[ net-snmp-Bugs-1400101 ] 5.3 Destroyed netw. interfaces not removed from ifDescr list

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Bugs item #1400101, was opened at 2006-01-09 05:55
Message generated for change (Settings changed) made by tanders
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Category: agent
Group: linux
Status: Open
Resolution: None
Priority: 5
Submitted By: Scott Lamb  (slamb)
Assigned to: Nobody/Anonymous (nobody)
>Summary: 5.3 Destroyed netw. interfaces not removed from ifDescr list

Initial Comment:
Under Linux 2.6.14 using the tun driver with tinc, a new ifIndex is used 
every time the tunnel comes up. I.e.:

[slamb@rosalyn ~]$ /sbin/ip link show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 
1000
    link/ether 00:40:05:35:54:30 brd ff:ff:ff:ff:ff:ff
3: sit0: <NOARP> mtu 1480 qdisc noop 
    link/sit 0.0.0.0 brd 0.0.0.0
5: slamb.org: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1500 qdisc 
pfifo_fast qlen 500
    link/[65534] 
[slamb@rosalyn ~]$ sudo killall tincd
Password:
[slamb@rosalyn ~]$ sudo tincd -n slamb.org
[slamb@rosalyn ~]$ /sbin/ip link show
1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 
1000
    link/ether 00:40:05:35:54:30 brd ff:ff:ff:ff:ff:ff
3: sit0: <NOARP> mtu 1480 qdisc noop 
    link/sit 0.0.0.0 brd 0.0.0.0
6: slamb.org: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1500 qdisc 
pfifo_fast qlen 500
    link/[65534]

I _believe_ this behavior is correct, but net-snmp 5.3 can't deal with it. 
It accumulates multiple descriptions of the same device:

IF-MIB::ifDescr.6 = STRING: slamb.org
IF-MIB::ifDescr.7 = STRING: slamb.org
IF-MIB::ifDescr.8 = STRING: slamb.org

with only the latest marked as up. The old ones should be destroyed.

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Comment By: Matthew Darwin (mdarwin)
Date: 2006-01-15 15:17

Message:
Logged In: YES 
user_id=414456

I see the same problem (Linux 2.6.12-i386) using "vpnc". 
The problem exists in versions 5.2.2 and 5.3.



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