[freebsd 11.2] net-snmpd incomplete mac addresses

[Yuri Pankov]

Yuri Pankov wrote:
> Patrick Lamaiziere wrote:
>> Hello,
>>
>> freebsd 11.2/amd64 release
>> net-snmp-5.7.3_18
>>
>> net-snmpd returns incomplete MAC addresses in IF-MIB::ifPhysAddress,
>> the first octet is always "0".
>>
>> $ snmpwalk -v 2c -c "xxx" localhost 1.3.6.1.2.1.2.2.1.6
>> IF-MIB::ifPhysAddress.1 = STRING: 0:36:9f:93:7d:f8
>> IF-MIB::ifPhysAddress.2 = STRING: 0:36:9f:93:7d:fa
>> IF-MIB::ifPhysAddress.3 = STRING: 0:f4:bb:ef:c8:e4
>> ...
>>
>> $ ifconfig | grep ether
>>     ether a0:36:9f:93:7d:f8
>>     ether a0:36:9f:93:7d:fa
>>     ether ec:f4:bb:ef:c8:e4
>>
>> tcpdump confirms that the problem is in net-snmpd (and not the client).
>>
>> Also when using the MIB IP-MIB::ipNetToMediaPhysAddress the MAC
>> addresses are correct.
>>
>> $ snmpwalk -v2c -c '***r***' localhost IP-MIB::ipNetToMediaPhysAddress 
>> | grep a0:36:9f:93:7d:f8
>> IP-MIB::ipNetToMediaPhysAddress.13.10.10.1.118 = STRING: 
>> a0:36:9f:93:7d:f8
>>
>> I've checked net-snmpd 5.7.3 under linux and the mac addresses are
>> correct. (So it's specific to FreeBSD.)
>>
>> Any clue ?
> 
> It looks like net-snmp being stupid, try the attached patch (put to 
> files/).

For the note:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231996
https://sourceforge.net/p/net-snmp/code/merge-requests/20/