snmpd listening on a random UDP port

Any idea why snmpd would listen on a different UDP port every time it is
restarted?

Things are working for us on Ubuntu, but on our Debian Lenny devices
running net-snmp v5.4.1 the same configuration results in snmpd opening 2
udp listening ports instead of the single port we'd expect.

For example, if the IP address of the box is 192.168.1.111, this is what we
see:

# netstat -lnup | grep snmp
udp        0      0 0.0.0.0:63493           0.0.0.0:*
5031/snmpd
udp        0      0 192.168.1.111:161       0.0.0.0:*
5031/snmpd
udp        0      0 127.0.0.1:162           0.0.0.0:*
5035/snmptrapd

Having snmpd on port 161 and snmptrapd on port 162 is expected.  What I
cannot figure out is why snmpd is also listening on all interfaces on port
63493.  Every time I run "/etc/init.d/snmpd restart" that stray UDP port
keeps changing to some seemingly random value.

Here are parts of what I think are the relevant configuration files:

# cat /etc/default/snmpd
export MIBDIRS=/usr/share/snmp/mibs
SNMPDRUN=yes
SNMPDOPTS='-Lf /dev/null -u snmp -g snmp -I-smux -p /var/run/snmpd.pid'
TRAPDRUN=yes
TRAPDOPTS='-Lf /dev/null -u snmp -g snmp -p /var/run/snmptrapd.pid'
SNMPDCOMPAT=yes

# head -7 /etc/snmp/snmpd.conf
file /var/log/snmp.log 1
agentuser      snmp
agentgroup     snmp
agentaddress   udp:192.168.1.111:161,tcp:192.168.1.111:161
# agentxsocket tcp:localhost:705
master         agentx
agentxtimeout  2

Thanks in advance for any pointers.

Stéphane Charette

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