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:
http://m0n0.ch/wall/list/?action=show_threads&actionargs[]=200407#%2Farchive%2F71%2F19

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
appreciated.

Thanks,
-Chris