[mrtg] ppp-trouble after upgrade (Debian lenny)

[Steve Shipway]

> after upgrading my server to lenny I notice that the interaction of mrtg
> (2.16.2-3) and snmpd (5.4.1-12) is somewhat troublesome.
> 
> As the dialup-ppp-device keeps changing its snmp-target-id I long ago
> resolved to using the name to address the interface:
> 
> #ppp0@:public at localhost
> 
> As this worked before, it does not anymore, I get the error:
> 
> "did not eval into defined data"

Try deleting the cache file (the .ok file that is with your .cfg file) as
this holds cached name->instance information.  MRTG will rebuild it.
Possibly the instance number has changed?

Steve
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