NIC dropping inbound traffic after some time - CentOS 5 - BroadCom BCM5721
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 10:41 AM.