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  • Public Facing Recursive DNS Servers - iptables rules

    - by David Schwartz
    We run public-facing recursive DNS servers on Linux machines. We've been used for DNS amplification attacks. Are there any recommended iptables rules that would help mitigate these attacks? The obvious solution is just to limit outbound DNS packets to a certain traffic level. But I was hoping to find something a little bit more clever so that an attack just blocks off traffic to the victim IP address. I've searched for advice and suggestions, but they all seem to be "don't run public-facing recursive name servers". Unfortunately, we are backed into a situation where things that are not easy to change will break if we don't do so, and this is due to decisions made more than a decade ago before these attacks were an issue.

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  • Cannot drop a table in SQL 2005

    - by David George
    I have a SQL Server 2005 SP3 box that one of my developers created a temp table on that we cannot seem to remove because it somehow got brackets in the name of the table? SELECT Name, object_id FROM sys.objects WHERE Name LIKE '%#example%' Results: Name object_id [#example] 123828384 Anyone know how we can get rid of this? Thanks!

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  • How do I deliver mail for wildcard addresses to a particular user/alias/program?

    - by David M
    I need to configure sendmail so that mail delivered for wildcard addresses is accepted for delivery and then delivered to a user, alias, or directly to a script. I can rewrite the envelope/headers any number of ways, but I don't know how to accept the wildcard address when it's provided in RCPT TO: Everything I've tried so far winds up with a 550 user unknown error. So here's a specific example: I want to be able to handle any address that consists of a series of digits followed by a dot followed by a word, then pipe that to a script. If the headers get rewritten, that's OK, but I need the envelope to contain the actual Delivered-To address. Here's the sort of SMTP session I need: 220 blah.foo.com ESMTP server ready; Thu, 22 Apr 2010 20:41:08 -0700 (PDT) HELO blort.foo.com 250 blah.foo.com Hello blort.foo.com [10.1.2.3], pleased to meet you MAIL FROM: <[email protected]> 250 2.1.0 <[email protected]>... Sender ok RCPT TO: <[email protected]> 250 2.1.5 <[email protected]>... Recipient ok I tried some stuff with regex maps, but I never got past 550 user unknown.

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  • DKIM for email through Google Apps domain with external outbound relay

    - by David Gardiner
    I'd like to enable the new Domain Keys DKIM email authentication feature for a domain hosted in Google Apps. Some of my users use an external SMTP gateway (such that when they send email, it doesn't go through smtp.gmail.com). I have an SPF record configured for the domain, and this allows the external SMTP gateways as valid SMTP hosts. (I realise SPF is different to DKIM) Will enabling DKIM adversely affect the external gateway email? eg. Are the externally sent emails at risk of being marked as spam because they would not have the DKIM signature, or will DKIM only positively benefit emails sent through Google's SMTP server?

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  • What is Peformance Monitor telling me when my page faults / second are high?

    - by David Robison
    I have a Windows 7 x64 computer that is having performance issues. After some investigation, I have discovered that the page faults / second on it, as reported by Performance Monitor, are really high. Everything else seems to be normal. Resource Monitor reports no hard faults and lots of available memory. Is this a potential cause for problems, or is it a red herring? If it is something that could be causing problems, what should I do next to figure out what is causing it? Here is a screen shot of the Performance Monitor. Notice that the average page faults / second is 75,887. On another computer that does not have problems, this number is closer to 3,000. Here is a screen shot of the Resource Monitor, sorted by hard faults / second, which is currently 0 for all processes.

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  • keepalived issues on xen domU

    - by David Cournapeau
    Hi, I cannot manage to run keepalived correctly on xen domU. I am following this link for configuration, and it works great on some local VM (running with KVM). If I set up the exact same configuration, but on xen domU, it does not work: both servers do not see each other and decide to be master (10.120.100.99 being the virtual IP) $ sudo ip addr sh eth0 # host1 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:16:3e:78:f5:31 brd ff:ff:ff:ff:ff:ff inet 10.120.100.104/24 brd 10.120.100.255 scope global eth0 inet 10.120.100.99/32 scope global eth0 inet6 fe80::216:3eff:fe78:f531/64 scope link valid_lft forever preferred_lft forever $ sudo ip addr sh eth0 # host2 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 00:16:3e:51:36:20 brd ff:ff:ff:ff:ff:ff inet 10.120.100.105/24 brd 10.120.100.255 scope global eth0 inet 10.120.100.99/32 scope global eth0 inet6 fe80::216:3eff:fe51:3620/64 scope link valid_lft forever preferred_lft forever Is there a way I could debug this - it seems some people are able to use keepalived on xen following some mailing list, but without much info on their config.

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  • Advantages of a 130W vs 90W ac adapter?

    - by David
    I purchased a Lenovo T420S laptop with a 90W/20V AC adapter P/N 42t4426 through my IT department. Subsequently, I ordered a replacement adapter and received a 135W/20V AC adapter P/N 45N0054. The 135W version is about twice as big and heavy as the 90W version. Is there an advantage to the 135W version like faster battery recharging? Are there any negative effects (other than weight), like reduced battery life?

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  • Why Is Volume Shadow Copy Services stopping?

    - by David Mackintosh
    I am running Windows 7 Professional, 64-bit. I am running a backup-over-the-internet software client which depends on the Volume Shadow Copy Services running. Since I installed Service Pack 1 (or rather, didn't object when Windows Update forced Service Pack 1 on me) the backup service is failing to back everything up because VSC isn't running. Most of the time it fails to back up such noise as the Security Essentials database or the Messenger Live contact list -- stuff I really don't care about -- but I don't want to fall into the trap of accepting an Error-state backup as "normal". At the recommendation of the backup software, I have set the VSC service startup mode to be Automatic. When I look in the Event Log, System channel I can see at boot time: The Volume Shadow Copy service entered the running state. ...and then two or three minutes later: The Volume Shadow Copy service entered the stopped state. How do I figure out why VSC is stopping? At the suggestion of the backup vendor, I have already followed the suggestions from http://support.microsoft.com/default.aspx/kb/940184 net stop SENS net stop EventSystem net start EventSystem net start SENS net stop COMSysApp net stop SwPrv net stop VSS cd /d C:\Windows\system32 regsvr32 ole32.dll /s regsvr32 oleaut32.dll /s regsvr32 vss_ps.dll /s vssvc /register /s regsvr32 /i swprv.dll /s regsvr32 /i eventcls.dll /s regsvr32 es.dll /s regsvr32 stdprov.dll /s regsvr32 vssui.dll /s regsvr32 msxml.dll /s regsvr32 msxml3.dll /s regsvr32 msxml4.dll /s net start SwPrv net start VSS net start ProtectedStorage ...and per http://support.microsoft.com/kb/940184 I have deleted the key tree HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\EventSystem\{26c409cc-ae86-11d1-b616-00805fc79216}\Subscriptions I have also run chkdsk /F and chkdsk /R on both permanent hard disks. (I had a similar problem with another computer (same OS, same failure, same start point after SP1 install) but the problem went away when I forced Volume Shadow Copy Services to Automatic startup rather than Manual. I did not have to resort to following the Microsoft KB instructions.)

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  • Sourcing local .bashrc .vimrc without copy to remote machine

    - by David Strejc
    Does anyone have an idea or hack on how to source my local dotfiles (I will probably need more of them so this solution should work with many files) on remote machines without scp them to remote machine? Is something like scp .bashrc to /tmp folder on remote machine and then exporting BASHRC env variable the best solution? I need this because of our company policy and fast cloud servers deployment and redeployment and I don't want to touch .bashrc files on remote machine so my colleges are able to use their default env which doesn't suit me.

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  • Plesk hosting on MediaTemple DV

    - by David
    Hi there, We have a MediaTemple dedicated virtual running Plesk. The problem we're having is that changing the permissions of files on the server to be writable by server owner (apache) is conflicting with the ability to upload and overwrite files via the FTP user. Here's an example, I upload a file from user "serverftp" and they own the new file in the httpdocs folder. I then change the permission of an image upload folder to the apache user to that I can upload images via a PHP script. Uploading or changing that folder with the serverftp user is then locked out. Speaking to tech support didn't get very far because there are some strange group permissions going on and it would involve me adding every single domain FTP user to the pcantl group or something similar. I'm wondering how I can easily change things so that I don't have this problem anymore.

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  • Which databases support parallel processing across multiple servers?

    - by David
    I need a database engine that can utilize multiple servers for processing a single SQL query in parallel. So far I know that this is possible with the some engines, though none of them are feasible for me either because of pricing or missing features. The engines currently known to me are: MS SQL (enterprise) DB2 (enterprise) Oracle (enterprise) GridSQL Greenplum Which other engines have this feature? Do you have any experience with using this feature? Edit: I have now proposed a method for creating one myself. Any input is welcome. Edit: I have found another one: Informix Extended Parallel Server

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  • Difference and correct usage for /tmp and /var/tmp

    - by David
    I haven't put much thought into this until now, but it seems odd that there is a /var/tmp and /tmp directories for most of the linux distro's I routinely use ( Ubuntu, Centos, Redhat ). Is there any semantic difference between the two, like when whoever designed the first file system layout, he or she thought "Not all tmp file's are created equal!" The only difference I've found for centos, is that /tmp routinely scrubs out files older then 240 hours while /var/tmp holds onto stale files for 720 hours.

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  • How to get Windows Server 2008 VM to use multiple cores

    - by David Fraser
    I have a Windows Server 2008 machine running in VirtualBox. On initial installation, only one processor was made available, but now I want to run it as a multiprocessor machine. I have made all four cores available in the VirtualBox settings (as well as enabling VT-x/AMD-V and Nested Paging), but Task Manager still only shows one CPU. However, the four CPU cores are visible in Device Manager under Processors. In the event log on startup, I can see the following relevant events: EventLog.6009 Microsoft (R) Windows (R) 6.00.6002 Service Pack 2 Multiprocessor Free Kernel-Processor-Power.4 Processor 0 exposes the following: 1 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) How can I make this system actually boot up as a multiprocessor machine?

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  • Domain Squatter Blacklist

    - by David Chang
    Is there a list of common ip addresses used by domain squatters (the ip addresses of the sites they resolve the domains to)? I have a list of domains and I need to remove most squatted/parked domains from the list, I can do that in a perl script (that currently removes dead domains) but I need the IP addresses the squatted domains resolve to so I can remove them as well. I know there are spam/phishing/malware blacklists available, does anyone know of a squatter blacklist? I can't find one using Google. EDIT: I am trying to remove dead domains from a list, I can already remove domains that don't resolve but I need to remove squatted domains as well so I need a list of ip addresses squatted domains resolve to so I can remove them.

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  • Windows service running under network credentials doesn't autostart

    - by David Alpert
    I have a Subversion Server running as a resident service on a Windows XP Pro machine. That service needs to access a secure network fileshare, so I used the Services-Properties-Log On tab to tell the service to run as a user who has access to the target fileshare. That works out fine until the machine restarts, when the service fails to autostart. I am able to start it manually by logging in, going back to that Services-Properties-Log On tab and reconfiming the explicit credentials. Do I have to manually start this service under alternate credentials every time the machine reboots? Is there something else I can do to make sure that my Subversion server service autostarts with proper access to authenticate against this network share?

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  • Mount CIFS Credentials File has Special Character

    - by David George
    I'm having trouble mounting a share on my XenServer (5.6 FP1). From the command line I try: mount.cifs //server/share /mnt/share -o credentials=credfile The contents of credfile is: username=Administrator password=What@zR\!p3s When I run the above mount command I get "Access Denied". However if I run the following command it works: mount.cifs //server/share /mnt/share -o username=Administrator,password=What@zR\!p3s Please note the "\" is to escape the bang and I've tried this with and without it in the credentials file. Any suggestions?

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  • How do I get Windows 7 wallpaper to display the company logo properly?

    - by David Silva Smith
    Windows 7 is not displaying our company background properly. Curves show pixelation and straight lines are jagged. I'm working with a scalable vector graphics (SVG) image that I've exported to the same resolution (pixel dimensions, to be technical) as the desktop, which is 1440x900. I have tried exporting the image as a .png, .jpg, and .bmp. All of these look correct in an image viewing program, such as Windows Photo Viewer and Paint, but when I set the Windows background to these images, curves show pixelation and straight lines are jagged. Reading online, it seems that behind the scenes, Windows is converting the image to a .jpg with low quality compression, which is causing the issue. I've tried setting the image as a background through Internet Explorer, saving it as a .jpg, and putting the file in the Windows photo directory as suggested in some online forums, but none of those solutions have fixed my issue.

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  • PSKill does not run from VbScript

    - by David
    We have a site on our local IIS6 Windows 2003 server that occasionally locks up, and we would like a VbScript to kill the process. It is located in the system32 folder. I'm running these tests on the local machine. For simplicity, my VbScript file simply has lines such as these: WScript.Echo "PSKill.exe " & W3WP.ProcessId WshShell.Run "PSKill.exe " & W3WP.ProcessId WScript.Echo "Killed Process" Obtained earlier in the script, W3WP.ProcessId contains the correct process ID. The script outputs to the screen: PSKill.exe 6884 But the line that is supposed to execute the command does nothing. If I type the command in, it works fine. Why does PsKill work fine when I type it, but not from VbScript?

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  • Configuring my Linux firewall for Tomcat

    - by David Pinn
    I'm following some instructions for Installing Tomcat. They require me to add the following line to my iptables file: -A RH-Lokkit-0-50-INPUT -p tcp -m tcp --dport 8080 --syn -j ACCEPT Having carefully read the man page for iptables, I have learned what the parameters do, except for the first one. What does -A RH-Lokkit-0-50-INPUT do, and can you confirm that it is sensible in this case?

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  • Is the APC BR700G UPS (or similar) compatible with Active PFC power supplies?

    - by David Zaslavsky
    I'm looking at getting a UPS for my home computer. So far the APC BR700G looks very promising, except for one thing: one of the reviews on Newegg says that this UPS does not work with a power supply with Active PFC. Pros: Unit looks great, built well, very heavy, was excited to use it. Cons: Didn't research enough - many newer power supplies like my corsair 750w (and yes dells and other mainstreamers sell them too) that I bought last year have a feature called active pfc (power factor corrected). The signal for this backup battery doesn't fully support that feature and can cause issues. You can find an article on APCs site if you search their user forums for PFC. And the power supply in my computer is, in fact, an Active PFC PSU. I've already found one answer on this site claiming that it's not an issue, that "most quality supplies these days have PFC and work just fine with a UPS." That disagrees with the review on Newegg. Can someone explain this discrepancy? Also, what is it exactly about a UPS that makes it incompatible with an Active PFC PSU? (if anything) Is there some way to tell based on the technical specifications, or do I just have to hunt for reviews online to avoid wasting my money? While any input would be appreciated, I would prefer to get an answer from someone with actual experience with similar UPS's and Active PFC power supplies, who can tell me whether it works or not.

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  • Redmine VirtualHost config not working with Document Root

    - by David Kaczynski
    I am trying to have requests for https://redmine.example.com access my redmine instance, but I am just getting an "Index of /" page with the contents of /var/www/redmine (which is a symbolic link to /usr/share/redmine/public). My VirtualHost config: <VirtualHost *:443> ServerName redmine.example.com DocumentRoot /var/www/redmine SSLEngine on SSLCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key BrowserMatch "MSIE [2-6]" \ nokeepalive ssl-unclean-shutdown \ downgrade-1.0 force-response-1.0 BrowserMatch "MSIE [17-9]" ssl-unclean-shutdown </VirtualHost> My /etc/apache2/sites-enables/redmine: RailsBaseURI /redmine How do I get the requests for https://redmine.example.com to correctly launch my redmine instance?

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