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• Two DHCP servers on the same network

  - by CesarGon

  We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, the other one uses private), but the goal is having a single Windows Server domain across the gap between the buildings. The link is provided by a 100-Mbps point-to-point line. I have always understood that you should not have more than one DHCP server on a network. However, we are planning to put a domain controller on each building, and each domain controller will be a DNS server and a DHCP server as well. The intention is that a machine booting up in building A gets its IP address from the DHCP server closer to it, in building A, while a machine booting up in building B gets an address from the DHCP server in building B. Since the two buildings will be linked and the network will be only one, will this work? How can I avoid that a machine booting up in building A gets an address from the DHCP server in building B (or vice versa)? Thanks.

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• Two DHCP servers on the same network

  - by CesarGon

  We are setting up a routing link between the Windows Server 2008 networks of two different buildings in my organisation. Each network uses a different IP addressing scheme (one uses public addresses, the other one uses private), but the goal is having a single Windows Server domain across the gap between the buildings. The link is provided by a 100-Mbps point-to-point line. I have always understood that you should not have more than one DHCP server on a network. However, we are planning to put a domain controller on each building, and each domain controller will be a DNS server and a DHCP server as well. The intention is that a machine booting up in building A gets its IP address from the DHCP server closer to it, in building A, while a machine booting up in building B gets an address from the DHCP server in building B. Since the two buildings will be linked and the network will be only one, will this work? How can I avoid that a machine booting up in building A gets an address from the DHCP server in building B (or vice versa)? Thanks.

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• Break all hardlinks within a folder

  - by Georges Dupéron

  I have a folder which contains a certain number of files which have hard links (in the same folder or somewhere else), and I want to de-hardlink these files, so they become independant, and changes to their contents won't affect any other file (their link count becomes 1). Below, I give a solution which basically copies each hard link to another location, then move it back in place. However this method seems rather crude and error-prone, so I'd like to know if there is some command which will de-hardlink a file for me. Crude answer : Find files which have hard links (Edit: To also find sockets, etc. that have hardlinks, use find -not -type d -links +1) : find -type f -links +1 A crude method to de-hardlink a file (copy it to another location, and move it back) : Edit: As Celada said, it's best to do a cp -p below, to avoid loosing timestamps and permissions. Edit: Create a temporary directory and copy to a file under it, instead of overwriting a temp file, it minimizes the risk to overwrite some data, though the mv command is still risky (thanks @Tobu). # This is unhardlink.sh set -e for i in "$@"; do temp="$(mktemp -d ./hardlnk-XXXXXXXX)" [ -e "$temp" ] && cp -ip "$i" "$temp/tempcopy" && mv "$temp/tempcopy" "$i" && rmdir "$temp" done So, to un-hardlink all hard links (Edit: changed -type f to -not -type d, see above) : find -not -type d -links +1 -print0 | xargs -0 unhardlink.sh

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• Setting up MongoDB in High Performance Computing LSF linux cluster

  - by Dnaiel

  I am trying to run mongo in a LSF cluster computing environment where I have no admin control. Our sysadmin installed mongodb, but it is not running. Any ideas on what should I ask the server admin to do for it to run? Or if I could run it locally? [node1382]allelix> mongod --dbpath /users/dnaiel/ma/mongodb/ Tue Oct 2 21:33:48 [initandlisten] MongoDB starting : pid=22436 port=27017 dbpath=/seq/epigenome01/allelix/ma/mongodb/ 64-bit host=node1382 Tue Oct 2 21:33:48 [initandlisten] Tue Oct 2 21:33:48 [initandlisten] ** WARNING: You are running on a NUMA machine. Tue Oct 2 21:33:48 [initandlisten] ** We suggest launching mongod like this to avoid performance problems: Tue Oct 2 21:33:48 [initandlisten] ** numactl --interleave=all mongod [other options] Tue Oct 2 21:33:48 [initandlisten] Tue Oct 2 21:33:48 [initandlisten] db version v2.2.0, pdfile version 4.5 Tue Oct 2 21:33:48 [initandlisten] git version: f5e83eae9cfbec7fb7a071321928f00d1b0c5207 Tue Oct 2 21:33:48 [initandlisten] build info: Linux ip-10-2-29-40 2.6.21.7-2.ec2.v1.2.fc8xen #1 SMP Fri Nov 20 17:48:28 EST 2009 x86_64 BOOST_LIB_VERSION=1_49 Tue Oct 2 21:33:48 [initandlisten] options: { dbpath: "/users/dnaiel/ma/mongodb/" } Tue Oct 2 21:33:48 [initandlisten] journal dir=users/dnaiel/ma/mongodb/journal Tue Oct 2 21:33:48 [initandlisten] recover begin Tue Oct 2 21:33:48 [initandlisten] info no lsn file in journal/ directory Tue Oct 2 21:33:48 [initandlisten] recover lsn: 0 Tue Oct 2 21:33:48 [initandlisten] recover /seq/epigenome01/allelix/ma/mongodb/journal/j._0 Tue Oct 2 21:33:48 [initandlisten] recover cleaning up Tue Oct 2 21:33:48 [initandlisten] removeJournalFiles Tue Oct 2 21:33:48 [initandlisten] recover done Tue Oct 2 21:33:48 [websvr] admin web console waiting for connections on port 28017 Tue Oct 2 21:33:48 [initandlisten] waiting for connections on port 27017 It basically waits forever and cannot start mongodb. These servers are not webservers but they do have network access, it's a cloud computing LSF environment system. Any advice would be welcome, thanks in advance.

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• Digitize video?

  - by kire

  I got some movies on a VCR that i want to move to my computer somehow. (for personal use) I have a video capture card and all hardware required. I'm looking for the software - programs, codecs etc. I like the format that most torrents come in and got some of these i'd like to use as reference for comparison. How can i see what codec, bitrate, etc a movie is using so i can pick this and know that it will work and look good. For AVI-files the bitrate is visible in explorer but it doesn't mention the codec used and i also have a lot of MKV-files that explorer can't handle. All kinds of tips, tricks and other suggestions are welcome. This is completely new to me. How do I avoid that video/audio gets out of sync for example, many movies you download have audio out of sync so i guess this can happen quite easily. The encoding-program has to run on windows and for playback the movies should work on at least VLC for windows.

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• Do you known a reputable backup software that can capture ONLY file system structure + attributes, WITHOUT file content

  - by bogdan

  Is there, on Windows, a reputable backup software out there capable of capturing ONLY a file system's directory and file structure, along with each item's attributes, WITHOUT capturing the actual file content (all files should be zero-length in the backup). I thoroughly searched the web for a solution and wasn't able to find one. Scenario when this would be very useful: I have a large drive with a huge amount of files. If the drive dies, I don't care so much about the content in these files (I can always download this content again from the Internet at any time) but I do care HUGELY about the names of the files that were on it, possibly also about their MD5 hashes and other classic file attributes (especially created-date / modified-date). The functionality I need is present to an extent in "media"/file cataloging software (i.e. whereisit) and, to a lesser extent, in a Total Commander set of extensions (DiskDir, DiskDirExtended). The huge drawback with cataloging software is that it's not designed to store previous versions of each item (AFAIK) and, most importantly, it has very weak content backup capabilities. I managed to think of a hack but I hope there's some backup software out there that already has this capability and I just failed to find it, thus this question. The hack: RoboCopy could be used with /CREATE (CREATE directory tree and zero-length files only) or /COPY (what to COPY for files) without the D=Data flag, to clone a directory structure into one where all files are zero-length but have the desired attributes. Then I would backup the cloned directory structure with a reputable backup software. I would really love to avoid a hack like this one, if possible. Thanks, Bogdan

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• Acer LCD says "no signal"

  - by Ken

  I have an Acer 24" LCD (model "AL2423WDR") that's about 3 years old. It worked perfectly for most of its lifetime so far. Recently it started giving problems. When I turn it on, it either says "no signal" on the display, or the power light goes yellow (as if in power-saving mode). This happens with both DVI and VGA (both of which worked fine before), and stranger still, the 4 buttons on the front, for accessing the on-screen menus, don't do anything. I've also tried different computer hardware and software (PC/Mac, Linux/MacOS), but nothing has worked. I've tried power-cycling it (with both the power button and the power switch), and also unplugging it entirely. The nonworking buttons suggest to me an issue with the firmware. I found a place on Acer's website that says I can send it in to have it fixed, at my expense, but I'll avoid that if I can. Is there a way to fully reset it manually? Or is there something else I can try?

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• Minimum permissions needed to create a user Home Folder in Windows Active Directory

  - by Jim

  We would like the Help Desk to have the responsibility of creating User Home folders instead of our 2nd level support. The help desk global group is already an Account Operator, so in Active Directory they are able to edit all User Attributes just fine. The problem is figuring out the minimum level of permissions needed on the File Server to create the home share, with out giving them access to everyone home share. So if they open AD Users and Computer, open the properties for a user, and enter \home\users\%username% in the profile tab and then click OK, they get the following error. The \home\users\username home folder was not created because you do not have create access on the server. The user account has been updated with the new home folder value but you must create the directory manually after obtaining the required access right. Right now I have given the Helpdesk group Full Control on the root folder only (no files or subdirectories) The directory is actually created, but the permissions on the newly created folder only show administrators full control, and no permissions for the configured user account. It sure sounds like I'd have to make the helpdesk local admins on the file servers, which is what I'd like to avoid. Especially since the file servers are a large cluster hosting much much more than the entire orgs home share structure.

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• Upgrade an Ubuntu 8.04 installation with VMware Server 1.0.8 and lots of guest OSes to Something Els

  - by Glyph

  I have an Ubuntu 8.04 (Hardy Heron) host machine which is running a whole slew of virtual machines in VMWare Server 1.0.8. Among other guest OSes, there is every release version of Ubuntu since 6.06, OpenSolaris 2009.06, and Windows XP. Right now I access these VMs from a variety of client OSes as well; Linux and Windows via the VMWare server console, and MacOS via X-forwarding the host machine's server console. I'd like to upgrade the host to Ubuntu 10.04 (Lucid Lynx), but from what I can tell, getting VMWare Server 1.x to work on a more recent version of Linux is a real pain. While VMware Server 2.x is a bit easier, it's still not packaged as Debian packages, so installing security updates is a big chore. As long as I'm upgrading anyway, I'd like to move to a virtualization solution that will allow me to automate applying updates. The options that I'm aware of right now are KVM (managed via virt-manager) and VirtualBox (as managed by its own tools or via its own libvirt bindings), but I'm open to other suggestions. For each option, I'd like to know how do I convert my guest images to the new format? am I going to have to re-activate my Windows guests (alternatively, "If the virtual hardware is different by default, can I avoid re-activation by changing some virtualization configuration to provide me with more similar virtual hardware") what are the management options like for each client OS (mac, linux, windows)? Thanks.

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• why sendmail resolves to ISP domain?

  - by digital illusion

  I wish to setup a local mail server for debugging purposes using fedora 15 I set up sendmail, but there is a problem. When I'm not connected to the internet, the local mail server delivers correctly (to localhost). And in /var/log/mail I see that I correctly delivered a mail to [email protected]: Jun 21 18:24:56 PowersourceII sendmail[6019]: p5LGOttt006019: [email protected], size=328, class=0, nrcpts=1, msgid=<[email protected]>, relay=adriano@localhost Jun 21 18:24:56 PowersourceII sendmail[6020]: p5LGOuSV006020: from=<[email protected]>, size=506, class=0, nrcpts=1, msgid=<[email protected]>, proto=ESMTP, daemon=MTA, relay=PowersourceII.localdomain [127.0.0.1] Jun 21 18:24:56 PowersourceII sendmail[6019]: p5LGOttt006019: [email protected], [email protected] (500/500), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=30328, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p5LGOuSV006020 Message accepted for delivery) When I connect, networkmanager fills in /etc/resolv.conf with: domain fastwebnet.it search fastwebnet.it localdomain nameserver 62.101.93.101 nameserver 83.103.25.250 Now sendmail does not work any longer and tries to send messages to my ISP domain, as seen in the log: Jun 21 18:40:02 PowersourceII sendmail[6348]: p5LGe1LV006348: [email protected], [email protected] (500/500), delay=00:00:01, xdelay=00:00:01, mailer=relay, pri=30327, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (p5LGe10n006352 Message accepted for delivery) Jun 21 18:40:02 PowersourceII sendmail[6354]: p5LGe10n006352: to=<[email protected]>, delay=00:00:01, xdelay=00:00:00, mailer=esmtp, pri=120651, relay=mx3.fastwebnet.it. [85.18.95.21], dsn=5.1.1, stat=User unknown As you can see, it tries to deliver a mail to [email protected], and fails The setup is working under other ISPs. How can I avoid the fastweb ISP DNS relay? Thank you

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• jdbc4 CommunicationsException

  - by letronje

  I have a machine running a java app talking to a mysql instance running on the same instance. the app uses jdbc4 drivers from mysql. I keep getting com.mysql.jdbc.exceptions.jdbc4.CommunicationsException at random times. Here is the whole message. Could not open JDBC Connection for transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was25899 milliseconds ago.The last packet sent successfully to the server was 25899 milliseconds ago, which is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. For mysql, the value of global 'wait_timeout' and 'interactive_timeout' is set to 3600 seconds and 'connect_timeout' is set to 60 secs. the wait timeout value is much higher than the 26 secs(25899 msecs). mentioned in the exception trace. I use dbcp for connection pooling and here is spring bean config for the datasource. <bean id="dataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource" > <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/db"/> <property name="username" value="xxx"/> <property name="password" value="xxx" /> <property name="poolPreparedStatements" value="false" /> <property name="maxActive" value="3" /> <property name="maxIdle" value="3" /> </bean> Any idea why this could be happening? Will using c3p0 solve the problem ?

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• Red Hat server minimal install

  - by chmeee

  In a farm of virtualized Red Hat servers, there's the need to install a minimal system for security reasons. Minimal installs have serveral advantages (even no security related): Lees exposure to vulnerabilities (if you don't need it, don't install it) Better update process (less packages to update, less probability of breaking the system) Better performance (no unneeded daemons or processes) The less software you have the easier it is to harden the system Unfortunately, this is not easy because the "Minimal Installation" on Red Hat contains lots of unnecessary packages. There is an added challenge as the farm is running Oracle iAS. I've been told that iAS has dependencies with local graphical envieronment. So finally every server in the farm has gnome, X, etc. I've been searching the web and one solution seems to be making a kickstart script that will intall only the necessary packages. But I find this difficult and have several doubts about how to maintain the system dependencies afterwards. How do you install minimal Red Hat servers? Is it Ok to use kickstart or will I have dependency problems in the installation or in updates? Is there any way to avoid installing the graphical environment for iAS?

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• Create "raw disk file" from WIM file

  - by Joe Baltimore

  First timer here. I've searched around here, but haven't found a question like the one I have. Apologies if I missed it. The challenge at hand: produce a "raw disk image file" from a given WIM file. What I am pursuing so far is to use imagex.exe with the "/apply" operation to take the WIM and lay it down in a directory on a server. That seems to produce all the necessary "stuff" I need in that directory. How would I take that content and produce a "raw disk image file"? I'm told the definition of "raw disk image file" is a block-by-block copy of the disk image, which I hope is the output of the "imagex.exe /apply" command I use currently, but stored in a single file I can hand back to another system in our solution. imagex.exe /apply image.wim 1 R:\WimImagePoint I would like to take the contents of R:\WimImagePoint and produce the elusive (to me) "raw disk image file". ISO is not what they want, nor is anything requiring winPE. Any pointers? External utilities' references are welcome. Would like to avoid unmanaged code solutions as much as possible, but will entertain them if that's the only route. Also, I am not married to the idea of imagex /apply as the starting point, it's just the comfort zone so far.

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• Can Subject Alternative Name accommodate multiple virtual mail domains?

  - by Lawrence

  I am currently running a postfix server with self signed certificates serving one mail domain, mycompany.com, the mail server is mail.mycompany.com and so is the CN of the certificate. Now, I need to add a new domain to it. The new domain name is mycompany.net to the same server. Since the users already have the root of the old certificate, I'd like to reuse that. However, I'd like to issue a new certificate so users using the SMTP from Outlook/Thunderbird of mail.mycompany.net do not get warnings. If I understand correctly, if I issue a new certificate with CN=mail.mycompany.com and a subjectAltName=DNS:mail.mydomain.net and have postfix serve this, the client will not complain either way about the cn not matching the target host name. Am I correct in this assumption or am I misunderstanding the concept of Subject Alternative Name? Just to avoid conversation, I do not want to have users on mycompany.net addresses use the mycompany.com server because I might (not a technical issue) have to split up into two different locations, and I want to produce an easily migrateable setup.

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• Overheating Toshiba Satellite L300

  - by ldigas

  A coleague of mine's having trouble with his new Toshiba Satellite L300 ... I tool a kook at it, and indeed it's hot as hell. I couldn't hold my hand on it for too long. He says it also has a tendency to turn itself off (WinXP 32bit running) with no forewarning. Hasn't happened to me while I was using it, but that wasn't long anyways. The first guess was it was too dirty ... problem is it's new, came out of a package a quarter of a year ago. Kept in a clean environment (office). Looks clean. No dust in sight. Second guess is that the fan wasn't working properly, cause indeed it has intervals of working, and non working. But when I listen to it, it sounds like normal usage. I took a SpeedFan measurement, and it reports temp. up to 85 Celsius ... which is definitely too high. Anyone knows what else I could do to it ? It is under warranty and it will go to the service, but I thought if there is something we can do, as to avoid carrying it there / be without it for a week ...

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• NGINX server_name issues

  - by Unai

  I have the following simple server block on NGINX: server { listen 80; listen 8090; server_name domain.com; autoindex on; root /home/docroot; location ~ \.php$ { include /usr/local/nginx/conf/fastcgi_params; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /home/docroot$fastcgi_script_name; fastcgi_pass 127.0.0.1:9000; } } After I include the relevant settings on my hosts file I get the following (unexpected) behavior: http: //domain.com/ and http: //domain.com:8090/ work fine; http: //domain.com:8090/future-cell-phone-technology-01-150x150.jpg works; http: //domain.com/future-cell-phone-technology-01-150x150.jpg - ERROR! "The connection was reset" (note.- added a space after http: to avoid link protection but this is not really promoting anything) I've been troubleshooting (3) for a couple hours and I'm unable to identify the culprit. I'm running NGINX 1.0.10 (latest stable) on Debian 6.0.2 32 bits. This NGINX instance runs another 40 or 50 sites with no problems.

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• Maximum limit of filepointer in php reached and not changeable

  - by mlaug

  I have a server with the current 5.3.x version installed. Since we are running a really simple and small server in php using sockets, that connects to a lot clients using sockets we need to raise the open file limit that has been already done on the server for the user, that runs the server #ulimit -a core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 29879 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 8192 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 29879 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited and we compiled php with --enable-fd-setsize=8192 still we are getting [19-Nov-2012 09:24:23 Europe/Berlin] PHP Warning: socket_select(): You MUST recompile PHP with a larger value of FD_SETSIZE. It is set to 1024, but you have descriptors numbered at least as high as 1024. --enable-fd-setsize=2048 is recommended, but you may want to set it to equal the maximum number of open files supported by your system, in order to avoid seeing this error again at a later date. once in a while in our logs. Anyone knows who to configure the unix server and php correctly to have that working? I found a bug, but that is related to 2006 and marked as "not a bug" https://bugs.php.net/bug.php?id=37025&edit=1

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• Is it possible to provide a wired ethernet connection to external devices with an extra LAN card?

  - by Ben McCormack

  I'm trying to provide a wired ethernet connection (wireless is not an option for this device) to a device (Samsung blu-ray player) without running Cat5 cable all over the home. I have a PC sitting next to this device and the PC is connected to the network via a wireless USB adapter. Is it possible to provide a wired connection from the PC to the wired device using the (currently unused) ethernet port in the back of the computer? Here's how I envision the device getting connected to the internet via my network: Linksys WRT54G v8 Wireless Router | ``--> Windows 7 PC connected via wireless | ``--> Blu-ray player connected via wired connection to the ethernet port on the PC. If so, how is this done? Will I need a crossover cable? What settings will I need to change in Windows 7 so that the device can connect? NOTE: I'm trying to avoid having to buy a wireless bridge and/or hacking a router with an open-source firmware to get this to work. See my previous question for more details.

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• Intermittent NFS lockups on Isilon cluster

  - by blackbox222

  We have an Isilon cluster with 8 IQ 12000x nodes which exports storage via several NFS shares for a handful of Linux and Solaris clients. There is a Linux system that has one of these NFS filesystems mounted. I/O to this filesystem is moderately heavy from the Linux system. Every 3-4 weeks (it's not on any kind of discernible schedule, and sometimes is more/less frequent than this), we notice that all activity ceases on this NFS mount (the process hangs, as if the network stopped working so process is stuck in uninterruptible sleep) - 30 minutes later, the share recovers and things continue to work normally. The kernel log from the affected machine is as follows: Dec 3 10:07:29 redacted kernel: [8710020.871993] nfs: server nfs-redacted not responding, still trying Dec 3 10:37:17 redacted kernel: [8711805.966130] nfs: server nfs-redacted OK relevant /etc/fstab line: nfs-redacted:/ifs/nfs/export_data/shared/...redacted... /data nfs defaults 0 0 I've checked to see if there are any scheduled processes e.g. cron jobs, Isilon related functions e.g. snapshots, etc that might be causing these hangups but I can't seem to find anything. I'm also not aware of any network related issues or maintenance that would cause this. All of the lockups last almost exactly 30 minutes per the kernel logs. Perhaps someone has some suggestions I could try? (I considered a soft mount to avoid the problems associated with processes accessing the filesystem hanging; however am wary of the corruption that could result and it would not really solve the underlying issue anyway).

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• Compress a folder of PDF files into separate zip archives

  - by Panrubius

  I wanted to take a folder full of PDF files and create a number of separate zip files, after following the advice on this question everything worked *almost*perfectly. Here's what happened: When I issued this command in Terminal: zip -s 5m -r ~/Desktop/invoices ~/Desktop/Invoices/ Everything worked really well, in that I got 11 ZIP files of approximately 5 MB each; placed in the folder specified. However, the files they outputted were named as follows: invoices.z01 invoices.z02 invoices.z03 invoices.z04 invoices.z05 invoices.z06 invoices.z07 invoices.z08 invoices.z09 invoices.z10 invoices.zip So as you can see only invoices.zip has been named correctly. I could go through and rename them one by one, but seriously, if we start doing that then what in the name of Evolution are computers for?! Now, I am also aware that I'm relatively new to the Terminal; so I could be making a very silly mistake somewhere. If that's the case, please be patient :-) Any help would be greatly appreciated. One last note: I'm quadriplegic so I would like to avoid GUI applications as much as possible, I use voice recognition software you see this working in the Terminal is much much easier.

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• Troubleshoot dropped wireless connections

  - by Jack

  I was recently hired in the IT department of a small company (~180 users) and one of the issues that people have been complaining about is having their wi-fi connections drop during meetings. The company is using an HP ProCurve Wireless LAN with 10 APs and a controller unit located in the server room. I don't have any experience troubleshooting WLAN in a multi-AP environment, so I'm trying to at least gather information using free or cheap tools. I did a basic site survey using the free version of Ekahau HeatMapper and discovered the following in one of the conference rooms that has been a problem. The program picked up three access points (plus a bunch of others with much lower signals that were out of range): AP 1: SSID: "Unknown SSID" - Signal strength: -48 dBm - -40 dBm. Channel: 2 AP 2: SSID "CompanyMain" - Signal strength: -35 dBm or greater. Channel: 2. Security: WEP (This is the main SSID for the company's WLAN.) AP 3: SSID: "CompanyGuest" - Signal strength: -40 dBm - -35 dBm. Channel: 2. Security: WPA2 (This SSID is the company's "guest" WLAN, which was setup to allow Internet access, but prevent network access.) Is there anything that you see that is clearly a problem from the above? I'm assuming that the unknown SSID might be a big problem, and that it is an AP from a neighboring office that is causing interference. Does that seem likely? Also, regarding channel, should we try changing the channels of our APs to avoid interference with that unknown SSID? (Since everything seems to be on Channel 2?) Should our APs be on different channels? In other words, should the CompanyMain and CompanyGuest APs be on different channels? Finally, any recommendations for free/cheap tools to help me figure this out, and/or a good methodology to follow? Thanks in advance for any help. Jack

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• Implications of disabling the AMD Phenom's TLB patch?

  - by DMA57361

  I'm currently running a AMD Phenom X4 9600 processor (yeah, it's aging a bit, but other recent problems mean it's not getting upgraded in the immediate future), which happens to be one of the chips that suffer from the TLB errata. I recall that the first time I played with disabling the TLB patch (probably over a year ago, while playing a game that had a severe performance problem such that it was almost unplayable unless the patch was disabled) I had at least one BSOD, but I can't remeber them being particularly frequent. However, because it decreased instability, I stopped disabling the patch once I was done with the game. Now, after some recent hardware changes I was experiancing much worse performance than expected from the new hardware under some circumstances, and the TLB jumped to mind - after testing I found that disabling the patch would improve the performance to expected levels. I'm now wondering if it's worthwhile always having the patch disabled to avoid any potential slowdowns cropping up in the future, or if it is too dangerous. Everything I read states that the bug, when not patched, can causes a system lock-up in "rare circumstances". So, with the TLB patch disabled: How frequently should system lock-ups be expected? Do we know what the circumstances that trigger the lock-ups are? (Don't worry too much about being highly technical, but essentially I wonder if the chip more vunerable under heavy load, or heavy memory usage, etc?) Are there any secondary problems I should be aware of? (Don't include things that are charateristic to all lock-ups, please)

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• Changing Corosync/Heartbeat pair's active node based on MySQL/Galera cluster state

  - by Hace

  Background I'm planning on building a High Availability "cluster" for our Zabbix instance by placing two physical servers in one server room and two in another server room. In each server room one of the physical servers will run Zabbix on RHEL and the other will run Zabbix's MySQL database, also on RHEL. I'd prefer synchronous replication for the MySQL nodes so I'm planning on using Galera in a master-slave configuration. The Zabbix instances on the two Zabbix servers would be controlled by Heartbeat/Corosync (although Red Hat Cluster Suite is also an option...) If the Zabbix server in Server Room A goes down, the one in Server Room B becomes active (and vice versa). Ditto for the MySQL servers/instances. If either of those cases happen, however, the connection between the Zabbix server and the MySQL server becomes significantly slower as ti has to travel over WAN. Question Is it possible to configure the Heartbeat/CoroSync pair to instruct the MySQL/Galera cluster to change the master node to switch to (if available) the one that's in the server room as the active Heartbeat/Corosync -node and (more challengingly) is it possible to do the same in the other direction, i.e have the Galera cluster change the active Heartbeat/CoroSync server to be in the same room as the active MySQL master server in case of a failover in over to avoid unnecessary WAN transfers between the application and its DB? Theories Most likely I can get CoroSync to run something that'd log in to one of the DB nodes to change the MySQL/Galera master but I don't know if it's really possible to do anything similar in the other direction in Galera. Is it possible to define a "service" in CoroSync/Heartbeat so that both the service and its MySQL service would migrate as one if possible. Using the DB server that's behind WAN should still be a better option to DB downtime. Am I just using too many tools to solve a problem that'd be far simpler with something else?

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• append $myorigin to localpart of 'from', append different domain to localpart of incomplete recipient address

  - by PJ P

  We have been having some trouble getting Postfix to behave in a very specific fashion in which sender and recipient addresses with only a localpart (i.e. no @domain) are handled differently. We have a number of applications that use mailx to send messages. We would like to know the username and hostname of the sending party. For example, if root sends an email from db001.company.local, we would like the email to be addressed from [email protected]. This is accomplished by ensuring $myorigin is set to $myhostname. We also want unqualified recipients to have a different domain appended. For example, if a message is sent to 'dbadmin' it should qualify to '[email protected]'. However, by the nature of Postfix and $myorigin, an unqualified recipient would instead qualify to [email protected]. We do not want to adjust the aliases on all servers to forward appropriately. (in fact, every possible recipient doesn't have an entry in /etc/passwd) All company employees have mailboxes on Exchange, which Postfix eventually routes to, and no local Linux/Unix mailboxes are used or access. We would love to tell our application owners to ensure they use a fully qualified email address for all recipients, but the powers that be dictate that any negligence must be accommodated. If we were to keep $myorigin equal to $myhostname, we could resolve this issue by having an entry such as the following in 'recipient_canonical_maps': @$myorigin @company.com However, unfortunately, we cannot use variables in these map files. We also want to avoid having to manually enter and maintain the actual hostname in 'recipient_canonical_maps' for each server. Perhaps once our servers are 'puppetized' we can dynamically adjust this file, but we're not there yet. After an afternoon of fiddling I've decided to reach out. Any thoughts? Thanks in advance.

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• NAT vs public IP (and blocked ports)

  - by user1646166

  I have a problem with my ISP. They say that they don't block any ports and I have public IP, while I think these both statements are false. Before I talk to them again (which is really tough when my understanding of these terms is different than theirs) I would like to make some things clear. It seems like my computer is behind NAT (is it possible to have public IP and be behind NAT at the same moment?). When I check my IP, through some external server, and type that IP into browser I get a home page of some router (not mine). Isn't that a proof that my IP isn't public? Also, I have problems with making connections via some ports. E.g. when I'm trying to connect through some high port ( 1023) via SSH, it doesn't work. Is it possible that certain range of outgoing ports from my computer are blocked? Or is it simply because that my ssh client (PuTTY) can't receive incoming packets because of blocked incoming ports? To avoid some questions: it's not a problem with my router, I tried connecting my PC directly and it also didn't work, while having connected by 3G using phone with USB tethering, it does work. Thanks!

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