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• Bad Mumble control channel performance in KVM guest

  - by aef

  I'm running a Mumble server (Murmur) on a Debian Wheezy Beta 4 KVM guest which runs on a Debian Wheezy Beta 4 KVM hypervisor. The guest machines are attached to a bridge device on the hypervisor system through Virtio network interfaces. The Hypervisor is attached to a 100Mbit/s uplink and does IP-routing between the guest machines and the remaining Internet. In this setup we're experiencing a clearly recognizable lag between double-clicking a channel in the client and the channel joining action happening. This happens with a lot of different clients between 1.2.3 and 1.2.4 on Linux and Windows systems. Voice quality and latency seems to be completely unaffected by this. Most of the times the client's information dialog states a 16ms latency for both the voice and control channel. The deviation for the control channels mostly is a lot higher than the one of the voice channels. In some situations the control channel is displayed with a 100ms ping and about 1000 deviation. It seems the TCP performance is a problem here. We had no problems on an earlier setup which was in principle quite like the new one. We used Debian Lenny based Xen hypervisor and a soft-virtualised guest machine instead and an earlier version of the Mumble 1.2.3 series. The current murmurd --version says: 1.2.3-349-g315b5f5-2.1

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• Can I get a domain controller not to act as DNS for the members?

  - by rsw

  Hi, Let me try to explain my current setup. I have one linux machine acting as DHCP and DNS (dhcpd3 and bind) in my network. This works fine, all computers I hook up to the network gets an IP address and proper DNS servers set. Let's call it 10.12.0.10 However, we also have a Windows Server 2003 Domain Controller in our network to which we add our Windows computers (running XP), let's call it 10.12.0.20. I noticed that when I run 'nslookup' on one of the windows machines, it says that the primary DNS is 10.12.0.20. This have not been much of a problem since: The Windows clients are stationary The Windows server in itself point out my real DHCP/DNS, since I can reach everything specified in it However, this turns out to be a problem when we use Laptops. They connect to the domain here and gets a DNS server, but when the user travels or connect the computer from home, we hit a problem. They are connected to their internet, but their DNS is 10.12.0.20 which they can't reach since they're at home and not at the office network. I solved this by removing the register key called "NameServer" with the value 10.12.0.20, but it gets set again whenever they logon to the domain the next time (when they get back to the office). Can I somehow make the computers take whatever DNS server they are handed when connecting to the internet or a home network, instead of always trying to reach the Domain Controller?

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• cannot reach munin port on other AWS instance

  - by Amedee Van Gasse

  2 AWS instances, in the same region but different availability zones, one is in regular EC2 and the other is in VPC, both have an Elastic IP, both are 64bit Amazon Linux AMI 2014.03.1. Both are running munin-node. The instance in the VPC is running munin-cron. I have added incoming TCP and UDP port 4949 to the security groups of both instances. On the munin node, I added an allow-line with the IP address (regular expression) of the munin server to /etc/munin/munin-node.conf. I bind munin-node to any interface using host *. Then I did sudo service munin-node restart. Then I ran netstat. $ sudo netstat -at | grep munin tcp 0 0 *:munin *:* LISTEN So the port is open there. On the munin server AND on the munin node: $ nmap AMAZON-IP -p 80,4949 | grep tcp 80/tcp open http 4949/tcp closed munin On the munin node: $ nmap localhost -p 80,4949 | grep tcp 80/tcp open http 4949/tcp open munin So from the outside, the http port is open (Apache is running) but the munin port is closed. The node can't even reach the munin port on it's own public IP address, but it can on localhost. I added port 80 as a sanity check, to be sure that there is network connectivity at all. So what am I overlooking here?

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• Exclude list of specific files in wget

  - by nanker

  I am trying to download a lot of pages from a website on dial-up and it can be brutally slow. I have almost got the perfect wget command, but because I'm downloading pages from the same site wget wastes times downloading the same standard images for each page. If I know the name of the default page images, is there any way to have wget ignore and thus avoid downloading those for each and every page? Here is an example of one of the wget commands that my shell script generates into another shell script to download all of the pages: mkdir candy-canes-on-the-flannel-board-in-preschool cd candy-canes-on-the-flannel-board-in-preschool wget -p -nd -A jpg,html -k http://www.teachpreschool.org/2011/12/candy-canes-on-the-flannel-board-in-preschool/ wget -c --random-wait --timeout=30 --user-agent="Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.3) Gecko/2008092416 Firefox/3.0.3" http://www.teachpreschool.org/2011/12/candy-canes-on-the-flannel-board-in-preschool/ -O "candy-canes-on-the-flannel-board-in-preschool" rm Baby-and-Toddler.jpg Childrens-Books.jpg Creative-Art.jpg Felt-Fun.jpg Happy_Rainbow-e1338766526528.jpg index.html Language-and-Literacy.jpg Light-table-Button.jpg Math.jpg Outdoor-Play.jpg outer-jacket1-300x153.jpg preschoolspot-button-small.jpg robots.txt Science-and-Nature.jpg Signature-2.jpg Story-Telling.jpg Tags-on-Preschool.jpg Teaching-Two-and-Three-Year-olds.jpg cd ../ Now I realize the script is not likely as savvy as it could be but it is doing what I need at the moment except that you can see from the rm command that I would just like to prevent wget from downloading the files in the first place if possible. I almost forgot to mention, there are two wget commands and that is because the first one downloads the page as index.html and for some reason it does not open in my browser, however, when I open it and look at it in vim all of the page's content is there, so I am not sure why it does not open. But if I just issue the second wget command as it is then that page, same file really with an alternate name, opens up fine. Something that if I could fix would also help to streamline the process.

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• A-2-Z web hosting on Amazon AWS

  - by JDelage

  All, I am studying web dvp, and one of my classes is project-based. We have to build a functional site that demonstrate our understanding of: HTML, CSS, Javascript, php, MySQL, And potentially Ajax or some other web component. For the project, we can use a local server using WampServer and basically build the site entirely on our laptop. If I have time, I would like to create a real site, and I thought it would be a good way to familiarize myself with Amazon's AWS services. So if I purchase a domain name, can I rely on AWS to host the site from A-to-Z? I understand I can use AWS to host content, the database, and do the background computations, if needed. What else do I need and what are the parts that AWS cannot help me with? Second, is there good documentation for a beginner to navigate AWS and learn how to use it (either on Amazon, or some 3rd party sites, or even a good book, as long as is up to date). The ideal documentation would be a tutorial on creating a web site from a-to-z on AWS, as detailed as possible. As you can guess, I have limited understanding of the IT issues. I have 0 Linux or sysadmin experience, but this is a good opportunity to change that. I hope you can help me. Thank you, JDelage PS: Please keep the answers AWS-specific. At this point, I am only interested in alternative services to the extent that they plug a hole in Amazon's offering.

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• python reports socket in use, netstat and others claim its not

  - by captainmish

  We have a strange socket issue with a RHES3 box: Python 2.4.1 (#1, Jul 5 2005, 19:17:11) [GCC 3.2.3 20030502 (Red Hat Linux 3.2.3-52)] Type "help", "copyright", "credits" or "license" for more information. >>> import socket >>> s = socket.socket() >>> s.bind(('localhost',12351)) Traceback (most recent call last): File "<stdin>", line 1, in ? File "<string>", line 1, in bind socket.error: (98, 'Address already in use') This seems normal, lets see what has that socket: # netstat -untap | grep 12351 {no output} # grep 12351 /proc/net/tcp {no output} # lsof | grep 12351 {no output} # fuser -n tcp 12351 {no output, repeating the python test fails again} # nc localhost 12351 {no output} # nmap localhost 12351 {shows port closed} Other high ports work fine (eg 12352 works) Is there something magic about this port? Is there somewhere else I can look? Where does python find out that socket is in use that netstat doesnt know about? Any other way I can find out what/if that socket is?

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• Display with intel integrated graphics, bitcoin mine with Radeon 6950

  - by karategeek6

  I'm on Ubuntu Linux 11.04 64 bit. I have an intel i5 with integrated graphics and a Radeon 6950, with one monitor. I would like to run my graphics on the integrated card, and run bitcoin mining on the 6950. I have bitcoin mining working when I use the 6950 for both display and mining. Every time I try and and use the integrated graphics instead, OpenCL doesn't recognize my 6950. Using aticonfig --initial when using the integrated graphics for display breaks things. So I used the xorg.conf it created as a basis and tried to manually edit it. I really don't know what I'm doing, though. My last attempt is given below. The graphics ran off the integrated card, but the 6950 wasn't recognized. Any help would be greatly appreciated! xorg.conf: #Section "ServerLayout" # Identifier "Intel Layout" # Screen "Default Screen" # Identifier "aticonfig Layout" # Screen "aticonfig-Screen[0]-0" # Screen 0 "aticonfig-Screen[0]-0" 0 0 #EndSection Section "Module" Load "glx" EndSection # Intel Section "Device" Identifier "Intel Integrated Graphics" Driver "intel" BusID "PCI:0:2:0" EndSection Section "Monitor" Identifier "Default Monitor" Option "VendorName" "Monitor Vendor" Option "ModelName" "Monitor Name" Option "DPMS" "true" EndSection Section "Screen" Identifier "Default Screen" Device "Intel Integrated Graphics" Monitor "Default Monitor" DefaultDepth 24 EndSection # ATI Section "Device" Identifier "aticonfig-Device[0]-0" Driver "fglrx" BusID "PCI:1:0:0" EndSection Section "Monitor" Identifier "aticonfig-Monitor[0]-0" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection Section "Screen" Identifier "aticonfig-Screen[0]-0" Device "aticonfig-Device[0]-0" Monitor "aticonfig-Monitor[0]-0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection

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• Is there a tool that can test what SSL/TLS cipher suites a particular website offers?

  - by Jeremy Powell

  Is there a tool that can test what SSL/TLS cipher suites a particular website offers? I've tried openssl, but if you examine the output: $ echo -n | openssl s_client -connect www.google.com:443 CONNECTED(00000003) depth=1 /C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA verify error:num=20:unable to get local issuer certificate verify return:0 --- Certificate chain 0 s:/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com i:/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA 1 s:/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority --- Server certificate -----BEGIN CERTIFICATE----- MIIDITCCAoqgAwIBAgIQL9+89q6RUm0PmqPfQDQ+mjANBgkqhkiG9w0BAQUFADBM MQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkg THRkLjEWMBQGA1UEAxMNVGhhd3RlIFNHQyBDQTAeFw0wOTEyMTgwMDAwMDBaFw0x MTEyMTgyMzU5NTlaMGgxCzAJBgNVBAYTAlVTMRMwEQYDVQQIEwpDYWxpZm9ybmlh MRYwFAYDVQQHFA1Nb3VudGFpbiBWaWV3MRMwEQYDVQQKFApHb29nbGUgSW5jMRcw FQYDVQQDFA53d3cuZ29vZ2xlLmNvbTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC gYEA6PmGD5D6htffvXImttdEAoN4c9kCKO+IRTn7EOh8rqk41XXGOOsKFQebg+jN gtXj9xVoRaELGYW84u+E593y17iYwqG7tcFR39SDAqc9BkJb4SLD3muFXxzW2k6L 05vuuWciKh0R73mkszeK9P4Y/bz5RiNQl/Os/CRGK1w7t0UCAwEAAaOB5zCB5DAM BgNVHRMBAf8EAjAAMDYGA1UdHwQvMC0wK6ApoCeGJWh0dHA6Ly9jcmwudGhhd3Rl LmNvbS9UaGF3dGVTR0NDQS5jcmwwKAYDVR0lBCEwHwYIKwYBBQUHAwEGCCsGAQUF BwMCBglghkgBhvhCBAEwcgYIKwYBBQUHAQEEZjBkMCIGCCsGAQUFBzABhhZodHRw Oi8vb2NzcC50aGF3dGUuY29tMD4GCCsGAQUFBzAChjJodHRwOi8vd3d3LnRoYXd0 ZS5jb20vcmVwb3NpdG9yeS9UaGF3dGVfU0dDX0NBLmNydDANBgkqhkiG9w0BAQUF AAOBgQCfQ89bxFApsb/isJr/aiEdLRLDLE5a+RLizrmCUi3nHX4adpaQedEkUjh5 u2ONgJd8IyAPkU0Wueru9G2Jysa9zCRo1kNbzipYvzwY4OA8Ys+WAi0oR1A04Se6 z5nRUP8pJcA2NhUzUnC+MY+f6H/nEQyNv4SgQhqAibAxWEEHXw== -----END CERTIFICATE----- subject=/C=US/ST=California/L=Mountain View/O=Google Inc/CN=www.google.com issuer=/C=ZA/O=Thawte Consulting (Pty) Ltd./CN=Thawte SGC CA --- No client certificate CA names sent --- SSL handshake has read 1777 bytes and written 316 bytes --- New, TLSv1/SSLv3, Cipher is AES256-SHA Server public key is 1024 bit Compression: NONE Expansion: NONE SSL-Session: Protocol : TLSv1 Cipher : AES256-SHA Session-ID: 748E2B5FEFF9EA065DA2F04A06FBF456502F3E64DF1B4FF054F54817C473270C Session-ID-ctx: Master-Key: C4284AE7D76421F782A822B3780FA9677A726A25E1258160CA30D346D65C5F4049DA3D10A41F3FA4816DD9606197FAE5 Key-Arg : None Start Time: 1266259321 Timeout : 300 (sec) Verify return code: 20 (unable to get local issuer certificate) --- it just shows that the cipher suite is something with AES256-SHA. I know I could grep through the hex dump of the conversation, but I was hoping for something a little more elegant. I would prefer Linux tools, but Windows (or other) would be fine. This question is motivated by the security testing I do for PCI and general penetration testing. Update: GregS points out below that the SSL server picks from the cipher suites of the client. So it seems I would need to test all cipher suites one at a time. I think I can hack something together, but is there a tool that does particularly this?

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• PhpMyAdmin import/export - strange character encoding issues.

  - by John Hunt

  Hello, I'm migrating a site to a new host, and there are a couple of databases on there. There's no SSH access so I'm stuck with phpmyadmin. The issue is that certain characters (namely just whitespace) seems to being corrupt on the new site (same html, and apache doesn't seem to be messing with any encodings - you can see the strange characters have changed when I use less on my linux machine after downloading a table dump from both servers.) The issue isn't as bad if I import into the new database as utf-8 - whitespace characters only have one funny A type symbol instead of two. I've been trying various combinations of character encoding etc to no avail. Exporting from: phpMyAdmin 2.6.2 MySQL 4.1.20 MySQL connection collation: utf8_general_ci MySQL charset: UTF-8 Unicode (utf8) Collation on tables and their fields is: latin1_swedish_ci Importing to: phpMyAdmin - 2.11.9.2 MySQL client version: 5.0.45 MySQL charset: UTF-8 Unicode (utf8) MySQL connection collation: utf8_general_ci The import sql has this kind of thing in it: ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=192 ; I get the impression this is actually a bug or something with mysqldump as nothing seems to work.. does anyone have any insight into this? Cheers, John.

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• Postfix cannot deliver mail to Cyrus mailbox on Ubuntu 11.10 server

  - by user105804

  I have installed and configured Postfix and Cyrus IMAP server with webcyradm according to this document - http://www.delouw.ch/linux/Postfix-Cyrus-Web-cyradm-HOWTO/html/index.html . I can access webcyradm interface, I can create new domains and new users, and I can login via IMAP after creating the user account. However, Postfix fails to deliver mail to cyrus mailboxes. Mail log contains errors shown below. Installing any IMAP server other than cyrus is not an option because it is needed by the web application. Please advise me how to make Postfix deliver email to cyrus mailboxes. The solution should not necessary include web-cyradm, but there should be a web interface for managing mail domains and mailboxes as user-friendly as possible. Dec 30 22:46:17 acer-tower cyrus/lmtpunix[4865]: accepted connection Dec 30 22:46:17 acer-tower cyrus/lmtpunix[4865]: lmtp connection preauth'd as postman Dec 30 22:46:17 acer-tower postfix/cleanup[4868]: 065D5240035: message-id=<[email protected]> Dec 30 22:46:17 acer-tower cyrus/lmtpunix[4865]: verify_user(user.imap0001) failed: Mailbox does not exist Dec 30 22:46:17 acer-tower postfix/bounce[4867]: 6C6CA24185C: sender non-delivery notification: 065D5240035 Dec 30 22:46:17 acer-tower postfix/qmgr[4833]: 065D5240035: from=<>, size=3372, nrcpt=1 (queue active) Dec 30 22:46:17 acer-tower postfix/qmgr[4833]: 6C6CA24185C: removed Dec 30 22:46:17 acer-tower postfix/lmtp[4866]: 53421240372: to=<[email protected]>, orig_to=<[email protected]>, relay=home.webshop-software.ch[/tmp/lmtp], delay=165, delays=165/0.02/0.17/0.09, dsn=5.1.1, status=bounced (host home.webshop-software.ch[/tmp/lmtp] said: 550-Mailbox unknown. Either there is no mailbox associated with this 550-name or you do not have authorization to see it. 550 5.1.1 User unknown (in reply to RCPT TO command))

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• 10 GigE interfaces limits single connection throughput to 1 Gb on a ProCurve 4208vl

  - by wazoox

  The setup is as follow : 3 Linux servers with Intel CX4 10 GigE controllers and an X-Serve with a Myricom 10 GigE CX4 controller are connected to a ProCurve 4208vl switch, with a myriad of other machines connected through good ol' 1000 base-T. The interfaces are actually set up as 10 Gig, according to both the switch monitoring interface and the servers (ethtool, etc). However a single connection between two 10 GigE equipped machines through the switch is limited to exactly 1Gb. If I connect two of the 10 GigE machines directly with a CX4 cable, netperf reports the link bandwidth as 9000 Mb/s. NFS achieves about 550 MB/s transfers. But when I'm using the switch, the connection tops at 950 Mb/s through netperf and 110 MB/s with NFS. When I open several connections from 3 of the machines to the 4th, I get 350 MB/s of NFS transfer speed. So each individual 10 GigE ports actually can reach much more than 1 Gb, but individual connections are strictly limited to 1 Gb. Conclusion : the 10 GigE connection through the switch behaves exactly like a trunk of 10 1 Gb connections. That doesn't make any sense to me, unless HP planned these ports only for cascading switches or strictly for many-clients-to-single-server connection. Unfortunately this is NOT the envisioned setup, we need big throughput from machine to machine. Is this a not-so-known (or carefully hidden...) limitation of this type of switch? Should I suggest seppuku to the HP representative? Does anyone have any idea on how to enable a proper behaviour ? I upgraded for an hefty price from bonded 1Gb links to 10 GigE and see exactly ZERO gain! That's absolutely unacceptable.

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• Solaris 10: How to image a machine?

  - by nonot1

  I've got a Solaris 10 workstation that I'd like to create a full image backup from. The machine has 2 drives, one UFS for system root, and 1 ZFS for data storage. I intend to add a third HD to keep the backup images of both primary drives (including any zfs snapshots). The purpose is not disaster recovery, but rather to allow me to easily blow away a series of application installation/configuration changes I intend to try. What's the best way to do this? I'm not too familiar with Solaris, but have some basic Linux knowledge. I looked at CloneZilla, but it does not support Solaris. I'm OK with just a dd | gzip > image style solution, but I'd need some way to first zero-out the non-used blocks on the primary drives to aid gzip. They are are much larger than my 3rd drive, but hardly have any real data. Update to clarify: I specifically want to avoid using any file-system snapshot functionality, because part of the app configuration changes involve/depend slightly on existing and new snapshots. Ideally the full collection of snapshots should be part of the backup. Virtualization not an option, because the goal is to do performance evaluation on a very specific HW configuration. For the same reason, the spurious "back up" snapshots could skew performance data. Thank you

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• dns in a small network with router and AD domain

  - by Felix

  I have a small office network with router (running OpenWRT), Windows Domain Controller (used to be 2008R2; I just backed it up and upgraded to 2012), about a dozen AD clients (3 server and windows workstation) and several non-AD clients (network printer, PBX). The problem is that the clients can't access servers by name (only by IP). I tried all kind of permutations. Right now domain controller runs DNS server for all desktops; but unless I put an entry in hosts file - I can only get by IP. I have router as DHCP server (since not all devices are on AD); and except for Domain Controller all IP addresses, including "static", are assigned by the router. Most frustrating, some servers sometimes just work! for example, I can often get to the Linux box by name (it is part of Domain using Beyond Trust Integration Services); but I can never get to SQL Server box. Seems like non-domain devices see more names than domain members... This network should be fairly typical; but I couldn't get any guidance about how to set up DNS/DHCP service to make all nodes happy. The closest is this question, but still it's different! Thanks

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• How to access remote network resource from local machine

  - by jerluc

  I just configured VPN access successfully so that I now can connect to my workstation at work from my personal Linux box at home. The problem is that all of my dev files for a server I'm locally running are on my personal box and cannot be transfered to my workstation (at least not in any timely manner over this connection given the amount of data, in addition to the many reconfigurations which would be required for the server to run even if I could somehow get the files across). So essentially, I am able to run my server locally on my personal computer, however, the data-sources required for the back-end are accessible only from within the office's network. But is there some way for me to somehow either access the data-sources directly through a VPN connection or even if I need to be a bit more convoluted by connecting via VPN to my workstation and then somehow connecting to the data-sources through my workstation to my personal computer? And here I could really care less about the speed of the connection from my server to the data-sources since they will probably only be fetched a few times every hour or so. Thanks! Sorry if this a stupid question and/or doesn't make any sense! (And sorry for anyone who read this at stackoverflow, I posted it in the wrong area.)

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• Want to use something like Citrix XenDesktop, Free Alternative?

  - by Chris

  I'm looking to go into IT, general office server management, and it looks like XenDesktop would be a awesome tool to use. If I get it right, you would store a central image of the OS you want to deploy (in an iso file) on the main server. Then use XenDesktop to pull that image down to the client, and it will then boot the OS inside of the virtual machine. Does it download the image of the OS and store it locally (like cloning the VM onto the client?) I'd love to find a free (possibly open source?) alternative to this, I keep on hearing about KVM in Linux and PXE booting a minimalistic OS to use remote KVMs.... Would that be what I'm looking for? Ideally, I'd like a system.. - That allows me to manage one central image for multiple clients (virtualized hardware) - Easily boot a thin client OS that connected to XenDesktop. Would those things be possible with some kind of free alternative? Some guidance would be greatly appreciated.

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• Website Use Monitoring for 3 People

  - by linkedlinked

  I work in an IT startup with 2 partners, and I'm the programmer/IT guy -- in other words, the work horse. To make a long story short, I'm doing most of the work right now, while they spend all day on Facebook. That's OK, because they're paying my salary, but if the project fails, I'm sure they'll blame me for it (I'm doing my best to make sure that doesn't happen!), and I want some sort of recourse. I already have an app that blocks time-wasters on my local PC, and keeps logs of when the app is enabled (so I can say "I had Facebook blocked from 9am-5pm today.") Is there any way I can get a brief summary of the most heavily visited sites, split up by client PC? At the end of the month, I want to be able to say "You both load Facebook, on average, every 10 minutes. You spend hours a day on Youtube, and haven't opened up our bugtracker in weeks" and maybe have a nifty chart or graph to match it. We have a crappy D-Link router, and no IT budget. They are both on Windows Vista, I run Ubuntu Linux. I don't want to install any monitoring software on their PC, but I'm totally fine with, say, routing all the network traffic through my machine. I guess I can think of lots of ways to accomplish this (telnet into JSSH and list open tabs? log all the DNS requests, per-domain? even thinking of setting up a webcam on my desk and just keeping 5-minute snapshots...), I just don't really know where to start. Any advice is appreciated, thanks!

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• trouble shooting ntfs-loop-xen combination in wubi based grub of Ubuntu

  - by Registered User

  Here is a situation I installed Ubuntu on a laptop using Wubi in Windows 7 drive.*The laptop is not mine.*I have installed and things worked by now perfectly without any problem.We are trying to set up a Xen (virtualization)environment in this laptop. After setting up every thing cleanly.When I needed to boot with following grub entries menuentry "Xen Linux 2.6.32.27" { insmod ntfs set root='(hd0,2)' loopback loop0 /ubuntu/disks/root.disk set root=(loop0) multiboot /boot/xen.gz module /boot/vmlinuz-2.6.32.27 dummy=dummy root=/dev/sda2 loop=/ubuntu/disks/root.disk ro console=tty0 module /boot/initrd.img-2.6.32.27 } I got error file not found error unknown command 'multiboot' error unknown command 'module' error unknown command 'module' Now to dig this issue further I reboot the machine and go to grub command prompt and manually pass on each of the above parameters which you see in the grub entry when I reached grub> insmod multiboot then I got following message on screen error:file not found. It looks like this wubi+ grub setup has just enough modules to use loopback file on ntfs, but the ACTUAL /boot directory is on the loopback NOT ntfs (hd0,2). Therefore any attempt to read any files from (hd0,2) simply wont work, cause there's no file there.I need to use insmod multiboot and command multiboot and module which are available in grub on a normal install without Wubi.But since the laptop is not mine so I am not allowed to partition it and have to make it work in this situation only. While a normal Kernel is still booting? How can I get module multiboot in this Wubi based install.

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• what is this kicker process that shows up when i do top?

  - by rashid

  This morning when I came to my office i noticed the machine very slow so I did 'top' at the terminal and i see at least 50 process running and they are "kicker-3.4-reve"!!! I am using RedHat Linux It is taking up memory, how do I get rid of it? How could this happen and how can I avoid it fro happening again? (There is no point in pasting the whole thing but here is a glimpse) 31508 <user> 25 0 87212 8388 7144 S 3 0.1 1:48.34 kicker-3.4-reve 31675 <user> 25 0 87212 8384 7144 S 3 0.1 1:45.74 kicker-3.4-reve 31708 <user> 25 0 87212 8384 7144 S 3 0.1 1:45.04 kicker-3.4-reve 31915 <user> 25 0 87212 8388 7144 S 3 0.1 1:45.74 kicker-3.4-reve 31928 <user> 25 0 87212 8388 7144 S 3 0.1 1:45.74 kicker-3.4-reve 31930 <user> 25 0 87212 8388 7144 S 3 0.1 1:45.74 kicker-3.4-reve 31960 <user> 25 0 87212 8384 7144 S 3 0.1 1:47.14 kicker-3.4-reve 32050 <user> 25 0 87212 8392 7144 S 3 0.1 1:44.24 kicker-3.4-reve 32053 <user> 25 0 87212 8384 7144 S 3 0.1 1:44.24 kicker-3.4-reve 32168 <user> 25 0 87212 8392 7144 S 3 0.1 1:45.34 kicker-3.4-reve

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• Can I get all active directory passwords in clear text using reversible encryption?

  - by christian123

  EDIT: Can anybody actually answer the question? Thanks, I don't need no audit trail, I WILL know all the passwords and users can't change them and I will continue to do so. This is not for hacking! We recently migrated away from a old and rusty Linux/Samba domain to an active directory. We had a custom little interface to manage accounts there. It always stored the passwords of all users and all service accounts in cleartext in a secure location (Of course, many of you will certainly not think of this a being secure, but without real exploits nobody could read that) and disabled password changing on the samba domain controller. In addition, no user can ever select his own passwords, we create them using pwgen. We don't change them every 40 days or so, but only every 2 years to reward employees for really learning them and NOT writing them down. We need the passwords to e.g. go into user accounts and modify settings that are too complicated for group policies or to help users. These might certainly be controversial policies, but I want to continue them on AD. Now I save new accounts and their PWGEN-generated (pwgen creates nice sounding random words with nice amounts of vowels, consonants and numbers) manually into the old text-file that the old scripts used to maintain automatically. How can I get this functionality back in AD? I see that there is "reversible encryption" in AD accounts, probably for challenge response authentication systems that need the cleartext password stored on the server. Is there a script that displays all these passwords? That would be great. (Again: I trust my DC not to be compromised.) Or can I have a plugin into AD users&computers that gets a notification of every new password and stores it into a file? On clients that is possible with GINA-dlls, they can get notified about passwords and get the cleartext.

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• Blocking an IP in Webmin

  - by Dan J

  I've been checking my /var/log/secure log recently and have seen the same bot trying to brute force onto my Centos server running webmin. I created a chain + rule in Networking - Linux Firewall: Drop If source is 113.106.88.146 But I'm still seeing the attempted logins in the log: Jun 6 10:52:18 CentOS5 sshd[9711]: pam_unix(sshd:auth): check pass; user unknown Jun 6 10:52:18 CentOS5 sshd[9711]: pam_succeed_if(sshd:auth): error retrieving information about user larry Jun 6 10:52:19 CentOS5 sshd[9711]: Failed password for invalid user larry from 113.106.88.146 port 49328 ssh2 Here is the contents of /etc/sysconfig/iptables: # Generated by webmin *filter :banned-ips - [0:0] -A INPUT -p udp -m udp --dport ftp-data -j ACCEPT -A INPUT -p udp -m udp --dport ftp -j ACCEPT -A INPUT -p udp -m udp --dport domain -j ACCEPT -A INPUT -p tcp -m tcp --dport 20000 -j ACCEPT -A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT -A INPUT -p tcp -m tcp --dport https -j ACCEPT -A INPUT -p tcp -m tcp --dport http -j ACCEPT -A INPUT -p tcp -m tcp --dport imaps -j ACCEPT -A INPUT -p tcp -m tcp --dport imap -j ACCEPT -A INPUT -p tcp -m tcp --dport pop3s -j ACCEPT -A INPUT -p tcp -m tcp --dport pop3 -j ACCEPT -A INPUT -p tcp -m tcp --dport ftp-data -j ACCEPT -A INPUT -p tcp -m tcp --dport ftp -j ACCEPT -A INPUT -p tcp -m tcp --dport domain -j ACCEPT -A INPUT -p tcp -m tcp --dport smtp -j ACCEPT -A INPUT -p tcp -m tcp --dport ssh -j ACCEPT -A banned-ips -s 113.106.88.146 -j DROP COMMIT # Completed # Generated by webmin *mangle :FORWARD ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed # Generated by webmin *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed

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• Configuring three monitors with two Radeon X1600/X1650 graphics cards under Ubuntu

  - by cpm

  I have three SyncMaster 932a monitors I want to use with two Radeon X1600/X1650 cards under Linux. I am running X.org X Server 1.6.0, as provided by Ubuntu's Wubi installer. After turning off mirroring, I ended up with this xorg.conf: Section "Monitor" Identifier "Configured Monitor" EndSection Section "Screen" Identifier "Default Screen" Monitor "Configured Monitor" Device "Configured Video Device" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Device" Identifier "Configured Video Device" EndSection The left monitor had a menu bar and a task bar, the center monitor was just desktop, and windows would maximize to the current monitor. The third monitor and second graphics card weren't being used at all. Then I changed my configuration to manually specify each card with their PCI bus: Section "ServerLayout" Identifier "TheLayout" Screen 0 "Radeon Screen 1" Screen 1 "Radeon Screen 2" RightOf "Radeon Screen 1" EndSection Section "Screen" Identifier "Radeon Screen 1" Monitor "Configured Monitor" Device "Radeon the First" SubSection "Display" Virtual 2560 1024 EndSubSection EndSection Section "Screen" Identifier "Radeon Screen 2" Monitor "Configured Monitor" Device "Radeon the Second" EndSection Section "Device" Identifier "Radeon the First" Driver "radeon" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Radeon the Second" Driver "radeon" BusID "PCI:2:0:0" EndSection Section "Monitor" Identifier "Configured Monitor" EndSection Now both the left and right monitors have task bars and menu bars. Windows cannot be dragged from the first two monitors to the third monitor. Also, maximizing in the left or center window fills both monitors. I also tried adding Option "Xinerama" "true" to the ServerLayout section. X11 wasn't able to start up. I want to: Allow moving windows along all three monitors. Maximizing only fills the current monitor. Either have menu/task bars on only the left monitor or all three monitors How can I make this possible?

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• MicroSD card getting corrupted for no good reason

  - by ChaosR

  I recently bought an MicroSD card online. It's a Sandisk 16GB class 2. However, it has a nasty problem. Every time I fill it with my data, the fat tables get corrupted. I've tried reformatting it, blanking it, doesn't seem to solve the problem. I have tried windows and linux (ubuntu), both have the problem. I've used my usb microsd readers, and even tried putting it in my phone and putting data on it from there. All have this problem. Now the really odd thing is, besides the corrupted file tables, no programs can find anything wrong with the hardware. I've tried both chkdisk and "badblocks -w", neither give any type of error. Now I don't know if the actual data gets corrupted, or if its just filesystem tables. What happens is that one or more folders start showing a load of chinese-charred (random UTF8 symbols I suppose) folders and files, and it is impossible to do anything with those. All the other data (outside of the corrupted folders) seems fine. I've tried to test it, and the problem doesn't seem to show up until I fill the disk upto about 3~4GB. After that I can still access the data. But as soon as I eject/safely remove/unmount it, the bad things happen somehow. Next time I plug it in, the folders I most recently wrote to (but sometimes also the folders I wrote the time before last time to) are all gibberish. Does anybody have any clue what might be going on here? EDIT: It seems I can't even put ext3 or ext4 on it, they both complain about a corrupted journal. Gheh, guess something is really broken here.

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• NTLM, Kerberos and F5 switch issues

  - by G33kKahuna

  I'm supporting an IIS based application that is scaled out into web and application servers. Both web and applications run behind IIS. The application is NTLM capable when IIS is configured to authenticate via Kerberos. It's been working so far without a glitch. Now, I'm trying to bring in 2 F5 switches, 1 in front of the web and another in front of the application servers. 2 F5 instances (say ips 185 & 186) are sitting on a LINUX host. F5 to F5 looks for a NAT IP (say ips 194, 195 and 196). Created a DNS entry for all IPs including NAT and ran a SETSPN command to register the IIS service account to be trusted at HTTP, HOST and domain level. With the Web F5 turned on and with eachweb server connecting to a cardinal app server, when the user connects to the Web F5 domain name, trust works and user authenticates without a problem. However, when app load balancer is turned on and web servers are pointed to the new F5 app domain name, user gets 401. IIS log shows no authenticated username and shows a 401 status. Wireshark does show negotiate ticket header passed into the system. Any ideas or suggestions are much appreciated. Please advice.

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• Running phpmyadmin xampp Ubuntu 12.10

  - by Luigi Tiburzi

  I know it is a common problem and there are many solutions on the web but I'm trying everything and anything is working, I can't have phpmyadmin running on my machine. I installed XAMPP through: sudo tar xvfz ./Downloads/xampp-linux-1.8.1.tar.gz -C /opt then I did the chmod trick supposed to make an end to access issues and I change the default location to my php projects from /var/www to Dropbox/php. Then I started XAMPP in the usual way: sudo /opt/lampp/lampp start When I tried to run one of my php projects the output on the web is fine but if for example I try to write localhost on my browser I get: It works and not the usual XAMPP interface and most of all when I try to access localhost/phpmyadmin I get the login page, insert username (root) and password and I get: You don't have permission to access /phpmyadmin/index.php on this server. Apache/2.2.22 (Ubuntu) Server at localhost Port 80 I tried the Required all granted trick and some others but nothing is working. I even tried to uninstall phpmyadmin and reinstall it but this is not working too. I don't know hot to proceed. Thanks for your help.

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• lsof not showing what port a proc is listening on

  - by ericslaw

  I have many processes on a box listening on several ports. I am trying to map ports to pids. The problem is that lsof is not telling me what ports belong to which process. Given an apache listening on port 80, I can see it listening via netstat: user@host% netstat -an|grep LISTEN|grep 80 *.80 *.* 0 0 49152 0 LISTEN But when I try to map port 80 to a pid I get nothing: user@host% lsof -iTCP:80 -t When I try seeing what sockets that specific pid is using I get: user@host% lsof -lnP -p31 -a -i COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME libhttpd. 31 0 15u IPv4 0x6002d970b80 0t0 TCP *:65535 (LISTEN) Notice the *:65535 in the NAME column. Does anyone know why lsof is not reporting the port in use? I am running as root. I am using a mix of lsof and os versions: lsof v4.77 on Solaris10 sparc lsof v4.72 on Redhat4.2 etc I know that linux solutions can use "netstat -p", so I guess I'm only looking for why solaris isn't working, but I find lsof is frequently silent and not showing me expected data.

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