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3560 12.2 SNMP timeout mid-query / SNMP over TCP

solefald
Level 1
Level 1

Hello,

we have a setup where our monitoring box has to go through a linux box to get to 3560 to get snmp data, so i have a DNAT setup.

For some strange reason snmpwalk always times out on the same spot.

Right after

IF-MIB::ifHCOutBroadcastPkts.10152 = Counter64: 0

And before

IF-MIB::ifLinkUpDownTrapEnable.1 = INTEGER: enabled(1)

every single time.

snmpwalk -t 60 -v2c udp:linux_box:16108 -c community

(port 16108 DNAT'd to 161/udp)

everything works fine if i go to the switch directly

I figured i could use snmp over tcp, but it does not look like this switch even supports it...

does anyone know how to enable this?

thanks

2 Replies 2

Joe Clarke
Cisco Employee
Cisco Employee

SNMP over TCP is not supported. This sounds like some kind of buffer problem with Linux's DNAT module.

Since it looks like you're using net-snmp, you might try using its SNMP Proxy capabilities instead of DNAT. You just need to run the net-snmp snmpd on the Linux box.

See http://net-snmp.sourceforge.net/wiki/index.php/Snmpd_proxy on how to configure the proxy.

thank you so much! this solved my problem!

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