[Snort-users] var HOME_NET under Linux

Thomas Bechtold CharlieBlue at ...348...
Mon Jun 30 04:24:14 EDT 2003


hmm, I think you don't understand my problem.
I used in snort.conf the following line:
var HOME_NET $eth0_ADDRESS

And when i start snort with this conf i get the following error:

server:/etc/snort# snort -c /etc/snort/snort.eth0.conf
Running in IDS mode
Log directory = /var/log/snort

Initializing Network Interface ppp0

        --== Initializing Snort ==--
Initializing Output Plugins!
Decoding raw data on interface ppp0
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file /etc/snort/snort.eth1.conf

+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
ERROR: Undefined variable name: (/etc/snort/snort.eth1.conf:47): eth0_ADDRESS
Fatal Error, Quitting..
server:/etc/snort#

When i use 'var HOME_NET $ppp0_ADDRESS', it works!
Only if i use eth0 or eth1 it doesn't work and snort stops with a parse-error.
Interfaces eth0 and eth1 are up and running.

server:/etc/snort# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:50:FC:9E:46:44
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14438274 errors:110 dropped:0 overruns:0 frame:0
          TX packets:15323465 errors:0 dropped:0 overruns:0 carrier:0
          collisions:53803 txqueuelen:100
          RX bytes:3438876581 (3.2 GiB)  TX bytes:3431480714 (3.1 GiB)
          Interrupt:11 Base address:0x4f00

eth1      Link encap:Ethernet  HWaddr 00:04:AC:39:55:44
          inet addr:192.168.1.1  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14758554 errors:40 dropped:0 overruns:0 frame:40
          TX packets:13557678 errors:0 dropped:0 overruns:0 carrier:0
          collisions:72873 txqueuelen:100
          RX bytes:3073954506 (2.8 GiB)  TX bytes:3256223133 (3.0 GiB)
          Interrupt:15 Base address:0x7c60 Memory:f3dff000-f3dff038



Thanks for your help!
Thomas Bechtold


On Saturday 28 June 2003 21:24, Erek Adams wrote:
> On Sat, 28 Jun 2003, Thomas Bechtold wrote:
> > Ok, that works.
> >
> > Now I set the Variable HOME_NET in snort.conf to any:
> > var HOME_NET = any
> >
> > and when i start snort, i set the parameter i(interface) to eth0:
> > snort -c /etc/snort/snort.conf -i eth0
>
> If you want to reduce your false postives, change your HOME_NET to:
>
> 	var HOME_NET $eth0_ADDRESS
>
> Cheers!
>
> -----
> Erek Adams
>
>    "When things get weird, the weird turn pro."   H.S. Thompson
>
>
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