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OT : iptables/arptables question
by Fabian Arrotin 27 Jan '09

27 Jan '09

I have a CentOS box that acts as a packet filter/firewall with iptables but the box itself isn't able to reach internet : here why : Internet ----- public IP|ISP router|private IP ----- private IP + public IP/32 + public IP subnet/29|my CentOS fw|private network/dmz As you can see my provider gave us a /29 public ip subnet but behind a private IP subnet (192.168.X.X/24 - used for the routing between the ISP router and the fw) I've configured my iptables/routing correctly and machines from the DMZ have no problems reaching the external world (use of SNAT in the nat table of course). The problem is that the firewall itself can't access the public network because of his private ip 192.168.X.X used for the routing between ISP router and itself. I also received a /32 public ip for the fw itself and i've added to the ethx:1 alias . Problem is that kernel always decide that (because of default gw being on the private ip 192.168.X.X) he has to use the 192.168.X.X ip address as outbond interface. So every packet leaving (so i'm talking about OUTPUT table and not about FORWARD nor nat table) the fw comes from a 192.168.X.X ip and so never comes back (which is normal). Question is : how can i "mangle" output packets to appear coming from public ip and not from 192.168.X.X ? For example , at the application layer, i can produce icmp packets with `ping -I my.public.ip/32 remote.host.on.internet` that come back but of course nothing with a traditionnal `ping remote.host.on.internet` I've had a look at arptables and tested ` arptables -A OUT -s 192.168.X.X ! -d 192.168.X.0/24 -o eth3 -j mangle --mangle-ip-s my.public.ip` but that doesn't seem to do the trick .. Any ideas ? I just hope that it was clear enough :-p -- Fabian Arrotin idea=`grep -i clue /dev/brain` ; test -z "$idea" && echo "sorry, init 6 in progress" || sh ./answer.sh

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network question
by ann kok 27 Jan '09

27 Jan '09

Hi How can I clear the arp cache? and ls it possible to setup 2 gateways in centos Thank you for your help

4 3

possible CentOS 5.2 yum RPM checksum issue upstream?
by Justin M. Hunter 27 Jan '09

27 Jan '09

hey guys.. I'm continually seeing the following error although I've got the latest/greatest yum RPM from various CentOS 5.2 repos (mirrors.kernel.org most recently). is there possibly something wrong with the RPM's checksum somewhere upstream? note: I've already regenerated our own mrepo server various times and refreshed the metadata on my yum clients as well. ******* ~# yum clean all; yum update ... Transaction Summary ============================================================================= Install 2 Package(s) Update 57 Package(s) Remove 0 Package(s) Total download size: 97 M Is this ok [y/N]: y Downloading Packages: (1/2): yum-3.2.8-9.el5.ce 100% |=========================| 582 kB 00:00 http://oak-ss-admin001.sixapart.net/mrepo/centos5.2-x86_64/RPMS.updates/yum…: [Errno -1] Package does not match intended download Trying other mirror. (2/2): yum-fastestmirror- 100% |=========================| 13 kB 00:00 ~# md5sum /var/tmp/yum-3.2.8-9.el5.centos.2.1.noarch.rpm d776014eb266b87299465cb38e0f6b96 /var/tmp/yum-3.2.8-9.el5.centos.2.1.noarch.rpm ******* tia! Justin

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How to add network driver for network installation
by MOKRANI Rachid 27 Jan '09

27 Jan '09

Hi, Is someone has an experience for adding a network driver when starting a network installation. My network internal card is : Intel 82567M Gigabit (laptop HP 8530w) This card is not recognized by my system : CentOS 5.2 x86_64 (kernel 2.6.9-92) How to add correctly this driver for a network installation ? I can add the Intel driver e1000e-0.5.11.2 after the installation and the network card works fine, but I need to do network installation, and this card need to be recognized before starting. Any help will be very appreciated. Best Regards. __________________________ Ce message (et toutes ses pièces jointes éventuelles) est confidentiel et établi à l'intention exclusive de ses destinataires. Toute utilisation de ce message non conforme à sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'IFP décline toute responsabilité au titre de ce message. This message and any attachments (the message) are confidential and intended solely for the addressees. Any unauthorised use or dissemination is prohibited. IFP should not be liable for this message. Visitez notre site Web / Visit our web site : http://www.ifp.fr __________________________

5 7

postfix startup issue - CentOS 5.2
by Tom Brown 27 Jan '09

27 Jan '09

Hi I am trying to get postfix going on a friends VPS however after installing on startup i see this Jan 27 11:15:13 postfix/postfix-script: starting the Postfix mail system Jan 27 11:15:13 postfix/master[28090]: fatal: pipe: Cannot allocate memory and a top gives Tasks: 23 total, 1 running, 22 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 524288k total, 160920k used, 363368k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached any clue? thanks # uname -i Linux 2.6.18-028stab059.6 #1 SMP Fri Nov 14 14:01:22 MSK 2008 i686 i686 i386 GNU/Linux # cat /etc/redhat-release CentOS release 5.2 (Final)

5 5

Upgrade to 5.3?
by James Bensley 27 Jan '09

27 Jan '09

Hey Listee's! I'm not that up on CentOS so I'd be curious to know if it is possible to upgrade CentOS 5.2 to 5.3 without reinstalling? Perhaps via Yum? Or can you get update RPMs? I hope this doesn't pose to much of a stupid question. Thanks for your help everyone. Regards, James ;) -----BEGIN GEEK CODE BLOCK----- Version: 3.1 GIT/MU/U dpu s: a--> C++>$ U+> L++> B-> P+> E?> W+++>$ N K W++ O M++>$ V- PS+++ PE++ Y+ PGP t 5 X+ R- tv+ b+> DI D+++ G+ e(+++++) h--(++) r++ z++ ------END GEEK CODE BLOCK------

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Old Small Box
by Mike -- EMAIL IGNORED 27 Jan '09

27 Jan '09

I have an old 400mHz Dell with a 20G hard drive and 125M ram. Can I install and run CentOS on it? Thanks, Mike.

20 28

Bezerk they will go!
by drew einhorn 27 Jan '09

27 Jan '09

On Thu, Jan 22, 2009 at 4:41 PM, Ralph Angenendt <ra+centos(a)br-online.de<ra%2Bcentos(a)br-online.de> > wrote: > Michael St. Laurent wrote: > > > > Is there a projected release date for CentOS-5.3? > > > > > > > > > > > he....did....not....ask...this.... > > > > > > search the forums..when it's done..unless you would like to help..:) > > > > I have helped by sending money. I don't know if that counts or not > > though. > > Sure does and thank you for that. But just as you don't mention the > Reinemachefrau in front of the Nazi chief in "Dead men don't wear plaid", > you > don't ask when the next release comes out here. Someone might go berzerk. > Bezerk they will go, because for each person who doesn't ask, there will be dozens who do. Betcha one of you can make this rhyme, I can't. Note the minimalist .sig Probably should fatten it up -- Drew Einhorn

2 1

Newbie
by kmadananteshwar.vbhat＠gmail.com 27 Jan '09

27 Jan '09

Hi I'm a linux newbie who has just switched from windows and I'd like to know weather or not there is a decent switching guide Sent from BlackBerry® on Airtel

2 1

print from emacs?
by Paul Johnson 26 Jan '09

26 Jan '09

I just noticed this problem in Centos 5.2. WHile editing a file in Emacs, one can print with the Postscript Print option from the pull down menu. However, the ordinary "print" option from the pull down menu, and the "printer icon" in the toolbar, cause nothing to happen. This is a new feature/bug for me. Can you explain? pj -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas

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