Hi. I have Net-SNMP v5.6.1 configured to generate engine IDs in the MAC
format, using the snmpd.conf statement "engineIDType 3". However, I've noticed
some systems configured this way actually running with engineIDs in Net-SNMP's
"random" format. When I tried to debug this by restarting snmpd with more
debug tokens, it returned to using the MAC format.
I noticed that the MAC address is obtained using socket() and ioctl() calls.
Is it possible that these could fail, depending on what's happening on the
processor, and the engineID default to random? I didn't notice such logic in
the code. Are there other error scenarios that would lead to random format
engineIDs?
Below are Wireshark trace snippets showing the same controller with a random
engineID then the intended, MAC-based one.
Thanks in advance.
Gary Dunlap
Frame 123 (185 bytes on wire, 185 bytes captured)
...
Internet Protocol, Src: 10.134.100.10 (10.134.100.10), Dst: 10.134.1.9
(10.134.1.9)
msgAuthoritativeEngineID: 80001F8880EB009929578E2E4E
1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
Engine Enterprise ID: net-snmp (8072)
Engine ID Format: Reserved/Enterprise-specific (128): Net-SNMP Random
Engine ID Data: EB009929
Engine ID Data: Creation Time: Jul 26, 2011 03:52:23
Now:
Internet Protocol, Src: 10.134.100.10 (10.134.100.10), Dst: 10.134.1.9
(10.134.1.9)
msgAuthoritativeEngineID: 80001F880300C0FFDB0659
1... .... = Engine ID Conformance: RFC3411 (SNMPv3)
Engine Enterprise ID: net-snmp (8072)
Engine ID Format: MAC address (3)
Engine ID Data: MAC address: DotHill_db:06:59 (00:c0:ff:db:06:59)
------------------------------------------------------------------------------
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