Blogging this as the munin docs suck a bit -- lovely and technical but no HOWTOs
anyway I have an out of the box debian munin install on my epia box (hostname mythic) and I wanted to also plot the network traffic on my swisscom VDSL router (which is SNMPable)
Magic incantation to /etc/munin/munin.conf is:
[mythic.localnet]
address 127.0.0.1
use_node_name yes
[router.localnet]
address 127.0.0.1
use_node_name no
(where I have a decent /etc/hosts for localnet) and then do
munin-node-configure-snmp router.localnet | sh
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