[Ddclient-support] IP address query through SNMP

[Detlef G. <dgt...@ya...>]

Hello,

maybe it would be a nice feature if ddclient would support getting the IP address with SNMP from the device. I think this is a generic way to get the IP address. Most devices which are SNMP capable are then supported.

This feature works of course with the external command (use=cmd).

With the following command you "walk" through the interface table:

snmpwalk -v 1 -c public  192.168.1.1 IP-MIB::ipAdEntIfIndex

IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1
IP-MIB::ipAdEntIfIndex.192.168.1.1 = INTEGER: 2
IP-MIB::ipAdEntIfIndex.217.xx.y.z = INTEGER: 3

The loopback devices and rfc1918 adresses must be discarded. In most cases the remaining IP address is the one which is needed.

The Net::SNMP package ist needed if this query is done with Perl.


With best regards,

Detlef Graef