[mrtg] oids and muti-target syntax

[grinnell at american.edu]

Hi, I'm trying to get the ammount of used memory on my linux system(
running ucd-snmpd).  I can't find an oid with exactly that info, so I want
to subtract the free mem from the total mem.  In my cfg I have the
following target:

Target[usedmem]: .1.3.6.1.4.1.2021.4.5.0:public at localhost -
.1.3.6.1.4.1.2021.4.6.0:public at localhost &
.1.3.6.1.4.1.2021.4.5.0:public at localhost -
.1.3.6.1.4.1.2021.4.6.0:public at localhost

but I'm getting this error when I start mrtg:

WARNING: Could not match host:'public at localhost' ref:'' key:''
WARNING: Could not match host:'public at localhost' ref:'' key:''
WARNING: Could not match host:'public at localhost' ref:'' key:''
WARNING: Could not match host:'public at localhost' ref:'' key:''

Could somebody help me with the syntax?
Thanks,
Michael


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