Changing of ifDescr of SNMP of Debian Jessie

[Daniel Bareiro <daniel-listas@gmx.net>]

Hi all!

A few days ago I decided to migrate my own servers to Debian GNU/Linux
Jessie. Having migrated my firewall, I started getting an error in the
Nagios Manubulon plugin check_snmp_int.pl since it does not find the
interface eth1.

# ./check_snmp_int.pl -H 10.1.0.10 -l Us3r -x passw0rd0 \
> -X passwOrd1 -L md5,des -w 1500,295 -c 2500,400 \
> -k -B --label -M -B --label -n eth1
ERROR : Unknown interface eth1


This was running smoothly prior to migration, although it now seems to
have changed the description:


# ./check_snmp_netint.pl -H 10.1.0.10 -l Us3r -x passw0rd0 \
> -X passwOrd1 -L md5,des -n -v
Alarm at 10 + 5
SNMPv3 AuthPriv login : Us3r, md5, des
Filter :
OID : 1.3.6.1.2.1.2.2.1.2.2, Desc : Realtek Semiconductor Co., Ltd.
RTL-8100/8101L/8139 PCI Fast Ethernet Adapter
OID : 1.3.6.1.2.1.2.2.1.2.1, Desc : lo
OID : 1.3.6.1.2.1.2.2.1.2.3, Desc : VIA Technologies, Inc. VT6102 [Rhine-II]
OID : 1.3.6.1.2.1.2.2.1.2.4, Desc : tun0
Name : Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast
Ethernet Adapter, Index : 2
Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet
Adapter:UP:(1 UP): OK |


So I checked the equivalence between ifDescr and ifName:

# snmpwalk -v 3 -u Us3r -l authPriv -a MD5 -A passw0rd0 \
> -x DES -X passwOrd1 10.1.0.10 ifDescr
IF-MIB::ifDescr.1 = STRING: lo
IF-MIB::ifDescr.2 = STRING: Realtek Semiconductor Co., Ltd.
RTL-8100/8101L/8139 PCI Fast Ethernet Adapter
IF-MIB::ifDescr.3 = STRING: VIA Technologies, Inc. VT6102 [Rhine-II]
IF-MIB::ifDescr.4 = STRING: tun0


# snmpwalk -v 3 -u Us3r -l authPriv -a MD5 -A passw0rd0 \
> -x DES -X passwOrd1 10.1.0.10 ifName
IF-MIB::ifName.1 = STRING: lo
IF-MIB::ifName.2 = STRING: eth1
IF-MIB::ifName.3 = STRING: eth0
IF-MIB::ifName.4 = STRING: tun0


I could use something like this, but the output is extremely long:

# ./check_snmp_netint.pl -H 10.1.0.10 -l Us3r -x passw0rd0 \
> -X passwOrd1 -L md5,des -w 1500,295 -c 2500,400 -k -B --label -k \
> -B --label -n "Realtek.*"
Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8139 PCI Fast Ethernet
Adapter:UP (in=93.0Kbps/out=13.1Kbps):(1 UP): OK |


It's a pity If it can not solve because quite a while I was using the
check_snmp_int.pl plugin and was very happy with their results. But now
in Debian Jessie I'm having this problem. It seems that something has
changed in the SNMP service included in the new version of Debian since
before (on Debian Wheezy) the description matched the ifName:

# ./check_snmp_netint.pl -H srv01.freesoftware -C public -w 1500,295 -c
2500,400 -n -v
Alarm at 10 + 5
SNMP v1 login
Filter :
OID : 1.3.6.1.2.1.2.2.1.2.2, Desc : eth0
OID : 1.3.6.1.2.1.2.2.1.2.1, Desc : lo
Name : eth0, Index : 2
eth0:UP:(1 UP): OK |


I think it is easier to identify interfaces such as eth0, eth1, etc,
rather than by its manufacturer/model.



Any suggestions to return to the original behavior?


Thanks in advance.

Best regards,
Daniel