RE: snmpget and snmpwalk return corrupt string instead of hex string when MAC address starts with non zero

When I add

>       PhysAddress
>             FROM SNMPv2-TC

To the IMPORTS list in the RFC1213-MIB.txt file - it works....

(albeit it changes the PHP formatting to require the use of the snmp_set_quick_print(TRUE); and snmp_set_valueretrieval(0); functions)

Is this safe to adopt in production?

Randy

From: Fulko Hew [mailto:[email protected]]
Sent: Wednesday, July 14, 2010 4:02 PM
To: Randall C Grimshaw
Cc: [email protected]
Subject: Re: snmpget and snmpwalk return corrupt string instead of hex string when MAC address starts with non zero


On Wed, Jul 14, 2010 at 3:33 PM, Randall C Grimshaw <[email protected]<mailto:[email protected]>> wrote:
Dave (cc: Fulko, etc)

When I tried to remove the RFC1213-MIB the apps fail.
ip.ipNetToMediaTable.ipNetToMediaEntry.ipNetToMediaPhysAddress.443: Unknown Object Identifier (Sub-id not found: (top) -> ip)

The only DISPLAY-HINT I can find in IP-MIB to use as an example is for Ipv6AddressIfIdentifierTC

I made the same 'junior' mistake when I look at the file a few hours ago :-)

In IP-MIB:
ipNetToMediaPhysAddress is defined as a PhysAddress
which is IMPORTed from SNMPv2-TC   (see the top of the IP-MIB file)
where the def'n of PhysAddress does indeed have a DISPLAY-HINT

I tried to add a hint to the RFC1213-MIB under ipNetToMediaPhysAddress and it also reminds me that I do not know what I am doing.
Bad format of optional clauses (DISPLAY-HINT): At line 1314 in /usr/local/net-snmp/5.5/share/snmp/mibs/RFC1213-MIB.txt
Bad parse of OBJECT-TYPE: At line 1314 in /usr/local/net-snmp/5.5/share/snmp/mibs/RFC1213-MIB.txt
ip.ipNetToMediaTable.ipNetToMediaEntry.ipNetToMediaPhysAddress.443: Unknown Object Identifier (Sub-id not found: (top) -> ip)

Now... you are probably stumbling over the problem of DISPLAY-HINT is probably
not allowed in an SMI v1 formatted file such as RFC1213.  Which is why you can't
(and shouldn't) try to change _that_ file.

But Dave's original comment remains correct...

Somehow you are picking up the definition of PhysAddr from RFC1213 instead
and should be picking it up from IP-MIB.

The question is 'why' isn't it?
When you removed the RFC1213, it complained that it couldn't find the 'sub-identifier'
called 'ip'.  Its as if It cannot find/read the IP-MIB file where 'ip' is defined.

------------------------------------------------------------------------------
This SF.net email is sponsored by Sprint
What will you do first with EVO, the first 4G phone?
Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first

_______________________________________________
Net-snmp-users mailing list
[email protected]
Please see the following page to unsubscribe or change other options:
https://lists.sourceforge.net/lists/listinfo/net-snmp-users