Stale interface info from snmpd (how to avoid caching?)

Hello,

I upgraded from snmpd 5.1.2 (Debian Sarge) to snmpd 5.2.1.2
(Debian Etch).

I noticed that now snmpd caches the interfaces descriptions, so 
if I have some interfaces that goes down and up again (like a ppp 
connection or some OpenVPN tunnels), I can find stale information 
from snmpwalk:

  # snmpwalk -v 1 -c public 127.0.0.1 | grep ifName
  IF-MIB::ifName.1 = STRING: lo
  IF-MIB::ifName.2 = STRING: eth0
  IF-MIB::ifName.3 = STRING: eth1
  IF-MIB::ifName.4 = STRING: ppp0
  IF-MIB::ifName.5 = STRING: tun1
  IF-MIB::ifName.11 = STRING: ppp0
  IF-MIB::ifName.12 = STRING: tun2
  IF-MIB::ifName.14 = STRING: tun2
  IF-MIB::ifName.15 = STRING: tun1

Here ifName.4, ifName.5 and ifName.12 are stale (no longer 
existing) entries. This also breaks MRTG that remains stuck to 
the old entry.

Is there a configuration option or someting alike that prevent 
this "feature"?

-- 
Niccolo Rigacci
Firenze - Italy


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