[mrtg] mrtg of Cisco routers via Internet fails

[tom.voussure at sita.be]

Hi,

I monitor my network (cisco routers) with MRTG and it workes really
great...

But I have a problem with monitoring routers via Internet.

I have several Internet connection. Some or completely separated from our
main network.

So to monitor these routers, i have to go thru a firewall, on the internet,
to the other router.
(mrtg server --> firewall --> INTERNET --> router)

I always get the same error:
--base: Get Device Info on xxx at 210.88.234.215:
SNMP Error:
no response received
SNMPv1_Session (remote host: "210.88.234.215" [210.88.234.215].161)
                  community: ""xxx"
                 request ID: -1222128975
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
 at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_util.pm line 570
SNMPWALK Problem for 1.3.6.1.2.1.1 on xxx at 210.88.234.215.
 at /usr/local/mrtg-2/bin/cfgmaker line 709


If a try a snmpget i get also "Timeout, no response from ..."

Now, I'm sure that the snmp settings on the router are correct. The router
is configured the same way as all my other routers.
The firewall settings are also correct. I get no deny's in the logs.

I've also tried changing the packetsize of the snmp-packets send by the
router, but it doesn't help....

Anybody any idea ?


thx,
tom

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