LinuxQuestions.org
LinuxAnswers - the LQ Linux tutorial section.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Networking
User Name
Password
Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.

Notices

Reply
 
Search this Thread
Old 05-31-2007, 09:40 AM   #1
vesperatus
Member
 
Registered: Feb 2004
Posts: 44

Rep: Reputation: 15
NIC dropping inbound traffic after some time - CentOS 5 - BroadCom BCM5721


Hey guys,

Here is my issue. I'm setting up a new server and came accros an odd issue. For some reason, after a few minutes, my NIC will stop anwsering to INBOUND traffic, that is, anything coming from the outside world to it. If I ping the server, it will tell me that all is good, but that is ICMP. If I start to sniff the packets on the interface, I realize that NOTHING is sniffed execpt for "spanning-tree". Ssh wont go through, DNS queries, etc, all dropped even before I can sniff them with WireShark/Ethereal.

Now, if I go on the server, everything is working correctly. I can navigate the internet, ssh to any servers I want. Then, the fun part, if I do that, and use my other computer to ping the server, I can sniff the ICMP packets and i can SSH to it. Then, my dns receives the query once again.

Looks like there should be somekind of "keep-alive" flag on the NIC I missed. Or it could be driver issue.

Can someone point me to troubleshooting tips ? Anyone seen this ? I must say my troubleshooting skills on linux are very good, so any help will be appreciated.

* edit *
Iptables is NOT running and I tried with SELinux enabled/disabled

Last edited by vesperatus; 05-31-2007 at 09:41 AM.
 
Old 06-01-2007, 07:41 PM   #2
manwichmakesameal
Member
 
Registered: Aug 2006
Distribution: Slackware
Posts: 800

Rep: Reputation: 100Reputation: 100
Which kernel are you using?
 
Old 06-03-2007, 07:43 PM   #3
vesperatus
Member
 
Registered: Feb 2004
Posts: 44

Original Poster
Rep: Reputation: 15
I'm using the 2.6.18 Kernel, straight from the CentOS 5 install with all the updates automatically provieded by yum.
 
Old 06-03-2007, 09:57 PM   #4
jiml8
Senior Member
 
Registered: Sep 2003
Posts: 3,171

Rep: Reputation: 114Reputation: 114
How is the server's IP address specified? DHCP? Lease time?
 
Old 06-04-2007, 10:42 AM   #5
vesperatus
Member
 
Registered: Feb 2004
Posts: 44

Original Poster
Rep: Reputation: 15
The server has 2 NIC, one has a static ip adress, the other one is not used right now but will be statically assigned too.
 
Old 06-07-2007, 10:40 AM   #6
vesperatus
Member
 
Registered: Feb 2004
Posts: 44

Original Poster
Rep: Reputation: 15
I tried assigning the static ip to the other NIC, same problem has before.
I'm also configuring a PXE-BOOT and getting strange "PXE-E11: ARP timeout". I have the same dhcpd.conf running on another server and the same boxes will boot just fine with pxe...

Any ideas ?
 
Old 06-11-2007, 08:54 AM   #7
vesperatus
Member
 
Registered: Feb 2004
Posts: 44

Original Poster
Rep: Reputation: 15
Well, i'll give an update since I cant find a solution to my problem.

I deceided to install CentOS on another server box, just to see. I installed CentOS 5 on a Dell 1750, same dhcp configuration, SELinux and iptables activated and I have no problems at all. Looks like the NIC or the driver for it is the issue. When i'll have time to test more, i'll switch my two NIC and make sure it's not the card that is defect.

Also note that on the 1750, i dont get the "ARP Timeout" message on a box that uses it has a PXE server. At first I tought my configuration was the issue, but now, I have the certainty that the issue is the coming from the BCM5721 or the TG3 drivers for it. Is it CentOS 5 ? Is it the driver, I cant tell.
 
  


Reply

Tags
centos, networking


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
Broadcom Gigabit BCM5721 andybrr Linux - Hardware 1 05-19-2006 08:29 AM
Problems configuring a BCM5721 NIC Maldain Linux - Networking 4 05-09-2005 10:22 AM
NIC real time status / traffic monitor? KendersPlace Linux - Networking 3 09-10-2003 01:38 AM
Inbound traffic for port 80 Gerardoj Linux - Networking 10 05-29-2003 04:27 PM
Force outbound reply traffic to reuse inbound non-gw NIC? Jon- Linux - Networking 2 03-05-2002 04:50 PM


All times are GMT -5. The time now is 10:44 PM.

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