Hello
I’ve problem to access snmp devices through nat.
Some devices I can access others not …
All are the same devices…
What I see that I have problems it the device has logical interfaces and I want access with snmp to the logical interface…
Is this a problem of nat?
Greetings and thanks for any hint
Beat
Hmmm - this has been unanswered for a while. So, I’ll toss some energy at it, and see what we can get.
NAT – who is assigning nat addresses? Your router? Who is doing the NAT may have some impact.
I found these links,
How does SNMP work?
Network Monitoring Tools
and both are probably an insult to your intelligence, but we need to get started somewhere, and I (personally) haven’t the faintest idea of what needs to be done to fix your situation. Since quite a few ppl have viewed this post, I’m going to guess they thought the same thing. Let’s get some more detail in this thing, and see if we can get somebody with better experience than myself on board.
Hi
Found just the following article:
Network Address Translation > NAT Issues
Table 4-1 IP Traffic Types/Applications Supported by Cisco NAT
last entry in the table:
Traffic Types/Applications Not Supported
SNMP
So it’s seems a general “protocol problem” with NAT 
BTW: It’s my own linux router (an embeded device) which does the nat translation…
And just found an patch for netfilter
Netfilter Extensions HOWTO: New connection tracking patches
to use snmp with nat.
Will try this patch if I have time but I think it’s pretty complicated the netfilter stuff to integrate and compile the additionals …
Greetings
Beat