/chroot/var/named/data/cache_dump.db"; statistics-file "/var/named/chroot/var/named/data/named_stats.txt"; memstatistics-file "/var/named/chroot/var/named/data/named_mem_stats.txt"; // allow-query {localhost; 192.168.0.0/24; 10.0.0.0/8;}; recursion yes; //allow-query { localhost; 10.0.0.0/8;}; allow-query { localhost; any; }; allow-query-cache { localhost; any; }; forward only; forwarders {8.8.8.8; 8.8.4.4;}; dnssec-enable yes; // dnssec-lookaside auto; /* Path to ISC DLV key */ // bindkeys-file "/etc/named.iscdlv.key"; // managed-keys-directory "/var/named/dynamic"; }; logging { channel default_debug { file "data/named.run"; severity dynamic; }; }; **

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• deploy git project and permission issue

  - by nixer

  I have project hosted with gitolite on my own server, and I would like to deploy the whole project from gitolite bare repository to apache accessible place, by post-receive hook. I have next hook content echo "starting deploy..." WWW_ROOT="/var/www_virt.hosting/domain_name/htdocs/" GIT_WORK_TREE=$WWW_ROOT git checkout -f exec chmod -R 750 $WWW_ROOT exec chown -R www-data:www-data $WWW_ROOT echo "finished" hook can't be finished without any error message. chmod: changing permissions of `/var/www_virt.hosting/domain_name/file_name': Operation not permitted means that git has no enough right to make it. The git source path is /var/lib/gitolite/project.git/, which is owned by gitolite:gitolite And with this permissions redmine (been working under www-data user) can't achieve git repository to fetch all changes The whole project should be placed here: /var/www_virt.hosting/domain_name/htdocs/, which is owned by www-data:www-data. What changes I should do, to work properly post-receive hook in git, and redmine with repository ? what I did, is: # id www-data uid=33(www-data) gid=33(www-data) groups=33(www-data),119(gitolite) # id gitolite uid=110(gitolite) gid=119(gitolite) groups=119(gitolite),33(www-data) does not helped. I want to have no any problem to work apache (to view project), redmine to read source files for project (under git) and git (doing deploy to www-data accessible path) what should I do ?

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• Mod_rewrite issue with godaddy web hosting

  - by MrFoh

  Am trying to use laravel to build a site but my routes all redirect to the homepage. Apache error logs show this AH00124: Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace. And the .htaccess file is this <IfModule mod_rewrite.c> Options -MultiViews Options +FollowSymLinks RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ index.php/$1 [L] </IfModule> The webroot has multiple sub-folders which are document roots for different domains. Am working with one of these sub-folders. What is causing this error and how can it be fixed

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• Shortcut To Full Screen App In Lion

  - by omghai2u

  I postponed getting OSX Lion for as long as I possibly could. Now that I have it, I'm having lots of difficulties getting it to perform how I want. On Snow Leopard my typical setup for working was 4 spaces. I'd keep a Windows VM open on Space #4 full-screened, a Linux open on space #3, and I'd do other stuff on spaces #1 and #2. My keyboard shortcut allowed me to switch between my Windows work (Command + 4) to my Linux work (Command + 3) very quickly, and without the need for my hands to leave the keyboard (or effectively to even quit typing). Productivity was good. I see that on Lion a full-screened VM (and yes, they need to be full screened, Fusion's Unity won't cut it for what I need to do) is its own separate Desktop. I have set up 4 desktops and made my keyboard shortcuts to move between them Command + # just as before. But how do I get my full-screened VM to be one of those already existing desktops? Or, rather, how do I make a short-cut for the full-screened app?

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• Linux iptables / conntrack performance issue

  - by tim

  I have a test-setup in the lab with 4 machines: 2 old P4 machines (t1, t2) 1 Xeon 5420 DP 2.5 GHz 8 GB RAM (t3) Intel e1000 1 Xeon 5420 DP 2.5 GHz 8 GB RAM (t4) Intel e1000 to test linux firewall performance since we got bitten by a number of syn-flood attacks in the last months. All machines run Ubuntu 12.04 64bit. t1, t2, t3 are interconnected through an 1GB/s switch, t4 is connected to t3 via an extra interface. So t3 simulates the firewall, t4 is the target, t1,t2 play the attackers generating a packetstorm thorugh (192.168.4.199 is t4): hping3 -I eth1 --rand-source --syn --flood 192.168.4.199 -p 80 t4 drops all incoming packets to avoid confusion with gateways, performance issues of t4 etc. I watch the packet stats in iptraf. I have configured the firewall (t3) as follows: stock 3.2.0-31-generic #50-Ubuntu SMP kernel rhash_entries=33554432 as kernel parameter sysctl as follows: net.ipv4.ip_forward = 1 net.ipv4.route.gc_elasticity = 2 net.ipv4.route.gc_timeout = 1 net.ipv4.route.gc_interval = 5 net.ipv4.route.gc_min_interval_ms = 500 net.ipv4.route.gc_thresh = 2000000 net.ipv4.route.max_size = 20000000 (I have tweaked a lot to keep t3 running when t1+t2 are sending as many packets as possible). The result of this efforts are somewhat odd: t1+t2 manage to send each about 200k packets/s. t4 in the best case sees aroung 200k in total so half of the packets are lost. t3 is nearly unusable on console though packets are flowing through it (high numbers of soft-irqs) the route cache garbage collector is no way near to being predictable and in the default setting overwhelmed by very few packets/s (<50k packets/s) activating stateful iptables rules makes the packet rate arriving on t4 drop to around 100k packets/s, efectively losing more than 75% of the packets And this - here is my main concern - with two old P4 machines sending as many packets as they can - which means nearly everyone on the net should be capable of this. So here goes my question: Did I overlook some importand point in the config or in my test setup? Are there any alternatives for building firewall system especially on smp systems?

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