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SNMP community string question

Posted on 2007-03-27
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Last Modified: 2012-05-05
Why is the trap string different? Would it be bad if I made it the same. Just starting to use SNMP pointing to a Solar Winds machine.

system-group-read-community     public
read-community  public
trap-community  SNMP-trap
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Question by:jjc_mn
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jeffkell earned 500 total points
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The SNMP trap community must match the community string on the trap receiver, it serves to authenticate that the traps are coming from valid sources (to keep someone from flooding the trap receiver with bogus traps).  The SNMP community strings in your clients are used to validate requests from the server, or in your case, Solarwinds.

What actually happens is Solarwinds issues an SNMP get to your client with what it thinks is your community string.  If the community string in the request matches your clients, the client will answer.

For a trap, the process is reversed.  Your trap goes out with the community string for Solarwinds.  When the trap is received, if the community string matches Solarwinds string, the trap is processed; else it is dropped.

It's not "one string" that is used both ways -- there is a password on your client (to answer queries) and a password on the server (to accept traps).
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