Re: restarting snmpd does not generate a trap

--- Dave Shield <[email protected]> wrote:

> On 14/12/2007, PoWah Wong <[email protected]>
> wrote:
> > The trap receiver *didn't* log the trap until
> > I modify snmptrapd.conf to:
> > createUser -e 0x80001f88806a19937bd3c75547
> > test_MD5_AES MD5 12345678 AES 87654321
> > i.e. the modification is that I change the
> engineID.
> > Now it started to log the trap.
> > However, I am still confused about engineID.
> 
> Bottom line:
>     The username and engineID specified (either
> implicitly or explicitly) by the sending application
> must match the username and engineID specified
> (implicitly or explicitly) by the receiving
> application.
> 
> For most requests (GET, GETNEXT, SET, and INFORM),
> the receiving application will use a default
> engineID,
> and the sending application will first probe to
> discover
> the engine ID to use.   The effect that everything
> just
> works, and you don't have to worry about engineID.
> 
> That's not the case with TRAP requests.   Such
> requests
> are "non-acknowledged", so this engine probe
> mechanism
> isn't used.
> 
> In this situation, the safest approach is to
> *explicitly* specify
> the same engineID on both the sending side
> ("trapsess" in
> snmpd.conf) and the receiving side ("createUser" in
> snmptrapd.conf)
> 
> 
> Dave
>
Why I still get "usm: no match on engineID" message?
Isn't test_MD5_AES has the correct engineID?

# snmptrapd -f -Le -Dusm -d -c
/home/powah/snmp/snmptrapd.conf
...
usm: USM processing begun...
usm: match on user test_MD5_AES
usm: no match on engineID (80 00 1F 88 80 6A 19 93 7B
D3 C7 55 47 )
usm: match on user test_MD5_AES
usm: Verification succeeded.
usm: USM processing completed.
...


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