Discuss October 2009

discuss@lists.centos.org

338 participants
324 discussions

Build a Firewall (Can I learn to do this...)
by ML 05 Oct '09

05 Oct '09

Hi All, I have a home business circuit and I am gearing up to host my business affairs in my place. I have Comcast and 13 static IP's. I have an extra PIII 1U, 2 9gb SCSI, 1gb RAMm dual NICS. So I am wanting to build a firewall to front end my traffic. Assign one of my statics to it and have Comcast statically route my traffic to this IP. Then when traffic comes have it decide if it is allowed or not and if allowed pass it to the right server based upon the rules. I used to work with PIX 525's so I have knowledge, I just dont quite know how to do this with CentOS and such. Can anyone offer advice? Best, -Jason

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Slightly OT: Vim command (or macro) to replace space under cursor by "  " (without deleting the following word)
by Niki Kovacs 05 Oct '09

05 Oct '09

Hi, I'm using Vim to edit some static XHTML pages. I have to (manually) check for non-breakable spaces in my text, and eventually replace simple spaces by the following character sequence:   Usually, when I perform the same operation over and over in a text, I do it once, and then repeat it in command mode using [.]. But I can't figure out how to do this here. Here's what the according macro would look like. Pressing F2 would replace the space under the cursor by " " : :map <F2> cw <ESC> ... except this also deletes the word after the cursor, which is annoying. Any suggestions ? Cheers, Niki

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test
by Janez Kosmrlj 05 Oct '09

05 Oct '09

testing mail delivery

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[Slightly OT] Data Preservation
by ML 05 Oct '09

05 Oct '09

HI All, So I have 5 1U servers (running Windows) that have Ultra 320 SCSI Drives in them. The owner of these boxes wants the drives captured in their current states to .iso or .cdr or something where if the need arises the data can be viewed, used again, etc. So what is the best approach? Boot from a Live CD, hook up a USB external HD and do what? Can I create a .iso or .cdr (or some other portable format) and have it created on the external USB? Thoughts on this process would be appreciated. -ML

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Can't get forwarding to work
by Neil Aggarwal 05 Oct '09

05 Oct '09

Hello all: I am having trouble getting port forwarding with iptables to work. I have this configuration: Internet --- Linux machine --- Windows machine The windows machine is set up to listen on IP address 10.0.0.31 I am able to use lynx to connect to http://10.0.0.31 on the linux machine so there is no problem going from the linux machine to the windows machine. I have tied a public IP address a.b.c.d to the linux machine and entered these rules in its firewall: /sbin/ifconfig eth0:1 $WIN_EXTERNAL_IP netmask $ETH0_NETMASK broadcast $ETH0_BCAST /sbin/iptables -t nat -A PREROUTING -p tcp -i eth0 -d $WIN_EXTERNAL_IP --dport 80 -j DNAT --to $WIN_INTERNAL_IP:80 /sbin/iptables -A FORWARD -p tcp -i eth0 -d $WIN_INTERNAL_IP --dport 80 -j ACCEPT I have this log entry at the bottom of the firewall rules: /sbin/iptables -A FORWARD -j LOG --log-prefix "FORWARD " When I try to go to the external IP address http://a.b.c.d from another network, I get an error. Any ideas? Thanks, Neil -- Neil Aggarwal, (281)846-8957, www.JAMMConsulting.com Will your e-commerce site go offline if you have a DB server failure, fiber cut, flood, fire, or other disaster? If so, ask about our geographically redundant database system.

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problem with installing centos 5.3 on sata ahci
by Maciej Jan Broniarz 04 Oct '09

04 Oct '09

Hello, I am trying to install Centos on sata ahci. The installer first waits few minutes while loading ahci module. Then, the installer cannot detect any disk during the partitioning phase. What might be the problem? I have switched to IDE in bios and it still is the same. Best regards, mjb

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Testing and using a microphone
by Niki Kovacs 04 Oct '09

04 Oct '09

Hi, What's the most simple way to check if my microphone works on a plain CentOS 5.3 desktop? Is there a simple way, for example, to record voice into a simple .wav file? Niki

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NFS lockups
by Mike Yates 04 Oct '09

04 Oct '09

I thought this had been fixed with newer kernels? We have an old Maxtor Snap Server, an 80 GB NAS unit, containing some of our archives. Both of our CentOS servers have it permanently mounted by NFS for convenient access. This weekend, I discovered remotely that, although all systems except the VRTSralus remote agents for Veritas (now Symantec) Backup Exec were working just fine, both servers would freeze a shell solid on starting to run "lsof" or half way through a "df". However, "mount" ran OK and showed the next item in the "df" should have been the Snap Server NFS mount. I pinged it and it did not respond - I'll let you know Monday what is up. "umount -f" showed "Device busy" but "umount -l" worked just fine and "df" "lsof" and "VRTSralus" all work OK now. BTW the Veritas does not access the Snap Server, though the weekly cron-job to tar-ball the Snap Server at 02:00 Saturday did not email me at all, though it is shown in /var/log/cron. Does anyone know of a method to make NFS mounts auto un-mount if the remote server disappears? Mike Yates MBCS CITP (ISSG) IT Support Engineer Hawkgrove Ltd - Software Systems Design 2, The Business Courtyard, Marl Pits Lane, Trudoxhill, Frome, Somerset, BA11 5DL, UK +44 (0)1373 837900 fax: +44 (0)8700 518155 Registered in England: 2756481 VAT Reg: UK 601 1137 11 Registered Office: NSO Associates LLP, 75 Springfield Road, Chelmsford, Essex CM2 6JB All e-mail is subject to contract and is not intended to create a legally binding agreement. Hawkgrove Ltd will only be bound by an agreement in writing signed by an authorized signatory. All outgoing email is scanned by Kerio, using ClamAV 0.94.2/9865/Sat Oct 3 03:45:19 2009 Known viruses: 625330.

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Monitoring OpenVPN TUNs with MRTG
by Eduardo Grosclaude 04 Oct '09

04 Oct '09

I want to check some client OpenVPN TUN interfaces with MRTG running at my VPN server, so I have to specify their OID interface numbers in mrtg.cfg. The problem is, these numbers are dynamic, as they may change whenever OpenVPN restarts for any reason... so, how can I write stanzas such as Target[somehostvpninterface] : ifInOctets.X&ifOutOctets.X:public@ <SOMEHOST.IP> without wiring up the X interface number into cfg file? Or, is there any method to keep X from changing at the clients? Any hints appreciated! -- Eduardo Grosclaude Universidad Nacional del Comahue Neuquen, Argentina

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[Slightly OT] Data Preservation - More
by ML 03 Oct '09

03 Oct '09

Hi All, As it turns out these boxes are Red Hat Enterprise Linux and not Windows!. I am not sure how the person who asked me to do the work does not know what he had! I guess he was the CEO though! So I think this process becomes simpler. I should just be able to insert the live cd and do a cp -r on / to the destination USB drive, correct? -ML

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Discuss October 2009