[mrtg] MRTG Problem with Target interface by type

Alberto Giampiccolo maxjampy at gmail.com
Tue May 1 10:04:28 CEST 2018

Hi all,
I have been using MRTG for several years and it is a useful and powerful 
I use it to monitor my TP-link adsl router, and when i use in the 
configuration the Inteface number everything work properly:

Target[]: 19:public at is the ip address of my router and 19 is the interface 
number for the ppp connection.

But for various reasons I can lose the connection and when the router 
reconnects it changes the interface number. To solve this problem I 
changed the configuration using the Target by Type:

Target[]: %23:public at is the ip address of my router and %23 is the interface type 

With this configuration the graphics are generated and everything works 
but I have the following error when I start mrtg:

Use of uninitialized value $tempv in concatenation (.) or string at 
c:/mrtg-2.17.4/bin\..\lib\mrtg2\SNMP_util.pm at line 755

How can i solve the error?

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