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midsizewisp
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Topic Author
Posts: 54
Joined: Tue Dec 08, 2009 10:34 pm

SNMP Problem When Different Ingress and Egress

Wed Apr 03, 2013 3:57 am

We have an issue where SNMP monitoring breaks when the route
in is different from the route out. This is mainly due to OSPF sending
traffic from our servers in a different way than the shortest path out.

Any idea how to resolve this?
 
Poundbury
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Posts: 14
Joined: Mon Feb 11, 2013 6:51 pm

Re: SNMP Problem When Different Ingress and Egress

Fri Apr 12, 2013 8:27 pm

I've noticed the same issue.
I'm hoping someone from Mikrotik will take a look at this thread and comment...
The behaviour is exactly the same as with Net-SNMP on generic Linux.
It was introduced I think in version 5.5, and I therefore assume that RouterOS uses a port of that version.
At the time, it was changed to allow broadcast SNMP support, but an unintended consequence was that it broke multi-homed installations.

It seems that the fix is in Net-SNMP version 5.7.
Perhaps Mikrotik can look into integrating this into RouterOS?

http://www.net-snmp.org/docs/NEWS.html
*5.7*
snmpd:
- Multi-homed agents send UDP responses from the proper IP address

Mike

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