Re: can snort help detect bad spans?

[Jason Wallace <jason.r.wallace () gmail com>]

I could be wrong, but I don't see how Snort could identify that type
of issue. You would be better off monitoring the span port with Cacti
and generating an alert when the port is at a high utilization level
for a given amount of time.

Damn those network guys!

Thx,
Wally

On Mon, Mar 21, 2011 at 7:21 PM, Jason Haar <Jason.Haar () trimble co nz> wrote:
> Hi there
>
> We recently had an incident where an existing SPAN port had been allowed
> to get overloaded by the network group: you know, they spanned a VLAN
> and then upgraded from 100M to 1G switches without thinking the 100M
> SPAN port might struggle ;-)
>
> Anyway, is there any way snort could pick that up? I'm thinking the TCP
> streams must have been seriously corrupted for starters (i.e sequence
> numbers with huge gaps) - does that show up in the stats anywhere?
>
> Any other ideas for monitoring the quality of SPANs?
>
> --
> Cheers
>
> Jason Haar
> Information Security Manager, Trimble Navigation Ltd.
> Phone: +64 3 9635 377 Fax: +64 3 9635 417
> PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1
>
>
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