RE: net-snmp proxy configuration

Hi Dave,

I added a '-e' flag to the proxy line in snmpd.conf:

proxy -e 80001370010A00002A -v 3 ...as before...

However, I've just realised that regardless of whether or not the engine
ID is specified, it's only my /first/ request that fails.  Subsequent
requests are fine.  Obviously in my previously testing I didn't have
time to issue /two/ requests in a row!  :)

Attaching a packet sniffer it looks like, when the first request is
sent, there's a whole series of exchanges between net-snmp and my other
agent (over a period of around 4 seconds), which culminates in my other
agent returning the requested value.  However, by this time, the snmpget
request has returned "NULL".  The next request is fine (and seems to
only involve a single get/response pair - presumably net-snmp is now
able to maintain the details of the second agent):

$ /etc/init.d/snmpd restart
$ snmpget -v3 -lauthNoPriv -aMD5 -Apassword -uuser localhost
.1.3.6.1.4.1.162.etc
(returns almost immediately)
SNMPv2-SMI::enterprises.162.etc = NULL
$ snmpget -v3 -lauthNoPriv -aMD5 -Apassword -uuser localhost
.1.3.6.1.4.1.162.etc
(returns almost immediately)
SNMPv2-SMI::enterprises.162.etc = INTEGER: 1

So the problem is not what I first thought - but it looks like the
request that is being made to net-snmp is being sent a response before
net-snmp has finished negotiating with the second agent.

This is not such a big deal (there's a pretty simple workaround), but it
does seem curious.

Cheers,


Alistair.


-----Original Message-----
From: [email protected] [mailto:[email protected]] On
Behalf Of Dave Shield
Sent: 12 March 2009 16:17
To: Young, Alistair
Cc: [email protected]
Subject: Re: net-snmp proxy configuration

2009/3/12 Young, Alistair <[email protected]>:
>     I've tried specifying the second agent's engine ID in snmpd.conf 
> but this didn't appear to help.

That would be my first approach, certainly.
How exactly did you try to do this?


Dave


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