[mrtg] MRTG through firewall issue

Nick Bown Nick.Bown at fundshub.com
Mon Apr 9 15:19:13 MEST 2001

I have MRTG-2.9.10 running on a RedHat 7.0 test box at the moment and am
evaluating its use on a larger scale. I am monitoring a few Cisco 29xx
switches on the local network and everything is fine. However, I am having
difficulties with some more Cisco 29xx on a remote network as MRTG correctly
shows the hostname and uptime but not the traffic stats (the stats show 0
B/s in and out and the log files don't have any traffic stats in them). All
of the switches are running IOS 12 and the mtrg.cfg file is largely using
default values.
Between the MRTG host and the remote switches are two firewalls and I'm
wondering if these are causing the problems. I have opened ports UDP/161 and
TCP/161 on them... do I need to open any more (such as UDP/1161 and




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