[mrtg] Ongoing problem

Darryl Kegg Darryl.kegg at thehortongroup.com
Wed Sep 11 23:38:20 MEST 2002

I know I've posted this before, but I am going crazy...


Regardless of the PC I run MRTG on I have sporadic problems trying to graph
a series of Dell PowerConnect switches.  Things will hum along nicely for
days / weeks and suddenly I'll start getting the following error...


SNMP Error:

no response received

SNMPv1_Session (remote host: "" [].161)

                  community: "public"

                 request ID: -747181493

                PDU bufsize: 8000 bytes

                    timeout: 2s

                    retries: 5

                    backoff: 1)

SNMPGET Problem for ifInOctets.1 ifOutOctets.1 sysUptime sysName on
public at

WARNING: skipping because at least the query for ifInOctets.1 on did not succeed


            Stopping MRTG and restarting it several times in a row sometimes
fixes the problem, other times I have to wait a day or so and then it will
work, but obviously having big gaps in my graphs isn't very useful.


            Is it possible the switches are just getting overloaded and
can't respond to MRTG in time?  Is there a way to increase the timeout
threshold for MRTG so it will wait a bit longer or retry the SNMP get?  I
see the timeout and retries on the error, how do I bump these up?  Or am I
way off base here.


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