Unknown Object Identifier (Sub-id not found

net-snmp version: 5.3.0.1
platform:   debian linux 

While walking by means of successive snmpgetnexts, traversing mib-2 is
OK up to:

snmpgetnext -v3 -Of -u v3_user -l authNoPriv -a MD5 -A elephant localhost \
.iso.org.dod.internet.mgmt.mib-2.ip.ipForward.ipCidrRouteTable.ipCidrRouteEntry.ipCidrRouteStatus.172.31.20.0.0.255.255.255.0.0.0.0.0

.iso.org.dod.internet.mgmt.mib-2.ip.ipForward.inetCidrRouteTable.inetCidrRouteEntry.inetCidrRouteIfIndex.ipv4."0.0.0.0".0.2.0.0.ipv4."172.31.20.1" = INTEGER: 2

But spits the dummy on taking the next step:

snmpgetnext -v3 -Of -u v3_user -l authNoPriv -a MD5 -A elephant localhost \
.iso.org.dod.internet.mgmt.mib-2.ip.ipForward.inetCidrRouteTable.inetCidrRouteEntry.inetCidrRouteIfIndex.ipv4."0.0.0.0".0.2.0.0.ipv4."172.31.20.1"

.iso.org.dod.internet.mgmt.mib-2.ip.ipForward.inetCidrRouteTable.inetCidrRouteEntry.inetCidrRouteIfIndex.ipv4.0.0.0.0.0.2.0.0.ipv4.172.31.20.1:
Unknown Object Identifier (Sub-id not found: inetCidrRoutePolicy ->
ipv4.172.31.20.1)

The same happens with:
   -m +IP-FORWARD-MIB      # Or
   -m ALL -M /usr/local/src/net-snmp-5.3.0.1/mibs/

Checking with -Dparse-mibs shows:
parse-mibs:   Module 19 IP-FORWARD-MIB is in
/usr/local/src/net-snmp-5.3.0.1/mibs//IP-FORWARD-MIB.txt

Given that snmpwalk cruises through this MIB, discrete snmpgetnexts
should surely do the same?

I've so far found good clues in the archives and Site Docs, but not yet
the right one. I'm clearly not holding my mouth right, but that's as
much as is clear just at the moment. Any hint on where to read, or where
to poke it with a stick, to further diagnose, would be most gracious.

Erik


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