snmpd - snmpget and snmpwalk inconsistent

Hi,

I have observed a puzzling inconsistency between the get and walk requests
from snmpd. I am running the daemon on a Cumulus Linux switch. The
following shell sessions shows the issue.

### SERVER (stem) ###

ry@stem$ snmpd --version
NET-SNMP version:  5.7.3

ry@stem$ service snmpd restart

ry@stem$ pgrep -lfa snmpd
1298 /usr/sbin/snmpd -y -LF d /var/log/snmp -DALL -u snmp -g snmp -I -smux
-p /run/snmpd.pid -f


### CLIENT ###

## initial request for ifNumber using GET returns 0 (wrong)
ry$ date && snmpget -c public -v2c stem .1.3.6.1.2.1.2.1.0
Fri Apr 21 18:20:15 UTC 2017
iso.3.6.1.2.1.2.1.0 = INTEGER: 0

## initial request for ifNumber using WALK returns 11 (correct)
ry$ date && snmpwalk -c public -v2c stem .1.3.6.1.2.1.2.1.0
Fri Apr 21 18:20:20 UTC 2017
iso.3.6.1.2.1.2.1.0 = INTEGER: 11

## subsequent requests for ifNumber using GET returns 11 (correct)
ry$ date && snmpget -c public -v2c stem .1.3.6.1.2.1.2.1.0
Fri Apr 21 18:20:24 UTC 2017
iso.3.6.1.2.1.2.1.0 = INTEGER: 11

## after some time passes GET is back to being incorrect
ry$ date && snmpget -c public -v2c stem .1.3.6.1.2.1.2.1.0
Fri Apr 21 18:21:58 UTC 2017
iso.3.6.1.2.1.2.1.0 = INTEGER: 0

In doing some tests, I have determined that the value goes back to 0
exactly 1 minute after the walk was executed.



-- 
*ry**@isi*

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