[mrtg] Re: MRTG or SNMP Oddity

Merton Campbell Crockett mcc at TO.GD-ES.COM
Tue Jan 21 02:26:05 MET 2003

On Mon, 20 Jan 2003, Holt Grendal wrote:

> Hello all,
> I'm having a strage problem with our mrtg bandwidth graphs when
> sudden spikes (DoS attacks) occur.
> Logging into the Cisco switch during the DoS attack and doing
> a "show int" on the involved ports clearly shows the attack going
> into port 1 and out of port 10, in bits/sec and packets/sec.
> I'm beginning to think there is some kind of problem with
> SNMP. Does anyone have any ideas or have seen this type of
> behavior before?

SNMP is discardable UDP traffic.  It is not unusual to see SNMP packets
discarded when a network device becomes overloaded.

Merton Campbell Crockett

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