[mrtg] Problem with cfgmaker after moving mrtg server to new subnet.

[Mersberger, Robert]

I have 2 AS400 servers on 172.20.x.x/24 and 172.24.X X/24 subnets that I
have been tracking with mrtg with the server on a 172.18.x.x/24 subnet .
Recently we upgraded to the latest release of Mrtg and it was installed
on a new subnet 172.31.16.x/22 and these two as400 servers stop
communicating with mrtg and cfgmaker. This is the error message that I
get.
? Is used to hide the real subnet 
SNMP Error:
no response received
SNMPv1_Session (remote host: "172.20.?.11" [172.20.?.11].161)
                  community: "public"
                 request ID: 614628054
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
 at /usr/bin/../lib/mrtg2/SNMP_util.pm line 490
SNMPGET Problem for ifInOctets.2 ifOutOctets.2 on
public at 172.20.?.11:::::1:v4only
 at /usr/bin/mrtg line 2035
Thursday, 25 January 2007 at 17:00: WARNING: skipping because at least
the query for ifInOctets.2 on  172.20.?.11 did not succeed
Thursday, 25 January 2007 at 17:00: WARNING: no data for
ifInOctets&ifOutOctets:public at 172.20.?.11. Skipping further queries for
Ho
st 172.20.?.11 in this round.

I have done sniffer traces on this activity and what I see looks like no
response from server.  In the trace I see 
Snmp request 
Snmp response 
ICMP destination unreachable.

I have verified the community string and know that I can do an snmpwalk
from servers on other subnets.
I also check with the server owner and had him verify that snmp on these
servers were not setup to not allow access from this subnet.  I have
other devices on this 172.24 and 172.20 subnet that are not causing
problems only these two IBM servers.

Hope you can straighten be out.





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