Can Cacti reference interfaces by ip address?

[geekgerl]

Hello,

I work for an ISP, and we'd like to switch from MRTG to Cacti. We currently have MRTG configured to reference interfaces by ip address instead of by SNMP Interface Number. The reason we do this is so that we won't lose months of historical data when we add a new card to our router or switch (which causes the Interface Numbers to change on some or all interfaces).

Does Cacti have a similar setting we can enable to track by ip?

Thanks!

-Laura

[tgk]

The way cacti references interfaces by interface number is programmed in the xml query in resource/snmp_queries/interface.xml
I guess you could accomplish what you want by creating a new snmp query, which uses the IP as an index (ifIP) instead of the interface number (ifIndex).

[TheWitness]

The only problem is that if you have an interface with more than 1 IP Address, it will only display the last.

TheWitness

[Mark Susol]

ugh, so there's no way currently to use "eth0:abc" and "eth0:def" representing two IP virtual hosts on the same interface?

[TheWitness]

Cacti can do sub-interfaces, the only question is does your SNMP agent? If you walk the ifIndexes MIB, you will get your answer.

TheWitness

[Mark Susol]

I'll send you my snmp walk results by PM, i'm not sure which lines you are interested in seeing to know for sure. Appears eth0 is on index2, and the IPs point to the same index. I'm not a snmp expert.

[TheWitness]

These are the only interfaces that the standard Cacti templates will capture.

IF-MIB::ifType.1 = INTEGER: softwareLoopback(24)
IF-MIB::ifType.2 = INTEGER: ethernetCsmacd(6)
IF-MIB::ifType.3 = INTEGER: ethernetCsmacd(6)
IF-MIB::ifType.4 = INTEGER: tunnel(131)

TheWitness