topic "Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors in ExtremeWireless (General)

"Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors

Ilya_Semenov — Fri, 19 Jan 2018 14:41:00 GMT

Hello, everybody,

I've noticed a lof of error messages in Netsight > Control > Endpoints like:

1) Unable to resolve IP address using SNMP, NetBIOS or DHCP
2) MAC to IP Resolution Failed

I suppose that there is a connection between two messages. How can I solve the issue?

Many thanks in advance,

Ilya

RE: "Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors

Mike_Thomas — Fri, 19 Jan 2018 19:07:00 GMT

This is a good place to start.

https://gtacknowledge.extremenetworks.com/articles/How_To/NAC-Troubleshooting-Tips-Debug-Methodology...

There are also several other more specific artlcles on the knowledgebase regarding IP resolution.

RE: "Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors

Ilya_Semenov — Fri, 19 Jan 2018 19:07:00 GMT

Thanks, Thomas! I'll start the case in GTAC. Could you please share some links to the articles you've mentioned?)

RE: "Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors

Ryan_Yacobucci — Fri, 19 Jan 2018 19:07:00 GMT

Here is one that might be helpful: https://gtacknowledge.extremenetworks.com/articles/Solution/NAC-IPhost-resolution-failing-on-some-clients/?q=ip+resolution+failed&l=en_US&fs=Search&pn=1

Thanks
-Ryan

RE: "Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors

Ronald_Dvorak — Fri, 19 Jan 2018 20:20:00 GMT

From the screenshot I'd see that all the clients get the "default catchall" rule - what is the policy behind it > it assume if the login-LAT-port is set to 0 (=unauthenticated) that no DHCP is passing the port = no information in ExtremeControl.

RE: "Unable to resolve IP address using SNMP, NetBIOS or DHCP" and "MAC to IP Resolution Failed" errors

Ilya_Semenov — Fri, 19 Jan 2018 20:20:00 GMT

Hi, Ronald,

actually, I didn't get your idea... What shoul I correct to fix the problem?

Thank you!