It looks like a problem I've seen before on AIX 4.2.1.  If your snmpd daemon 
is running ok, this may be due to a configuration problem in which the dpid2 
daemon, which serves as a translator between SMUX and DPI (SNMP Multiplexor 
Protocol and Distributed Protocol Interface) traffic, is not known to the snmp 
agent.  I resolved it by adding a 'smux' line to /etc/snmpd.conf for the dpid2 
daemon.
Here's what I did:

AIX provides an SNMP agent that uses SNMP Multiplexer protocol (SMUX).  DPID2 
is an
additional executable that works as a translator between DPI and SMUX. 

The DPI agent must run as a root user. Before you execute the dpid2 daemon, 
update the
/etc/snmpd.peers file and the /etc/snmpd.conf file as follows: 

     In the /etc/snmpd.peers file, add the following entry for dpid: 

     "dpid2"       1.3.6.1.4.1.2.3.1.2.2.1.1.2       "dpid_password"

     In the /etc/snmpd.conf file, add the following entry for dpid: 

     smux       1.3.6.1.4.1.2.3.1.2.2.1.1.2       dpid_password       #dpid

Refresh snmpd so that it will reread the /etc/snmpd.conf file: 

refresh -s snmpd

Start the dpid SMUX peer: 

dpid2

The daemons must be started in the following order: 

   1.SNMP agent 

   2.DPI translator  

If I recall correctly, I tracked this down via IBM's RS/6000 web site search.  
Regards,
   Scott Behrens


>>> j.caupain AT AMSTERDAM DOT NL 1/21/00 10:37:32 AM >>>
Hello everyone,

My /var filesystem is filling up rapidly because of the following
log-file
/var/tmp/dpid2.log
The following messages are being written to it allmost every second:

>  1/21 16:23:46 dpid2    10882 (root    )  lost connection to agent
>  1/21 16:23:51 dpid2    10882 (root    )  smux_wait: youLoseBig [ps2pe: Error 
> 0]
>
>  1/21 16:23:51 dpid2    10882 (root    )  lost connection to agent
>  1/21 16:23:56 dpid2    10882 (root    )  smux_wait: youLoseBig [ps2pe: Error 
> 0]

I know it has something to do with SNMP (which still doesn't work by the
way.......)

Anyone seen this before????
I run ADSM 3.1.2.50 on AIX 4.2.1

Thanx in advance for any help.

Regards