SNMP can't be queried over an IPsec VPN tunnel. Several of us in
#m0n0wall have tried this and it doesn't work.
This has been discussed before on the list in this thread:
And the general consensus was "there is no reason it shouldn't work",
but it doesn't.
From remove VPN, if I nmap UDP scan the LAN IP of the remote m0n0wall,
it shows 161/udp open. But snmpwalk won't pull anything. Not getting
blocked by the firewall.
I know there are workarounds, but some enlightenment on a solution or
why it doesn't work, for documentation purposes, would be much