Latest LQ Deal: Complete CCNA, CCNP & Red Hat Certification Training Bundle
Go Back > Forums > Linux Forums > Linux - Networking
User Name
Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.


  Search this Thread
Old 03-27-2008, 11:52 AM   #1
LQ Newbie
Registered: Aug 2006
Posts: 21

Rep: Reputation: 15
Strange networking issue on my linux workstation

I'm going to try to explain this the best I can to see if anyone has had a similar issue or knowledge in this subject. My workstation is running opensuse 10.3 and it sits in our main office. We have a colo site that is connected to our main office with a 50 meg fiber connection. The colo is connected within the same subnet (we don't route to it but bridge it). For example my workstation is and a colo server is and the subnet mask is, so it's basically a supernetted class c. In order for a colo server to communicate with the main office, it goes through 4 switches, 2 at the colo and 2 at the main office. This works fantastically with everything at the colo and the main office...except for my linux workstation. I can't ping or telnet or ssh anything at the colo, but I can hit everything here at the main office. I have my subnet mask right, and I can ping networks beyond the colo (we have some wans connected beyond the colo). Something else interesting is that when I try to ping that server ( I get the right entry into my arp table and when I look at the server at the colo it has the right arp entry in it's arp table as well. And when I look at each of the switches in between the server and my workstation they all have the correct mac address table entries for my workstation. I'm completely confused! Is there something huge I'm overlooking?

Old 03-27-2008, 11:57 AM   #2
LQ Newbie
Registered: Aug 2006
Posts: 21

Original Poster
Rep: Reputation: 15
I almost forgot to mention that I'm running a windows xp vm on my workstation that is using the same network card. I can hit everything at the colo from that vm.
Old 03-27-2008, 11:57 AM   #3
Senior Member
Registered: Mar 2004
Location: Cary, NC, USA
Distribution: Fedora, Kubuntu, RedHat, CentOS, SuSe
Posts: 1,288

Rep: Reputation: 99
What happens if you turn off your firewall and run these tests?

Old 03-27-2008, 02:02 PM   #4
LQ Newbie
Registered: Aug 2006
Posts: 21

Original Poster
Rep: Reputation: 15
Thanks for the reply. I figured it was a rogue management interface with a mis-configured subnet mask on a cisco router that was answering to arp requests. Now communications to the dr site works from my workstation and much faster from the others.


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Strange Networking Issue EclipseAgent SUSE / openSUSE 2 04-28-2006 08:51 PM > Forums > Linux Forums > Linux - Networking

All times are GMT -5. The time now is 07:17 PM.

Main Menu
Write for LQ is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration