[mrtg] Re: changing class C block to AT&T

[Jim Bradbury]

Bill,

Make sure you can ping the other box BEFORE you
start looking at SNMP and MRTG as the root of the
problem.

The most common problem/solutions here are
1) The SNMP agent is not up.
2) There No route to the SNMP agent (Try ping), or
3) The community strings don't match.

1) Check and make sure that the SNMP service is running on
the NT server.
2) Check and see if you can you ping the NT server box?
I bet you can't.
3) verify the community name on the SNMP agent matches
what is in MRTG.

Since you changed addresses, I bet you don't have a route
to your NT server.  They can be on the same physical wire
and not have a route to each other if the network addresses
are different.  Having different network addresses requires
going through a router to get to the other network.
Make sure BOTH systems have the default router (gateway) 
set correctly.  Since they are now on different networks,
the Gateway for each box will now be different.

-= Jim =-
-------- Original Message --------
Subject: [mrtg] changing class C block to AT&T
Date: Fri, 05 Jan 2001 14:05:07 -0800
From: Bill Parker <dogbert at mail.netnevada.net>
To: mrtg at list.ee.ethz.ch


Hi All,

	We are in the process of changing our IP address block from 
UUnet to AT&T since we are upgrading to a DS-3 circuit.  However,
on one of the machines which has already been changed over to
a AT&T IP address, and with snmp service running (it's a NT Server),
when I try to query the machine, I get no response received (here is
the output)...

./cfgmaker dbsinfo at xx.xxx.xx.80 > island.cfg
SNMP Error:
no response received
SNMPv1_Session (remote host: "xx.xxx.xx.80" [xx.xxx.xx.80].161
                  community: "dbsinfo"
                 request ID: 1798651873
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
SNMPGET Problem for sysDescr sysContact sysName sysLocation ifNumber
sysObjectID on dbsinfo at xx.xxx.xx.80
SNMP Error:
no response received
SNMPv1_Session (remote host: "xx.xxx.xx.80" [xx.xxx.xx.80].161
                  community: "dbsinfo"
                 request ID: 934478927
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)

What could have happened, all other machines on our old class C are
still graphing network traffic?

-Bill


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