[rrd-users] mrtg support for NAT

Simon Hobson linux at thehobsons.co.uk
Wed Feb 3 12:30:10 CET 2010

Nabil BouDiab wrote:

>has anyone successfully created targets for Natted IP addresses from MRTG?
>I need to monitor two remote networks that have overlapping IP 
>addresses. so we configured NAT on the gateway of one of the 
>MRTG server now sees all monitored devices as unique IP addresses.
>would the Natting cause any issues in looking up the OIDs? is this a 
>valid supported setup?

As long as your monitor is able to address the end device then it 
shouldn't cause any issues. The only thing I'd expect to be wrong 
would be any IP addresses read by SNMP which wouldn't match the 
target IP address due to the NAT. But since you are unlikely to be 
reading IP addresses with MRTG, I don't see this being a problem !

Simon Hobson

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