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New Member

Switch port not forwarding

I have assigned a VLAN to a switch port and the server cannot ping anything past it's own NIC. Any suggestions?

  • Other Network Infrastructure Subjects
5 REPLIES
VIP Purple

Re: Switch port not forwarding

Hello,

are you saying that your server cannot even ping any other machine in the same VLAN ? Can you post the configurations of your switch and your Layer 3 (if you have inter-VLAN routing configured as well) ?

Slight chance that your server is stuck with an old route in its routing table, you might want to issue the command:

route -f

to flush the internal routing table of your server.

Regards,

Georg

New Member

Re: Switch port not forwarding

Once I removed the dual NICs from the server, I am able to see part of my network. I am still having trouble seeing the DNS. Another computer on the same VLAN in the same switch can see the DNS fine. Here are my configs. Any help is appreciated.

New Member

Re: Switch port not forwarding

First determine if this is a Layer 1,2 or 3 issue. Then focus on that Layer to troubleshoot. I.e check to see errors on that port to see if this a Layer 1 issue, then do "sh cdp neighbor" to see if the access switch can see the gateway, and so on.....try to gather as much info as possible...then troubleshoot.

New Member

Re: Switch port not forwarding

Doa route print and make sure that you don't have 2 default routes on your server inherited from your dual NIC setup.

New Member

Re: Switch port not forwarding

Also make sure your network settings on the problem server are similar to the settings on the computer that is working fine. You might have some old DNS stuff floating around.

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