<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, Sans-Serif;font-size:12pt"><div style="" class="">I'm trying to find a way to perform a snmpEngineID discovery process
as defined in RFC3414 chapter 4 in a manager.<br style="" class="">
<br style="" class="">
The process is pretty simple: you send a v3, usm Request message
with security level: noAuthNoPriv, empty user name, endineID and
varbinds. The agent then sends a report containing his engineID.<br style="" class="">
<br style="" class="">
I tried registering agent with empty or no security name defined,
but when I try to send the Request message I get:<br style="" class="">
<tt style="" class="">snmpm:register_agent("u", "a",
[{engine_id,[]},{address,[x,x,x,x]},{version,v3},{sec_model,usm},{sec_name,""},{sec_level,noAuthNoPriv}]).</tt><font style="" class="" face="sans-serif"><tt style="" class=""><br style="" class="">
</tt></font><tt style="" class="">snmpm:sync_get("u", "a", "auth", [], 1000).<br style="" class="">
<br style="" class="">
</tt><tt style="" class="">{error,{send_failed,1440625960,unknownSecurityName}}</tt><tt style="" class="">
</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">=ERROR REPORT==== 20-May-2014::11:12:57 ===</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">[ snmp : manager : snmpm_mpd : <0.55.0> ] </tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">MPD: CONFIG ERROR: unknownSecurityName (message:
{message,'version-3',</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">
{v3_hdr,996332938,484,</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class=""> [4],</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">
3,undefined,undefined},</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">
[48,24,4,0,4,4,97,117,116,</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">
104,160,14,2,4,85,222,53,</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">
40,2,1,0,2,1,0,48,0]})</tt><br style="" class="">
<br style="" class="">
I also tried registering a usm user with an empty (one space) name:<br style="" class="">
<tt style="" class="">snmpm:register_usm_user(" ", " ", [{sec_name, "initial"}]).</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">snmpm:register_agent("u", "a", [{engine_id, "
"},{address,[x,x,x,x]},{version,v3},{sec_model,usm},{sec_name,"initial"},{sec_level,noAuthNoPriv}]).</tt><br style="" class="">
<br style="" class="">
This time the message is sent, and the agent does respond with a
message containing his engineID, but this information is not
provided to the snmpm_user module:<br style="" class="">
<br style="" class="">
<tt style="" class="">=INFO REPORT==== 20-May-2014::12:21:45 ===</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">SNMPM default user callback received handle_error:</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class=""> ReqId: -1</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class=""> Reason: {failed_processing_message,</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class=""> {securityError,usmStatsUnknownEngineIDs}}</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class=""> UserData: undefined</tt><tt style="" class=""><br style="" class="">
</tt><tt style="" class="">{error,{timeout,1440625963}}</tt><br style="" class="">
<br style="" class="">
What is the proper way of doing this?<br style="" class="">
</div><pre style="" class="" cols="72">--
Cheers,
Dominik Pawlak</pre></div></body></html>