[Snort-users] [OT] interface-mirroring on a server
detmar.liesen at ...348...
Fri Jan 10 10:59:11 EST 2003
----please reply directly because I am not on the list any more-----
Hi, this is a little bit off topic, but I am hoping for your help...
I am running tests with a VPN-gateway that will later act as an intermediate
gw for a site-to-site vpn:
[gw1] -> [public-net] -> [gw2] -> [private-net] -> [gw3]
The gw1 is out of my reach, regarding administration and surveillance, so I
want to run an IDS against the data that runs through the tunnel on gw2.
This is possible, because I can sniff on the internal interface that
connects the IPSec-layer to the normal IP stack on gw2, which is a linux-box.
However, I dont want to run an IDS on the VPN-box itself, because the box
will be loaded enough with encrypting and decrypting packets.
Can I somehow create a mirror on the internal interface,
i.e. copy all packets from the internal interface to a dedicated NIC which
is connected to an IDS?
I have thought about checking out the linux bridging drivers, but I think
with this software you can only send all packets from all NICs to all other
NICs but not selectively mirror packets, right?
What I need is something equivalent to a switch-mirror-port but for a
Is that feasible? Has anybody tried something like that before?
Thanks for your help.
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