[Snort-users] Dynamic Addresses

Blake Frantz blake at ...319...
Tue Apr 10 12:55:43 EDT 2001

Snort allows you to use the -S switch from the command line to specify
variables that override the config file.  For example

Something like this (im on a linux 2.2.16 box):

-S HOME_NET=`ifconfig eth0|grep "inet addr"|cut -f2 -d":"|cut -f1 -d" "`

It's ulgy, but it should work.

You might also want to check out the script written by Sten Kalenda
Apeldoorn, which can be found at:


Hope this helps.


On Mon, 9 Apr 2001, Phil wrote:

> Given the new info that if you specify you're external
> interface your HOME_NET var needs to be you're extrnal
> IP and your EXTERNAL_NET var needs to be everything
> else... how do you handle dynamic IPs?
> I'm not sure exactly how Snort parses it's config
> file, but I'm guessing it doens't work like a shell
> script and I therefore cannot just use a `ifconfig
> ...` command and grep/xarg/etc. the IP out.
> Phil
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