Snort mailing list archives

RE: firewall and snort on the same machine


From: Dragos Ruiu <dr () kyx net>
Date: Wed, 15 Aug 2001 21:55:55 -0700

On Wed, 15 Aug 2001, Martijn Heemels wrote:
In my logs I don't see the "eth1 has entered promiscuous mode"
message that other people are reporting. How can I enable that
option?



I believe this is dependent on the kind fo nic driver you use and OS... 
I thought all the os/nic-driver combos logged promiscuous mode to syslog
but.... apparently not.

Normally just using snort is enough to make libpcap put the driver
in this mode...

This should also be a FAQ question/answer (he says going over to a vi window):

No, placing your driver in promiscuous mode does not constiture a major security
risk.  It _will_ slighltly increase cpu utilization dependent on network load as
the cpu no longer filters some packets at the nic and processes them all, 
but is not a cause for undue security alarm with typical, fairly robust,
network stacks.

cheers,
--dr

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