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• vyatta Server Reboots by itself

  - by Fernando

  I have an issue regarding some hardware, maybe you can help me. First, I set up a Supermicro Superserver SYS-5016I-NTF with a Intel Xeon X3470 and 4 GB of Ram with a Hotlava Card Tambora 64G4 with Intel Chipset 82599EB and 4x10G SPF+ ports. Installed Vyatta community edition 6.3. I used it as router making BGP connections with 2 operators. No load at all, temp ranges normal. But the issue is that it reboots by itself in a ramdom way. Not very often, once every few days. But it is unacceptable for production purposes. So I try to test on different hardware, and installed Vyatta community edition 6.3 on a Dell PowerEdge 2950, with Xeon(R) E5345 @ 2.33GHz and 4 GB of Ram. Same Vyatta configuration as Supermicro Server. With same hotlava Card model ( I bought two of them ) Well I have reboots with this equipment as well. Same frecuency as above. I have checked syslog no strange logs until boot process starts to be logged. So it seems server reboot suddenly. I have installed latest driver for the chipset of the Hotlava card. Servers are placed in a datacenter with UPS So finally two things in common in both servers: Hotlava Card. Someone with issues with this card, or the chipset?? Could be it this card?? Vyatta 6.3 community edition. I don't thing is the problem. Is a regular Debian with packages to glue together different services. Or maybe is something I am missing. Andy ideas, suggestions?? Thank you very much... Fernando

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• SSH works in putty but not terminal

  - by Ryan Naddy

  When I try to ssh this in a terminal: ssh [email protected] I get the following error: Connection closed by 69.163.227.82 When I use putty, I am able to connect to the server. Why is this happening, and how can I get this to work in a terminal? ssh -v [email protected] OpenSSH_6.0p1 (CentrifyDC build 5.1.0-472) (CentrifyDC build 5.1.0-472), OpenSSL 0.9.8w 23 Apr 2012 debug1: Reading configuration data /etc/centrifydc/ssh/ssh_config debug1: /etc/centrifydc/ssh/ssh_config line 52: Applying options for * debug1: Connecting to sub.domain.com [69.163.227.82] port 22. debug1: Connection established. debug1: identity file /home/ryannaddy/.ssh/id_rsa type -1 debug1: identity file /home/ryannaddy/.ssh/id_rsa-cert type -1 debug1: identity file /home/ryannaddy/.ssh/id_dsa type -1 debug1: identity file /home/ryannaddy/.ssh/id_dsa-cert type -1 debug1: identity file /home/ryannaddy/.ssh/id_ecdsa type -1 debug1: identity file /home/ryannaddy/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5 debug1: match: OpenSSH_5.1p1 Debian-5 pat OpenSSH_5* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.0 debug1: Miscellaneous failure Cannot resolve network address for KDC in requested realm debug1: Miscellaneous failure Cannot resolve network address for KDC in requested realm debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP Connection closed by 69.163.227.82

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• HTTPS and Certification for dummies

  - by Poxy

  I had never used https on a site and now want to try it. I did some research, but not sure that I understood everything. Answers and corrections are greatly appreciated. Here we go: To use https I need to generate ‘private’ and ‘public’ keys for the web server I use. In my case it’s apache (manual: http://httpd.apache.org/docs/2.0/ssl/ssl_faq.html) Https protocol should be bind to port 443. Q: How to do it? Is it done by default? Where can I check configuration? Aplying https. Q: If I see https in browser does it mean that the data traffic on the page IS encrypted? Any form on the page would submit data via https? Though all the data gonna be encrypted, the browsers would still show ugly red messages. This is just because they do not know anything about my certificate. They have about a hundred certificates pre-installed but mine is not one of them, obviously. But the data IS encrypted by https. If I want browsers to recognize my certificate, I would need to have it signed by one of the certification authorities (ca) that has its certificate pre-installed (e.g. thawte, geotrust, rapidssl etc). UPD: To reed about ssl/tsl: The First Few Milliseconds of an HTTPS Connection, I found it very informative. Examples for PHP (openssl.org) of how to make use of ssl/tsl on the server side are published here.

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• What is /etc/apache2/sites-available used for and is it necessary?

  - by Mariane

  I have 3 sites, each with a specific IP, running on apache2 (up-to-date Ubuntu). To put a site online, I just created a file in: /etc/apache2/sites-enabled and in this file I told apache which directory was the root directory for this site, and to which IP it should correspond. So I have 000-default 001-www.lapf.eu 002-www.felkin.info 003-www.seidhr.fr in this directory. My first site, lapf suddenly lost contact with its database after the domain name was transferred from another registrar unto the registrar who is also hosting the site's data. Then I did an update, and I reinstalled mysql-server and mysql-common, and I did I-have-forgotten-what to reinstall the locales (uft8 and such) which had vanished for some reason. This fixed my first site. Now I noticed that the other 2 sites are offline. Pointing a browser to them just hangs until timeout. They used to function, and their domain names did not move, they are still registered at the same place. The files are still in /etc/apache2/sites-enabled I noticed another directory: /etc/apache2/sites-available with just defaut and default.ssl in it. Why are there 2 directories, sites-enabled and sites-available? Should I copy the files from "sites-enabled" into "sites-available"? Or should I put a modified version of each in "sites-available"? command: "apache2ctl -S" VirtualHost configuration: 92.243.20.169:80 Charlotte (/etc/apache2/sites-enabled/001-www.lapf.eu:1) 92.243.21.141:80 xvm-21-141.ghst.net (/etc/apache2/sites-enabled/002-www.felkin.info:1) 92.243.4.114:80 xvm-4-114.ghst.net (/etc/apache2/sites-enabled/003-www.seidhr.fr:1) wildcard NameVirtualHosts and default servers: *:80 is a NameVirtualHost default server Charlotte (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost Charlotte (/etc/apache2/sites-enabled/000-default:1) Syntax OK

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• knife on Windows inconsistently reads ~\.ssh\knife.rb on Management Workstation

  - by gWaldo

  I am implementing a new instance of (Open-source v10.12) Chef in an existing environment. Currently the environment is mostly Windows, but more Linux is being introduced. I have used Chef in a previous gig, however that was a *nix-only environment. Because this is a primarily-Windows environment, my main workstation is Windows 7 (x64), and I use Powershell as my main terminal. I created a ~\.chef directory, populated with a knife.rb and my client.pem file. When I run knife client list from ~, I get the expected results. I keep my work in Dropbox just in case my laptop should fail or be stolen. When I run knife client list from the repo directory (C:\Users\waldo\Dropbox_company\projects\chef`), I get ERROR: Your private key could not be loaded from C:/home/waldo/.chef/waldog.pem Check your configuration file and ensure that your private key is readable (Note that the path is incorrect) This is the progression as I walk up the tree towards my ~ running knife client list: C:\Users\waldo\Dropbox\_company\projects\ => Above error C:\Users\waldo\Dropbox\_company\ => Above error C:\Users\waldo\Dropbox\ => It works! (Expected results) C:\Users\waldo\ => Expected results C:\Users\waldo\Documents\ => Expected Results C:\Users\waldo\Documents\GitHub => Expected Results C:\Users\waldo\Documents\GitHub\aProject\ => Expected Results What. The. Eff! Now, I know that I can add -c path\to\knife.rb, but that's a HUGE PITA. Question is: Why is knife inconsistently reading my ~\.chef\knife.rb, and how can I get around that without incurring carpal tunnel?

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• Sun Grid Engine (SGE) / limiting simultaneous array job sub-tasks

  - by wfaulk

  I am installing a Sun Grid Engine environment and I have a scheduler limit that I can't quite figure out how to implement. My users will create array jobs that have hundreds of sub-tasks. I would like to be able to limit those jobs to only running a set number of tasks at the same time, independent of other jobs. Like I might have one array job that I want to run 20 tasks at a time, and another I want to run 50 tasks at a time, and yet another that I'm fine running without limit. It seems like this ought to be doable, but I can't figure it out. There's a max_aj_instances configuration option, but that appears to apply globally to all array jobs. I can't see any way to use consumable resources, as I'd need a "complex attribute" that is per-job, and that feature doesn't seem to exist. It didn't look like resource quotas would work, but now I'm not so sure of that. It says "A resource quota set defines a maximum resource quota for a particular job request", but it's unclear if an array job's sub-tasks' resource requests will be aggregated for the purposes of the resource quota. I'm going to play with this, but hopefully someone already knows outright.

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• Bridging Wireless and Wired Interfaces in Linux

  - by The Daemons Advocate

  My network setup is something like: Wireless Router <---> Netbook <---> Ubuntu Desktop ...or, more verbosely (with interfaces): Wireless Router <--(wireless)--> (eth2) Ubuntu Netbook Ubuntu Netbook (eth0) <---(wired)----> (eth0) Ubuntu Desktop In a perfect world, I'd have the desktop wired, but weird circumstances combined with my wanting to understand more about networking in linux make me want to figure out how to bridge these two devices. A bit of googling has given me this example using bridge-utils, and here's how I'm (failing) to setup the bridge (on the netbook): sudo -i ifconfig eth0 0.0.0.0 ifconfig eth2 0.0.0.0 brctl addbr bridget brctl addif bridget eth0 brctl addif bridget eth2 ifconfig bridget up ...then, trying to make sure that the netbook can still get on the internets... route add default gateway 192.168.2.1 dhclient bridget What happens after this is that the dhclient command above (netbook) doesn't get served an IP, and the Desktop, if I run dhclient, it doesn't get served an IP. Some weird considerations might be that I'm running the Network Manager Applet that comes with Ubuntu. While I'm sure I can get a command line wireless configuration setup, it's a bit complex. Can someone give me a shout as to where I'm going wrong? I'd also like to note another related question titled 'Bridging my laptop’s wireless and wired adaptors', however the setup is different to mine.

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• Is USB supported in safe mode on XP?

  - by Hugh Allen

  According Microsoft, "Universal Serial Bus Devices Do Not Work in Safe Mode" under XP. However, in my testing this is incorrect. USB keyboards, mice and flash drives seem to work fine in safe mode (I made sure the BIOS was not providing support). This makes sense because a failure of a standard input device would be, in Microsoft parlance, a "bad user experience". So, Is USB supported in safe mode on XP? If your answer is no (agreeing with Microsoft), please provide a test case, preferably in a virtual machine, where a standard HID keyboard or mouse fails. Please state hardware / BIOS / OS configuration. Note that you will need a PS/2 keyboard attached in addition to your USB device(s) in order to use the boot menu. Virtual machine software usually emulates a PS/2 keyboard. Alternatively, you could add the /safeboot switch to boot.ini. If your answer is yes, please provide a link to some supporting documentation (either from Microsoft or someone authoritative). Your answer might be "devices X, Y and Z are supported but nothing else", in which case also give a link.

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• Kickstart: Serve dynamic kickstart images via a CGI or PHP script?

  - by Stefan Lasiewski

  I'd like to kickstart a couple dozen RHEL6/SL6 servers. However, some of these servers are different and I don't want to create a new ks.cfg file for each class of server. Are there any products which can generate a Kickstart file dynamically on the fly, from a template? For example, if I append a line like this to the KERNEL: APPEND ks=http://192.168.1.100/cgi-bin/ks.cgi Then the script ks.cgi can determine what host this is (Via the MAC address), and print out Kickstart options which are appropriate for that host. I could optionally override some options by passing parameters to the script, like this: APPEND ks=http://192.168.1.100/cgi-bin/ks.cgi?NODETYPE=production&IP=192.168.2.80 After we kickstart the server, we activate Cfengine/Puppet on this system and manage the system using our favorite Configuration Management product. We're experimenting with xCAT but it is proving too cumbersome. I've looked into Cobbler, but I'm not sure it does this. Update: A roll-your-own solution is discussed in the O'Reilly book: Managing RPM-Based Systems with Kickstart and Yum, Chapter 3. Customizing Your Kickstart Install Dynamic ks.cfg, which echos some of the comments in this thread: To implement such a tool is beyond the scope of this Short Cut, but I can walk through the high-level design. Any such solution would mix a data store (the things that change) with a templating solution (the things that don’t change). The data store would hold the per-machine data, such as the IP address and hostname. You would also need a unique identifier, perhaps the hostname, such that you could pick up a given machine’s data. The data store could be a flat file, XML data, or a relational database such as PostgreSQL or MySQL. In turn, to invoke the system, you pass a machine’s unique identifier as a URL parameter. For example: boot: linux ks=http://your.kickstart.server/gen_config?host-server25 In this example, the CGI (or servlet, or whatever) generates a ks.cfg for the machine server25. But where, oh where, is the code for ks.cgi?

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• Display maintenance site to requesters based on their IP address

  - by user64294

  Hi all. I would like to set a special configuration in our apache web server. I would like to display sites to the users according to their IP addresses. We plan to upgrade our web sites. During the upgrade we'll put a maintenance site: so all the users which will connect to our web sites will get this site. There are 200 websites affected by the upgrade, so I don't want to change apache settings for each one. In order to test the upgrade i need to set apache to let only my IP address to access to asked site. If my IP address is a.b.c.d and if i ask for test.com i want to see it. but all other users, having a different IP address, should get the maintenane site even if they look for test.com. Our webserver is hosted out of the office (ovh.com france). The testers are the developers at our office and me. We can take some sites and enable them for test in which we implement IP restrictions in each website: the idea is on these websites, if the visitor's IP address is different from our office IP address we redirect this visitor to our maintenance website else we display the website. Is there a way to do this? Thank you.

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• How to prioritize openvpn traffic?

  - by aditsu

  I have an openvpn server, with one network interface. VPN traffic is extremely slow. I tried to do traffic control with this configuration (currently): qdisc del dev eth0 root qdisc add dev eth0 root handle 1: htb default 12 class add dev eth0 parent 1: classid 1:1 htb rate 900mbit #vpn class add dev eth0 parent 1:1 classid 1:10 htb rate 1500kbit ceil 3000kbit prio 1 #local net class add dev eth0 parent 1:1 classid 1:11 htb rate 10mbit ceil 900mbit prio 2 #other class add dev eth0 parent 1:1 classid 1:12 htb rate 500kbit ceil 1000kbit prio 2 filter add dev eth0 protocol ip parent 1:0 prio 1 u32 match ip sport 1194 0xffff flowid 1:10 filter add dev eth0 protocol ip parent 1:0 prio 2 u32 match ip dst 192.168.10.0/24 flowid 1:11 qdisc add dev eth0 parent 1:10 handle 10: sfq perturb 10 qdisc add dev eth0 parent 1:11 handle 11: sfq perturb 10 qdisc add dev eth0 parent 1:12 handle 12: sfq perturb 10 But it's still extremely slow. I have an imaps connection that keeps transferring data continuously (I successfully limited the rate) but with openvpn I can't seem to get more than about 100kbit/s The internet connection speed is about 3mbit/s (symmetric) What could be the problem? Does the sport filter work for udp?

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• GNU Screen and Finch Not Playing Nicely

  - by Sean M

  I use finch for instant messaging, and for persistence, finch is one of the things that runs in my screen session. There are three main computers that I access my screen session from, and each works at a different screen resolution. Because of the different resolutions, when I switch computers, I use screen -rd to attach to my screen session. Using screen -x results in problems. When I attach to the session, though, finch experiences display problems. I have to wait up to several minutes for finch to become responsive - it doesn't redraw properly at all. Trying to switch between chats just writes ^n and ^p, or ^(1-9) for numbers. It fixes itself after some time. Using ctrl-l does not help. Switching back and forth between screen windows does not help. This is an annoying behavior that I don't experience with any other applications running in screen. Is this a bug in screen or finch, and if not, what can I change about my configuration to correct it ? (would appreciate it if "finch" could be used as a tag for this instead of or in addition to "pidgin")

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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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• How to convert an MKV to AVI with minimal loss

  - by Linux Jedi

  To convert an MKV to AVI, I do two things. The first thing I do is this: ffmpeg -i filename.mkv -vcodec copy -acodec copy output.avi This converts the MKV to an AVI, but the problem is that the video does not play smoothly for some reason. That's fine, because if I do one more thing it gets fixed: ffmpeg -i output.avi -vcodec mpeg4 -b 4000k -acodec mp2 -ab 320k converted.avi After I do this then the file plays without problem. I had success doing it this way for one file, but then I tried it on another file, and there is a slight, but noticeable loss in video quality. This is the output I get when doing the second step: FFmpeg version 0.6.1, Copyright (c) 2000-2010 the FFmpeg developers built on Dec 29 2010 18:02:10 with gcc 4.2.1 (Apple Inc. build 5664) configuration: libavutil 50.15. 1 / 50.15. 1 libavcodec 52.72. 2 / 52.72. 2 libavformat 52.64. 2 / 52.64. 2 libavdevice 52. 2. 0 / 52. 2. 0 libswscale 0.11. 0 / 0.11. 0 Seems stream 0 codec frame rate differs from container frame rate: 359.00 (359/1) -> 29.92 (359/12) Input #0, avi, from 'output.avi': Metadata: ISFT : Lavf52.64.2 Duration: 00:04:17.21, start: 0.000000, bitrate: 3074 kb/s Stream #0.0: Video: mpeg4, yuv420p, 704x480 [PAR 229:189 DAR 5038:2835], 29.92 fps, 29.92 tbr, 29.92 tbn, 359 tbc Stream #0.1: Audio: vorbis, 48000 Hz, stereo, s16 Output #0, avi, to 'nidome_no_kanojo.avi': Metadata: ISFT : Lavf52.64.2 Stream #0.0: Video: mpeg4, yuv420p, 704x480 [PAR 229:189 DAR 5038:2835], q=2-31, 4000 kb/s, 29.92 tbn, 29.92 tbc Stream #0.1: Audio: mp2, 48000 Hz, stereo, s16, 320 kb/s Stream mapping: Stream #0.0 -> #0.0 Stream #0.1 -> #0.1 I just used arbitrarily large settings on the second step and it worked nicely before but not in this case. What settings should I use?

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• Supervisord doesn't stop nginx process

  - by Lennart Regebro

  I'm using Supervisor a lot, and in this project I have an nginx process managed by Supervisord. The relevant parts of the configuration is this: [supervisord] logfile=/home/projects/eceee-web/prod/var/log/supervisord.log logfile_maxbytes=5MB logfile_backups=10 loglevel=info pidfile=/home/projects/eceee-web/prod/var/supervisord.pid ; childlogdir=/home/projects/eceee-web/prod/var/log nodaemon=false ; (start in foreground if true;default false) minfds=1024 ; (min. avail startup file descriptors;default 1024) minprocs=200 ; (min. avail process descriptors;default 200) directory=/home/projects/eceee-web/prod [program:nginx] command = /home/projects/eceee-web/prod/bin/nginx redirect_stderr = true autostart= true autorestart = true directory = /home/projects/eceee-web/prod stdout_logfile = /home/projects/eceee-web/prod/var/log/nginx-stdout.log stderr_logfile = /home/projects/eceee-web/prod/var/log/nginx-stderr.log The /home/projects/eceee-web/prod/bin/nginx command will start nginx in the foreground, it does not deamonify itself. Still, stopping it will fail: supervisorctl stop nginx Will not give any answer, but the process will continue. Any idea what? This is on OS X Darwin, with Supervisor 3.0a9 and nginx 0.7.65.

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• Would an invalid certificate cause an 0x8004010F sync error?

  - by hydroparadise

  We just migrated from Exchange 2003 to 2007 which was a combo primary AD/DNS server and it has not gone smoothly. We are now down to getting a new certificate (a bureaucratic process thats out of my hands) and users getting the 0x8004010F sync issue. We are only using Outlook 2007 as our email client and the sync error appears exactly as so: 9:21:44 Synchronizer Version 12.0.6562 9:21:44 Synchronizing Mailbox '<User>' 9:21:44 Done 9:21:44 Microsoft Exchange offline address book 9:21:44 0X8004010F Now, I have read a number of technet articles on this issue anywhere from adding an A record in the DNS for autodiscover.domain.com to syncing the old OAD to the new OAD. In otherwords, theres lots of thing to try, but trial and error at this point might be hazardous to ther server's health and I am trying to narrow down the list of things to try. What has me thinking that the sync error could be related to the certificate is an event error message that says the following: Microsoft Exchange could not find a certificate that contains the domain name mail.ccufl.org in the personal store on the local computer. Therefore, it is unable to support the STARTTLS SMTP verb for the connector Internet Mail with a FQDN parameter of mail.ccufl.org. If the connector's FQDN is not specified, the computer's FQDN is used. Verify the connector configuration and the installed certificates to make sure that there is a certificate with a domain name for that FQDN. If this certificate exists, run Enable-ExchangeCertificate -Services SMTP to make sure that the Microsoft Exchange Transport service has access to the certificate key. I am not fully clear on how the Exchange Transport Service is related to Syncronization, but my hunch is that it probably not related to there not being a valid certificate. So to recap, would an invalid certificate cause an 0x8004010F sync error?

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• Uploading file > 1 MB on Django admin gives 400 Bad Request response.

  - by ayaz

  I have a small Django (1.2.x) project deployed on Apache (2.x) via mod_wsgi (2.x). In the admin, if I upload a file < 1MB, I can get it through; however, for a file, say, 1.2MB in size, I get a 400 response from the server with "Error 400" in the body only. I am wondering why this is happening. As far as I can see, there is no LimitRequestBody set in Apache configuration. I have tried uploading with several browsers including: Firefox, Chrome, and Safari. In the log file for Apache, there is apparently no entry for requests that gave the 400 error response. This is strange. I should point out that the scenario where this is happening is thus: The project in question is deployed on two identical Apache servers (completely identical setup) that are behind a load balancer. On my development setup, of course, the problem does not surface. Any help with this will be very much appreciated.

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• Desktop PC does not power up on power button

  - by hIpPy

  When I press the power button on my desktop, it does not power up completely. Before I press the power button, I see lights on the motherboard. Everything is normal. On power button press, the fans on the cpu, graphics card and motherboard start to spin a little for a second or two and then they stop. No beeps during this process. It has been doing this for a while now but it used to start up after some trials. Once it starts up, I have NO issues at all like random shutdowns so it is not an issue with OS. I'm just guessing here but it seems as if the PSU (Antec TP2-550ATX) is dying out and does not have enough power now - just a guess. It's an old desktop assembled in 2005 but I have maintained it well. Any ideas? Please help. Thanks. Below is the complete configuration. DFI LAN-Party UT NF4 Ultra-D 6/23 {6.70}, Evercool EC-VC-RE 41/47C, AMD Opteron 170 2.0GHz {1.3.2.16} 1.312V 36/41C, ThermalRight SI-120, Panaflo 120×38mm OCZ Platinum 2×1GB 200MHz 2.66V 3-3-2-7 1T XFX 7800GTX 256MB 475/1250MHz {91.31}, Zalman VF900 Cu led 41/56C WD Caviar 320GB 7200RPM 16MB SATA 3Gb/s Antec TP2-550ATX Antec P180 WinXP sp2 KB896256 Logitech MX310 Razer Mantis Speed BenQ FP91G+ 19" LCD 8ms DVI Creative Audigy2 ZS {4.42} BenQ DW1640 Logitech z-5300e 5.1 280W Legend: Driver versions: {} User settings: [] Voltage: V Wattage: W Temperature: C (Celsius) min/max

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• PC won't PXE boot to WDS/MDT with Dell Optiplex 755

  - by Moman10

  I am trying to set up a basic MDT solution. I have set one up in the past at a previous job and it worked flawlessly, however here I'm running into a problem and am having no luck getting around it. I've installed Windows Server 2012 and MDT 2013, along with adding on the WDS role. I haven't configured much outside of the defaults for WDS, basically just set PXE response to respond to all clients (and unchecked admin approval). This machine does not run a DHCP server. I looked on the DHCP scope of our DHCP server, it shows options 66/67 checked and the server name of the WDS server is in there as well. I didn't add this but I assume it was put on during the install process (I believe I had to manually make some adjustments at my old job for this). The PC I have is a Dell Optiplex 755. I have enabled the onbard NIC w/PXE boot option in BIOS and attempted to boot. I get a "TFTP...." error but nothing offering out a DHCP address like I'm used to. In my previous job it pretty much worked right out of the box. I've verified that PortFast is enabled on the port and I've tried a couple different PCs (but both are the same model, only model I have to work with). No matter what, I get the same error. The subnet the PC is in is a different subnet than where the WDS server is sitting, but there are IP helper statements on the switch and the PCs can get regular DHCP addresses just fine from the DHCP server, just doesn't seem to get offered out a PXE boot option. I don't know if the problem is a configuration with the server or the PC itself...but after a few days of Googling I'm running out of ideas. Does anyone have a good idea of something it may be?

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• Sending mail through local MTA while domain MX records point to Google Apps

  - by Assaf

  My domain's email is managed by Google Apps, so that domain users get Gmail and Calendar, etc. But I also want to be able to send applicative notifications to users outside the domain via email (e.g. "some commented on your post", and so on). However, if I try to send email through code I get blocked by Gmail after a few emails. I send marketing email through MailChimp, to minimize the risk of appearing as spam to my users (one-click unsubscribe, etc.). But I can't send applicative message in this way. I want to install a local MTA (my server runs Ubuntu), but I'm not sure what anti-spam measures I need to implement so that receiving MTAs don't think it's a spam server. What's stopping anyone from setting up a mail server and sending emails using my domain name? AFAIK it's the DNS records that show the MTA's address actually belongs to the domain. But my understanding of this is rather superficial, so someone please correct me if I'm wrong. But what sort of DNS configuration do I need to put in place so that I don't get blacklisted (assuming I don't actually spam anyone)? The MX records already point to Google, and I'd like to keep it this way. So do I just need to define an A record for my internal mail server? Should it show email as coming from a sub-domain, so as not to conflict with the bare domain being managed by google? Edit: Does the following SPF record make sense if I want email from my domain name to be sent by either google's servers or any server with a dns name ending with mydomain.com? "v=spf1 ptr mx:google.com mx:googlemail.com ~all" How should I set up reverse DNS for my server? If I have an A record that points mailsender.mydomain.com to my MTA's ip address, does it mean that reverse lookup will only allow emails sent from [email protected]?

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• How to configure networking on an appliance such that it can plug and play on any corporate network?

  - by Joshua Lim

  I had a chance to configure a Moxa NPort device server appliance on my client's network, it was very easy to do so, done in just 2 minutes. Here's what I did:- The Moxa device server had a preset IP address of 192.168.127.254 and subnet mask 255.255.255.0 - http://www.moxa.com/doc/manual/nport/5400/NPort_5400_Series_Users_Manual_v4.pdf Moxa provides a Windows software which I used to "scan" for the device server. It worked like magic! The software returns a list of device servers found. Each device server is identified by MAC address, and by selecting the device server using the software, I can reset the default IP address and subnet mask of that device server! In comparison, during an earlier project, I spent 2 hours trying to get KVM to work for a Windows 7 embedded appliance I'm trying to install in my client's network - http://superuser.com/questions/380305/how-to-configure-windows-7-professional-appliance-pc-on-my-clients-network-usin Prior to that, I have already tried pre-configuring the IP address and subnet mask to the one which my client provided, yet the appliance still can't connect to the client's network! I've also tried cross cable, didn't work either. After KVM worked, I discovered that the network settings were "lost" after I plug the machine into the client's network. Now my question is what can I do to setup my Windows 7 embedded appliance so that it can connect to any network like that the Moxa device server? I tried experimenting this on my network using a Windows machine configured to an IP address of 192.168.127.254 and subnet mask 255.255.255.0, but it doesn't connect to my network that uses 192.168.0.*. :( EDIT: I would like to point out that the Moxa Windows configuration software seems to be able to connect to any Moxa device connected to the network even if it is on a different subnet, as long as the network adapter shows "connected". This is important because the Moxa device has no VGSM port or interface to configure the IP address.

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• Printing on Windows 8 with PDF viewer (Adobe Reader) from network

  - by Bongo

  i have a problem with the Adobe Reader 8, but the problem seems to be equally bad with other pdf viewers. Here is the configuration: My PDF viewer is located on network drive "Z:" which is the network adress \dgs-main\progs. I tried to start the adobe reader from here - \\dgs-main\progs\Adobe\Reader 8.0\Reader\AcroRd32.exe and open the PDF from here - C:\Users\ServiceDesk\AppData\Local\Temp\GeneratedPDF.pdf The problem is as follows, if i open the PDF with a local PDF viewer everything works fine and i can print the document. If i open the PDF with the Network PDF viewer then it opens, but printing is impossible. The error message states: "Unable to start print job. Is printer available?" As mentioned above, it works with a local pdf viewer. In both cases i use the same printer. The Printer is a network printer but even with a local printer it fails. The error occurs only on Windows 8 machines. On windows 7 it works fine. I Hope somebody can tell me what the problem is. Thanks in advance and have a fine day.

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• mod_rpaf with apache error_log

  - by Camden S.

  I'm using mod-rpaf with Apache 2.4 and it's working properly (showing the real client IP's) in my Apache access_log... but not in my error_log. My error log just shows the client IP address of the proxy server (my load balancer in this case) Here's an example of what I see in my error_log where 123.123.123.123 is the IP of my load balancer/proxy. == /usr/local/apache2/logs/error_log <== [Tue Jun 05 20:24:31.027525 2012] [access_compat:error] [pid 9145:tid 140485731845888] [client 123.123.123.123:20396] AH01797: client denied by server configuration: /wwwroot/private/secret.pdf The exact same request produces the following in my access_log where 456.456.456.456 is a real client IP (not the IP of the load balancer). 456.456.456.456 - - [05/Jun/2012:20:24:31 +0000] "GET /wwwroot/private/secret.pdf HTTP/1.1" 403 228 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:12.0) Gecko/20100101 Firefox/12.0" Here's my httpd.conf entry: # RPAF LoadModule rpaf_module modules/mod_rpaf-2.0.so RPAFenable On RPAFproxy_ips 127.0.0.1 123.123.123.123 RPAFsethostname On RPAFheader X-Forwarded-For What do I need to do to get the real IP addresses showing in my Apache error_log?

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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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• Multiple WAN interfaces on SonicWall TZ 100?

  - by Chad Decker

  I'm using a SonicWall TZ 100 with a basic configuration of X0 for the LAN and X1 for the WAN. The WAN uses DHCP to obtain its routable IP address. I want to obtain a second routable IP from my ISP. I'm in luck because my cable company will provide me with an additional dynamic IP for $5/mo. How do I bind this IP to my SonicWall? My additional dynamic IP will not be consecutive to the original one. It won't even be on the same class C. I think what I want to do is to use one of the empty ports/interfaces (X2, X3, or X4), tell that interface to use DHCP, and then add that interface to the WAN "zone". I can't figure out how to do this though. Here's what I've tried so far: (1) I've looked in Network Interfaces. I see X0 and X1 but the other unused interfaces don't show up. I don't see an "Add" button to add the new interfaces. (2) I've looked in Network Zones. I see that X0, X2, X3, X4 are in the LAN zone. I tried to drag X3 into the WAN zone but I can't. Nor does clicking the "Configure" button allow me to move an unused interface from LAN to WAN. (3) I've read the post entitled Splitting up multiple WAN's on Sonicwall. This doesn't seem applicable to me. Any thoughts?

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