[Snort-users] A Couple of Questions

Eli Stair estair at ...7351...
Fri Jan 31 11:22:02 EST 2003

Lars, that sounds (to me) like it belongs in a NM package like Nagios or OpenNMS,
snort doesn't sound like the right place to be doing it (IMO).  Although your net
management software has no business (IMO) listening to the wire to check for 
damaged frames, etc.  And hardware errors like that would be unlikely to make it
above the data link layer, and thus not be detected by snort anyhow.  Feel free
to correct me if I'm wrong, anyone :)


On Fri, 31 Jan 2003 10:37:47 -0800
"Lars Borland" <lborland at ...8173...> wrote:

> Does anyone have an answer to my 2nd question?
> Has anyone written a rule for, or been able to use Snort to detect signs
> of a failing NIC?  I don't know the terminology off-hand but a dying NIC
> may start to "yell" at the network, causing the surrounding NICs to
> spend a lot of time dropping packets not specifically destined for them
> (they still have to look at the packets to know to drop them).  The NIC
> on the offending machine still appears to work somewhat but performance
> on the machine is very poor.  Also, the surrounding network (whatever is
> in the same collision domain) will suffer.  Incoming tech calls will be
> something like "Are things running kind of slow today?".  I've dealt
> with this sort of thing in the past and have luckily come across the
> failing NIC by chance.  I'd like to be able to pinpoint this sort of
> thing more easily using Snort if at all possible.  Please let me know if
> you're aware of any such rule.

CAUTION: Repeated use of finger can cause a system to become overloaded, which can cause it to stop responding.
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