[mrtg] odd problem bit of a challenge :)

[Paul Cousins]

I have managed to get mrtg logging on my interfaces on my remote xp box. the problem is this the lan stats work fine my internet connection is ISDN and as such is up and down like a yoyo the stats for the isdn work fine untill the modem is disconnected then reconnected. with this the interface picks up a new snmp id and of course breaks the cfg file as it is looking for the old one the error i get is this. is there way to enable the logs to continue as they should after a reconnect? 

Any help greatly appreciated.

SNMP Error:
Received SNMP response with error code
  error status: noSuchName
  index 1 (OID: 1.3.6.1.2.1.2.2.1.10.393220)
SNMPv1_Session (remote host: "frodo.home.local" [192.168.0.1].161)
                  community: "public"
                 request ID: 1739474972
                PDU bufsize: 8000 bytes
                    timeout: 2s
                    retries: 5
                    backoff: 1)
 at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_util.pm line 458
SNMPGET Problem for ifInOctets.393220 ifOutOctets.393220 sysUptime sysName on public at frodo.home.local:
 at /usr/local/mrtg-2/bin/mrtg line 1620
WARNING: skipping because at least the query for ifInOctets.393220 on  frodo.home.local did not succeed
ERROR: Target[frodo.home.local_393220][_IN_] ' $$target[1]{$mode} ' did not eval into defined data
ERROR: Target[frodo.home.local_393220][_OUT_] ' $$target[1]{$mode} ' did not eval into defined data
WARNING: Skipping Update of frodo.home.local_393220, inlast is not defined
WARNING: Skipping Update of frodo.home.local_393220, outlast is not define

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