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  • Remote management interface for managing ip6tables (or an alternative firewall)

    - by Matthew Iselin
    I'm working with IPv6 and have run into an issue configuring ip6tables on our main router in order to control what can come into the network. A default DROP rule in the FORWARD section has worked well (obviously leaving ESTABLISHED,RELATED as ACCEPT) to keep internal clients' open ports from being accessed. However, running an ip6tables command for every little change is unwieldy. Whilst we are able to continue creating rules manually, I'm wondering if there's some sort of management interface we could use to create the rules quickly and easily. We're looking to be able to save time working on our firewall as well as providing a simple method for modifying rules for those who will eventually replace us. I know webmin (heavily locked down on our network, naturally) has support for modifying iptables rules, but seemingly no support for ip6tables. Something similar would be fantastic. Alternatively, suggestions for a firewall solution apart from iptables/ip6tables which can be managed remotely wouldn't be out of order. A web interface for management is certainly preferable, even if it is just a wrapper with shiny buttons over the raw config files.

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  • Ubuntu Server attack? how to solve?

    - by saky
    Hello, Something (Someone) is sending out UDP packets sent from our whole ip range. This seems to be multicast DNS. Our server host provided this (Our IP Address is masked with XX): Jun 3 11:02:13 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 Jun 3 11:02:23 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 Jun 3 11:02:32 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 Jun 3 11:02:35 webserver kernel: Firewall: *UDP_IN Blocked* IN=eth0 OUT= MAC=01:00:5e:00:00:fb:00:30:48:94:46:c4:08:00 SRC=193.23X.21X.XX DST=224.0.0.251 LEN=73 TOS=0x00 PREC=0x00 TTL=255 ID=0 DF PROTO=UDP SPT=5353 DPT=5353 LEN=53 I checked my /var/log/auth.log file and found out that someone from China (Using ip-locator) was trying to get in to the server using ssh. ... Jun 3 11:32:00 server2 sshd[28511]: Failed password for root from 202.100.108.25 port 39047 ssh2 Jun 3 11:32:08 server2 sshd[28514]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.100.108.25 user=root Jun 3 11:32:09 server2 sshd[28514]: Failed password for root from 202.100.108.25 port 39756 ssh2 Jun 3 11:32:16 server2 sshd[28516]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=202.100.108.25 user=root ... I have blocked that IP address using this command: sudo iptables -A INPUT -s 202.100.108.25 -j DROP However, I have no clue about the UDP multicasting, what is doing this? who is doing it? and how I can stop it? Anyone know?

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  • Adding a GET parameter to URL causes 404 error

    - by Adrian Grigore
    I'm trying to install the syntaxhighlightter evolved plugin to my wordpress blog. I've uploaded and activated the plugin, but it did not work. I've looked into the page source code and found out that the plugin style is loaded from the following URL: http://devermind.com/wp-content/plugins/syntaxhighlighter/syntaxhighlighter/styles/shCore.css?ver=2.0.320 This causes a 404 error (page not found). The strange thing though is that when I remove the GET parameters, the CSS loads ok: http://devermind.com/wp-content/plugins/syntaxhighlighter/syntaxhighlighter/styles/shCore.css What could be causing this problem and how can I fix this? Unfortunately I don't know how to make wordpress drop the GET parameters when loading the stylesheet. EDIT: As I just found out, this happens only in Firefox (3.0.11). IE loads both URLs above just fine. Not that this would be of any help though, so any suggestions would be appreciated. SECOND EDIT: I tried this on my laptop and it works fine with Firefox 3.08. So this really seems to be a browser problem after all.

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  • Experiences in Upgrading from Exchange 2003 to Exchange 2010

    - by gWaldo
    I'm currently running Exchange 2003 SP2 Cluster on a Server 2003 AD Forest (in native 2003 mode), and we beginning to plan the upgrade to Server 2008 AD and Exchange 2010. We have two main sites, one middle-sized office, and a couple of smaller sites which have DCs (which may be RODCs after the upgrade). Currently all of our Exchange cluster is in my main site, but we are considering using the new datastore paradigm for load-balance/failover at the other large site, but this is not set in stone. Right now we are in the information-gathering and planning phases. I am looking for input of any gotchas experienced while performing either upgrade, but especially the Exchange upgrade. Gotchas? What surprised you? What wasn't documented? What said one thing but was misleading? (Confusing either in content or severity.) What is great or horrible about the new system? What worked well? What worked poorly? If you were to do it over again...? (I know that this isn't so much a question that can be definitively answered, but I'm happy to reward insight and useful resources (not the Microsoft documentation, but Blogposts are welcome) with upvotes.) UPDATE A couple items of note: -We are not currently using OWA (currently only the admins), but it may become more of a consideration with iOS devices. -We do have a small number of Blackberries in the environment (< 10%). -In addition to the standard Exchange connectors, we have a third-party connector for Captaris RightFax integration.

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  • .ashx cannot find type error on IIS7 , no problems on webdev server

    - by Aivan Monceller
    I am trying to make AspNetComet.zip work on IIS7 (a simple comet chat implementation) Here is a portion of my web.config. <system.web> <httpHandlers> <add verb="POST" path="DefaultChannel.ashx" type="Server.Channels.DefaultChannelHandler, Server"/> </httpHandlers> </system.web> <system.webServer> <handlers> <add name="DefaultChannelHandler" verb="POST" path="DefaultChannel.ashx" type="Server.Channels.DefaultChannelHandler, Server"/> </handlers> </system.webServer> When I publish the website on my localhost IIS7 I receive an error: POST http://localhost/DefaultChannel.ashx 500 Internal Server Error Could not load type 'Server.Channels.DefaultChannelHandler The target framework of this project is .Net 2.0 I tried the Classic and Integrated Mode application pool for .Net 2.0 with no luck. I also tried converting the project to 4.0 and tried the Classic and Integrated Mode application pool for .Net 4.0 with no luck. I also tried adding the managed handler through IIS Manager's Handler Mappings. If you have time please download the source (184kb) to reproduce the problem on your own machine. The zip contains a VS2010 solution (.Net 2.0). You could also try to convert this to .Net 4.0 I am using Windows 7 anyway if that matters. If you need more details, please drop your comments below. This is working fine by the way on my webdev server.

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  • How can I change the default location/action of 'Open Outlook Data File' in Outlook 2010?

    - by Chadddada
    I have recently deployed a Remote Desktop Host server that functions as a remote Microsoft Office 2010 work space for users. In part of the locking down of this server I have installed all programs on the D: drive and, through the use of Group Policy, hidden all the drives on the server from standard users. In addition to hiding these drives I am not allowing users to save anything locally (on the server) or open Libraries. However one of the functions of the server is to provide the Outlook client. Often users will have the .PST file stored on a network location and want to open this in Outlook. Can I change the default action or location that File Open Open Outlook Data File looks or tries to pull the file from? The default location seems to be under Users / Libraries. When click 'Open' you get a warning: This operation has been cancelled due to restrictions in effect on this computer. Clicking OK drops the user into a small menu that shows attached network drives under Computer. Can I instead have the 'Open' click drop the users in a defined network drive or just open computer and allow them to select a share? I don't want them to see the error message. A solution that looks to have been used for Office 2000/03 is: Key: HKEY_CURRENT_USER\Software\Microsoft\Office\<version>\Outlook Value name: ForceOSTPath Value type: REG_EXPAND_SZ Value: path to your storage folder I am not sure if there is a better way to do this now OR if this even works with Office 2010.

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  • OpenVPN IPV6 Tunnel Radvd

    - by Arenstar
    Hello.. I have an interesting question regarding ipv6 + openvpn.. My Version is OpenVPN 2.1.1 i have been given a native /64 ipv6 network ( for this example 2001:acb:132:acb::/64 ) The plan was/is, route this block through openvpn and into an office ( for testing purposes ) Soo to explain.. I have a Centos Box as the first linux "router" in a datacenter & a Ubuntu box as the second linux "router" in the office I have created a simple point-to-point tunnel using tun ( based off ipv4 address to start the tunnel ) I have assigned to Centos /sbin/ip addr add fed1::1/128 dev eth0 /sbin/ip addr add fed2::2/128 dev tun0 /sbin/ip route add 2001:acb:132:acb::/64 dev tun0 ## ipv6 Block down the tunnel /sbin/ip route add ::/0 dev eth0 ## Default out to Gateway I have assigned to Ubuntu /sbin/ip addr add fed1::3/128 dev tun0 /sbin/ip addr add fed1::4/128 dev eth0 /sbin/ip route add 2001:acb:132:acb::/64 dev eth0 ## ipv6 Block down to eth0 /sbin/ip route add ::/0 dev tun0 ## Default up the tunnel I have also included on both servers.. sysctl -w net.inet6.ip6.forwarding=1 Looks Good... right??? Wrong.. :( I am not able to ping fed1::1 from fed1::4 (Ubuntu) (can ping :4,:3,:2) However, i can ping fed1::1 fed1::2 from :3 ?????? ( very strange ) I am able to access the internet from any ipv6 interface on the Centos Box but clearly not from the Ubuntu box.. Further, i will eventually run radvd on the Ubuntu box eth0, and autoconf the network with ipv6 address's Anyone with some advice / tips to help me out.. ??? Cheers

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  • Setup: Eclipse in Ubuntu with Apache2 and Subversion

    - by Ricalsin
    Trying to setup Eclispe. I am running ubuntu 10.10 (Maverick). Apache2.2.16 Subversion 1.6.12 The Eclipse help/about/installed software says: Eclipse Platform 3.5.2 Subclipse 1.0.0 Version Control with Subversion 1.1.1 The Subclips wiki I followed is here I have installed the libsvn-java app as discussed. I added the line "-Djava.library.path=/usr/lib/jni" to the eclipse.ini file I checked the Eclipse help/about/confirguration settings and both of these lines are listed: eclipse.vmargs=-Djava.library.path=/usr/lib/jni java.library.path=/usr/lib/jni I checked that those files are in those directories. Still, when I check the preferencesteamsvn an error dialog shows: Failed to load JavaHL Library. These are the errors that were encountered: no libsvnjavahl.1 in java.library.path Incompatible JavaHL library loaded 1.3.x or later required I followed the "Testing JavaHL libraries" troubleshooting section at the bottom of the wiki: I downloaded the tarbal and ran it in a folder on my desktop with no problems. Then, I followed the instructions and placed that file INSIDE the path (usr/lib/jni/testJavaHL) and ran it from there. There are 50 tests performed and each one of them came back with this same error (posting only one for brevity): 50) testCommitRevprops(org.tigris.subversion.javahl.BasicTests)java.io.FileNotFoundException: /usr/lib/jni/testJavaHL/local_tmp/greek_files/iota (No such file or directory) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.<init>(FileOutputStream.java:209) at java.io.FileOutputStream.<init>(FileOutputStream.java:160) at org.tigris.subversion.javahl.WC.materialize(WC.java:70) at org.tigris.subversion.javahl.SVNTests.buildGreekFiles(SVNTests.java:303) at org.tigris.subversion.javahl.SVNTests.setUp(SVNTests.java:222) at org.tigris.subversion.javahl.RunTests.main(RunTests.java:111) FAILURES!!! Tests run: 50, Failures: 0, Errors: 50 Any ideas as to how/why the "local_tmp/greek_files/iota" is appended to the directory? I assume that's my problem.. I'm also having a problem with newrepository location = ...as the directory location of my svn repository is one level above the home directory - which is prepended to whatever I place in the dialog box - resulting in this error: svn: '/home/ricalsin/file:/home/svn' does not exist Thank you for any help.

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  • Can MS Services for Unix be deployed and accessed from a shared drive?

    - by Ian C.
    I'm interested in experimenting with replacing our dependency on MKS with MS' Sevices for Unix toolset. I was wondering if anyone has any experience with deploying SFU on a shared drive? We like to, wherever possible, host our dev tools on one central NAS and call to the NAS to access the tools instead of rolling stuff out to each and every desktop. I'm not interested in the NFS support or ActiveState Perl. Really, none of the daemon technology is required here. I'm looking for replacements for the coreutils/binutils stuff you find in Linux (and MKS on Windows): sed, awk, csh, bash, grep, ls, find -- the meat-and-potates command line apps that our build and test scripts are built around. If I limit the install to just the Interix GNU Components (and maybe the Remote Connectivity components) will is run nicely from a shared location? To head off some questions: Yes, I've looked at Cygwin. Unfortunately it's performance in our build and test environment is poor. It runs considerably slower than MKS and it's not a direct drop-in replacement for MKS (thanks to its internal pathing and limitations with commands like 'ps'), so it's a tougher sell. Yes, I'm looking at the MinGW offering in parallel to this.

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  • Server 2012, Jumbo Frames - should I expect problems?

    - by TomTom
    Ok, this sound might stupid - but is there any negative on just enabling jumbo frames in practice? From what I understand: Any switch or ethernet adapter that sees a jumbo frame it can not handle will just drop it. TCP is not a problem as max frame size is negotiated in the setinuo phase. UCP is a theoretical problem as a server may just send a LARGE UDP packet that gets dropped on the way. Practically though, as UDP is packet based, I do not really think any software WOULD send a UDP packet larger than 1500 bytes net without app level configuration changes - at least this is how I do my programming, as it is quite hard to get a decent MTU size for that without testing yourself, so you fall back in programming to max 1500 packets. The network in question is a standard small business network - we upgraded now from a non managed 24 port switch to a 52 port switch with 4 10g ports (netgear - quite cheap) and will mov a file server to 10g for also ISCSI serving. All my equipment on the Ethernet level can handle minimum 9000 bytes and due to local firewalls I really want to get packets larger (less firewall processing), but the network is also NAT'ed to the internet. On top, different machines move around (download) large files (multi gigabyte area) quite often for processing. The question is - can I expect problems when I just enable jumbo frames? Again, this is not totally ignorance - I just don't see programs sending more than 1500 byte UDP packets (if that is a practical problem please tell me) and for TCP the MTU is negotiated anyway. if there is a problem I can move to a dedicated VLAN, but this has it's own shares of problems as basically most workstations must then be on both VLAN's.

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  • KVM and JBoss Java Application Server

    - by Jason
    We have a large Xen deployment running on both RHEL and CentOS and have recently started looking at KVM since this is where it looks like the future of VM's are on Linux. We can load the server and get everything running without an issue. However when we load up a new one with JBoss (4.2 Community edition, Sun JDK 6) and load a large EAR the server goes a little crazy. The %sy will jump to 80-99% and just hang for large periods of time we see a similar jump in %us on the host machine. We though at first this might be I/O as it seems to happen at start of JBoss but then would "cool down" after everything got loaded. We did some tests by extracting some large tar.gz files and using jar -xvf on the ear but could not re-create. Then we starting thinking this might be some type of memory access issues. We loaded a c-program that would generate a lot of memory activity and sure enough we saw the spikes again. Not as high mind you but we did see it jump. We then wrote a small java program to do the same thing and sure enough we saw it jump again. Any thoughts on what might be causing this? Is this just the way KVM works? As a side note we do NOT see this behavior on any other setup. Xen, VMWare and/or native iron. The system does seem a bit slower than our Xen / VMware ones.

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  • How do I convert a video to GIF using ffmpeg, with reasonable quality?

    - by Kamil Hismatullin
    I'm converting .flv movie to .gif file with ffmpeg. ffmpeg -i input.flv -ss 00:00:00.000 -pix_fmt rgb24 -r 10 -s 320x240 -t 00:00:10.000 output.gif It works great, but output gif file has a very law quality. Any ideas how can I improve quality of converted gif? Output of command: $ ffmpeg -i input.flv -ss 00:00:00.000 -pix_fmt rgb24 -r 10 -s 320x240 -t 00:00:10.000 output.gif ffmpeg version 0.8.5-6:0.8.5-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers built on Jan 24 2013 14:52:53 with gcc 4.7.2 *** THIS PROGRAM IS DEPRECATED *** This program is only provided for compatibility and will be removed in a future release. Please use avconv instead. Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input.flv': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: isommp42 creation_time : 2013-02-14 04:00:07 Duration: 00:00:18.85, start: 0.000000, bitrate: 3098 kb/s Stream #0.0(und): Video: h264 (High), yuv420p, 1280x720, 2905 kb/s, 25 fps, 25 tbr, 50 tbn, 50 tbc Metadata: creation_time : 1970-01-01 00:00:00 Stream #0.1(und): Audio: aac, 44100 Hz, stereo, s16, 192 kb/s Metadata: creation_time : 2013-02-14 04:00:07 [buffer @ 0x92a8ea0] w:1280 h:720 pixfmt:yuv420p [scale @ 0x9215100] w:1280 h:720 fmt:yuv420p -> w:320 h:240 fmt:rgb24 flags:0x4 Output #0, gif, to 'output.gif': Metadata: major_brand : mp42 minor_version : 0 compatible_brands: isommp42 creation_time : 2013-02-14 04:00:07 encoder : Lavf53.21.1 Stream #0.0(und): Video: rawvideo, rgb24, 320x240, q=2-31, 200 kb/s, 90k tbn, 10 tbc Metadata: creation_time : 1970-01-01 00:00:00 Stream mapping: Stream #0.0 -> #0.0 Press ctrl-c to stop encoding frame= 101 fps= 32 q=0.0 Lsize= 8686kB time=10.10 bitrate=7045.0kbits/s dup=0 drop=149 video:22725kB audio:0kB global headers:0kB muxing overhead -61.778676% Thanks.

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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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  • How can I get VirtualBox to run at 1366x768?

    - by Joe White
    I'm trying to run Windows 8 in VirtualBox. My laptop's display is exactly 1366x768. Windows 8 disables some of its features if the resolution is less than 1366x768, so I need to run the guest OS fullscreen. The problem is, VirtualBox refuses to run the guest at 1366x768. When VirtualBox is "fullscreen", the guest is only 1360x768 -- six pixels too narrow. So there's a three-pixel black bar at the left and right sides of the display. This user had the same problem, but the accepted answer is "install the Guest Additions", which I've already done; that got me to 1360, but not to 1366. According to the VirtualBox ticket tracker, there used to be a bug where the guest's screen width would be rounded down to the nearest multiple of 8, but they claim to have fixed the bug in version 3.2.12. I'm using version 4.1.18 and seeing the same problem they claim to have fixed, so either they broke it again, they were wrong about ever having fixed it, or my problem is something else entirely. This answer suggested giving the VM 128MB of video memory, and claimed no problems getting 1366x768 afterward. When I created the VM, its display memory was already defaulted to 128 MB. I tried increasing it to 256MB, but with no effect: the guest is still six pixels too narrow. My host OS is Windows 7 64-bit, and I'm running VirtualBox 4.1.18. How can I get VirtualBox to run my guest OS fullscreen at my display's native resolution of 1366x768?

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  • Cannot properly read files on the local server

    - by Andrew Bestic
    I'm running a RedHat 6.2 Amazon EC2 instance using stock Apache and IUS PHP53u+MySQL (+mbstring, +mysqli, +mcrypt), and phpMyAdmin from git. All configuration is near-vanilla, assuming the described installation procedure. I've been trying to import SQL files into the database using phpMyAdmin to read them from a directory on my server. phpMyAdmin lists the files fine in the drop down, but returns a "File could not be read" error when actually trying to import. Furthermore, when trying to execute file_get_contents(); on the file, it also returns a "failed to open stream: Permission denied" error. In fact, when my brother was attempting to import the SQL files using MySQL "SOURCE" as an authenticated MySQL user with ALL PRIVILEGES, he was getting an error reading the file. It seems that we are unable to read/import these files with ANY method other than root under SSH (although I can't say I've tried every possible method). I have never had this issue under regular CentOS (5, 6, 6.2) installations with the same LAMP stack configuration. Some things I've tried after searching Google and StackExchange: CHMOD 0777 both directory and files, CHOWN root, apache (only two users I can think of that PHP would use), Importing SQL files with total size under both upload_max_filesize and post_max_size, PHP open_basedir commented out, or = "/var/www" (my sites are using Apache VirtualHosts within that directory, and all the SQL files are deep within that directory), PHP safe mode is OFF (it was never ON) At the moment I have solved this issue with the smaller files by using the FILE UPLOAD method directly to phpMyAdmin, but this will not be suitable for uploading my 200+ MiB SQL files as I don't have a stable Internet connection. Any light you could shed on this situation would be greatly appreciated. I'm fair with Linux, and for the things that do stump me, Google usually has an answer. Not this time, though!

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  • How do I secure Sql Server 2008 R2

    - by Mark Tait
    I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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  • My client's solution of a Windows SBS 2011 VM on an Ubuntu host and VirtualBox is pinning the host CPU

    - by Scott Stamp
    Here's my situation, I've got a client hosting two servers (one VM), with the host providing VMware Zimbra, the other Windows Small Business Server 2011. Unfortunately, the person before me had configured this setup as follows. Host: Ubuntu Desktop Edition 10.04 (I know, again, not my choice) running VMware Zimbra 8GB of RAM On-board RAID1 of two 320GB Seagate Barracuda drives for the OS Software RAID5 of four 500GB WD Caviar Black drives on MDADM for bulk storage (sorry, I don't know the model #) A relatively competent quad-core Intel Core i7 CPU from the Nehalem architecture (not suspicious of this as the bottleneck) Guest: Windows Small Business Server 2011 4GB of RAM Host-equivalent CPU allocation VDI file for OS hosted on the on-board RAID, VDI file for storage hosted on the on-board RAID For some reason when running, the VM locks up when sitting nearly idle, and the VirtualBox process reports values of 240%+ in top (how is that even possible?!). Anyone have any ideas or suggestions? I'm totally stumped on this one. Happy to provide whatever logs you'd like to take a look at. Ideally I'd drop VirtualBox and provision this with VMware Workstation, but the client has objected to the (very nominal) costs involved. If hardware needs to be purchased to help, it will be, but we're considering upgrades a last-resort at this time. Thanks in advance! *fingers crossed*

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  • Arch Linux drops me on my school network

    - by Kravlin
    I'm running a Lenovo X61 which i carry around my college for getting on the internet at various points in the day. The network has always been finicky but recently it's gotten worse. I'll connect using iwconfig, get an ip from dhcpcd and log in using vpnc to their system. Sometimes I'll stay connected for hours but most of the time within 30 seconds my network traffic will drop to zero and i'll be unable to do anything. My computer still belives it's connected, however to try again i need to put my wireless interface down, put it back up and try again. It's gotten so bad that i've got a window on my computer pinging yahoo or google constantly in order to know if i'm still able to get online. I know other people who have used Arch Linux that don't have the same problems as well as people who use Ubuntu who haven't had any problems either. It seems like my computer is a special case. Does anyone have any suggestions on how to fix it? dmesg doesn't show anything out of the ordinary going on and i don't know where else to look for errors or other things to try. Edit: this doesn't happen on my home network. It's a problem that only happens at school.

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  • IPtables - Accept Arbitrary Packets

    - by Asad Moeen
    I've achieved a lot on blocking attacks on GameServers but I'm stuck on something. I've blocked major requests of game-server which it aceepts in the form "\xff\xff\xff\xff" which can be followed by the actual queries like get status or get info to make something like "\xff\xff\xff\xff getstatus " but I see other queries if sent to the game-server will cause it to reply with a "disconnect" packet with the same rate as input so if the input rate is high then the high output of "disconnect" might give lag to the server. Hence I want to block all queries except the ones actual clients use which I suppose are in the form "\xff\xff\xff\xff" or .... so, I tried using this rule : -A INPUT -p udp -m udp -m u32 ! --u32 0x1c=0xffffffff -j ACCEPT -A INPUT -p udp -m udp -m recent --set --name Total --rsource -A INPUT -p udp -m udp -m recent --update --seconds 1 --hitcount 20 --name Total --rsource -j DROP Now where the rule does accept the clients but it only blocks requests in the form "\xff\xff\xff\xff getstatus " ( by which GameServer replies with status ) and not just "getstatus " ( by which GameServer replies with disconnect packet ). So I suppose the accept rule is accepting the simple "string" as well. I actually want it to also block the non-(\xff) queries. So how do I modify the rule?

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  • Any non-custom way to manage iptables with fail2ban and libvirt+kvm?

    - by Peter Hansen
    I have an Ubuntu 9.04 server running libvirt/kvm and fail2ban (for SSH attacks). Both libvirt and fail2ban integrate with iptables in different ways. Libvirt uses (I think) some XML config and during startup (?) configures forwarding to the VM subnet. Fail2ban installs a custom chain (probably at init) and periodically modifies it to ban/unban probable attackers. I also need to install my own rules to forward various ports to servers running in VMs and on other machines, and set up rudimentary security (e.g. drop all INPUT traffic except the few ports I want open), and of course I'd like the ability to add/remove rules safely without restarting. It seems to me iptables is a powerful tool that's sorely lacking some sort of standardized way of juggling all this stuff. Every project, and every sysadmin, seems to do it differently! (And I think there's lots of "cargo cult" admin going on here, with people cloning crude approaches like "use iptables-save like so".) Short of figuring out the gory details of exactly how both of these (and potentially other) tools manipulate the netfilter tables, and developing my own scripts or just manually executing iptables commands, is there any way to safely work with iptables while not breaking the functionality of these other tools? Any nascent standards or projects defined to bring sanity to this area? Even a helpful web page I missed that might cover at least these two packages together?

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  • How do I stop panning on a monitor that supports a specific resolution?

    - by IronicMuffin
    Hi all, I've been battling this for a few days now. Any and all help is appreciated. I have a planar monitor with a native res of 1280x1024. At one point, I had used PowerStrip to override "something" and set the res to 1600x1200, and it worked great. I then installed new intel graphics drivers for my 86895g (or w/e model) video card, which screwed up whatever settings I had. If I set it to 1600x1200 this time, it would set the res correctly, but give me a 1280x1024 viewport and the screen would pan when the mouse got to the edges of the screen. Absolutely not useful. Ok, so I was limited to 1280x1024 now. W/e. Now...enter new video card with two video ports. I have two monitors now and the latest nVidia drivers. I decide to try to get dual 1600x1200 going...ended up screwing the original monitor up so much now that it's at 1280x1024, with a 1024x768 viewport and panning! Absolutely not usable now. So what I need, and I can't seem to find on any forums, is help doing one or more of the following: Clearing out all monitor/edid info out of the windows registry without corrupting the registry. Actually correctly override the EDID values and get my sweet res back. Some other way of getting back to at least dual 1280x1024 with NO panning. Note: My device manager shows 4 monitors for some reason. My registry shows entries for all sorts of monitors that have been hooked up to the machine over the years. It's making it difficult to debug. Experience with PowerStrip would be helpful. I've been mucking with Phoenix EDID designer and MonInfo as well, but I'm stumbling around in the dark with these. Windows XP SP2 nVidia GeForce 6200 nVidia drivers: v258.96 Monitor: Planar PL 1910M Thanks!

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  • Can enabling a RAID controller's writeback cache harm overall performance?

    - by Nathan O'Sullivan
    I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed drop to ~5mb/sec while the write speed stays at more or less the same 400mb/sec. The output of iostat -x as you would expect, shows that very few read transactions are being executed while the disk is bombarded with writes. If i turn the controller's writeback cache off, I dont see a 50:50 split but I do see a marked improvement, somewhere around 100mb/s reads and 300mb/s writes. I've also found if I lower the nr_requests setting on the drive's queue (somewhere around 8 seems optimal) I can end up with 150mb/sec reads and 150mb/sec writes; ie. a reduction in total throughput but certainly more suitable for my workload. Is this a real phenomenon? Or is my synthetic test too simplistic? The reason this could happen seems clear enough, when the scheduler switches from reads to writes, it can run heaps of write requests because they all just land in the controllers cache but must be carried out at some point. I would guess the actual disk writes are occuring when the scheduler starts trying to perform reads again, resulting in very few read requests being executed. This seems a reasonable explanation, but it also seems like a massive drawback to using writeback cache on an system with non-trivial write loads. I've been searching for discussions around this all afternoon and found nothing. What am I missing?

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  • Updating Samba From RPMs

    - by KnickerKicker
    My Red Hat Enterprise Edition 4 comes with Samba Version 3.0.10, which does not have support for the "inherit owner" attribute that is essential in implementing a Deny-Delete Write Once Read Many share (for examples, search google for a-shared-drop-box-using-samba). (BTW, if any body knows an alternative way to do it without updating samba, I'm all ears!) I am not all that comfortable building from source, and after hours of googling (no, I do not have a red hat subscription, so I cannot just run the up2date command), I found a whole bunch of rpms on http://ftp.sernet.de/pub/samba/tested/rhel/4/i386/ (Samba 3.2.15 for RHEL 4)... Next, I tried updating them with the rpm -U --nodeps command, but I got file conflict errors. So I went ahead and overwrote everything (or so I thought) by using the rpm's --force option. But no good has come of all that. /usr/sbin/smbd -V still returns the old version. As of now, rpm -qa | grep samba returns, samba3-client-3.2.15-40.el4 samba-3.0.10-1.4E.2 samba-client-3.0.10-1.4E.2 system-config-samba-1.2.21-1 samba3-3.2.15-40.el4 samba-common-3.0.10-1.4E.2 samba3-winbind-3.2.15-40.el4 I cannot remove the older ones because samba-common >= 3.0.8-0.pre1.3 is needed by (installed) gnome-vfs2-smb-2.8.2-8.2.x86_64 libsmbclient.so.0()(64bit) is needed by (installed) kdebase-3.3.1-5.8.x86_64 libsmbclient.so.0()(64bit) is needed by (installed) gnome-vfs2-smb-2.8.2-8.2.x86_64 Now thats a whole bunch of dependencies that I dare not touch :) Any and all pointer are welcome at this stage. Thanks in advance!

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  • Nexus One WiFi connection problems.

    - by sunocky
    I have two new Nexus One for a research project. For the projects I need to keep a server running on the phone. But soon I found out that both the phones have inconsistent WiFi connection problems at my home. It can connect to my WiFi network, but will drop off in a random time. And in order to reconnect to my WiFi, I may need to reboot my router, or the phone will say "obtaining IP address" and then "Unsuccessful". I also own a G1 with firmware version 1.6, it has no such connection problems. Well, to my surprise, the two Nexus One works fine with connecting to the WiFi network at my work place, which is a WEP type WiFi connection. By the way, it is a WPA type connection at my home. Anyone knows what's the problems with the Nexus One? Any suggestions on what should I do if I want to keep the WiFi connection live all the time at my home? Thanks very much!

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  • Sendmail doesn't work with iptables, even though smtp and dns are allowed

    - by tom
    I have sendmail installed on Ubuntu 10.04 solely for the use of the php mail() function. This works fine unless iptables is running (I've been using sendmail [email protected] to test this). I think that I have allowed SMTP and DNS (the script I am using to test iptables rules is below, in my version are the actual IPs of my hosts nameservers), but to no avail! iptables --flush iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT # Postgres iptables -A INPUT -p tcp --dport 5432 -j ACCEPT # Webmin iptables -A INPUT -p tcp --dport 10000 -j ACCEPT # Ping iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A OUTPUT -p icmp --icmp-type echo-reply -j ACCEPT # sendmail iptables -A INPUT -p tcp --dport 25 -m state --state NEW,ESTABLISHED -j ACCEPT iptables -A OUTPUT -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT # DNS iptables -A INPUT -p udp --sport 53 -s <nameserver1> -j ACCEPT iptables -A INPUT -p udp --sport 53 -s <nameserver2> -j ACCEPT iptables -A INPUT -p tcp --sport 53 -s <nameserver1> -j ACCEPT iptables -A INPUT -p tcp --sport 53 -s <nameserver2> -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -d <nameserver1> -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -d <nameserver2> -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -d <nameserver1> -j ACCEPT iptables -A OUTPUT -p tcp --dport 53 -d <nameserver2> -j ACCEPT iptables -A INPUT -j DROP # Add loopback iptables -I INPUT 1 -i lo -j ACCEPT

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