Debian SNMP daemon is not listening on addresses other than the loopback.

By default, with sarge/etch at least, the SNMP daemon will only listen on the loop back.
Instructions to fix:
Under /etc/default/snmpd there is a config file, edit it.
Find the line that looks like:
SNMPDOPTS='-Lsd -Lf /var/log/snmpd.log -u snmp -I -smux –p /var/run/snmpd.pid 127.0.0.1'
And change it to read:
SNMPDOPTS='-Lsd -Lf /var/log/snmpd.log -u snmp -I -smux –p /var/run/snmpd.pid'
Then restart the SNMP daemon.