Snort mailing list archives

RE: [SPAM] - RE: -i switch - Email found in subject


From: "Marc Hering" <mhering () reval com>
Date: Tue, 22 Mar 2005 09:25:48 -0500

Or just install a copy of Etheral and run a packet capture...it will give you the full interface name on a Winblows box 
:) 

-----Original Message-----
From: snort-users-admin () lists sourceforge net [mailto:snort-users-admin () lists sourceforge net] On Behalf Of 
Michael Steele
Sent: Tuesday, March 22, 2005 12:35 AM
To: 'Snort Users Postings'
Subject: [SPAM] - RE: [Snort-users] -i switch - Email found in subject

You will need to dive into the registry for those settings.

Kindest regards,
Michael...

WINSNORT.com Management Team Member
-- 
Pick up your FREE Windows or UNIX Snort installation guides       
mailto:support () winsnort com
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Snort: Open Source Network IDS - http://www.snort.org


-----Original Message-----
From: snort-users-admin () lists sourceforge net [mailto:snort-users- 
admin () lists sourceforge net] On Behalf Of Chris Reid
Sent: Monday, March 21, 2005 9:02 PM
To: snort-users () lists sourceforge net
Cc: Lee Clemens; Snort
Subject: RE: [Snort-users] -i switch

Some time ago the WinPcap developers gave us some code that could let 
you specify the GUID/UUID string instead of the interface number.  I'm 
not at my Snort development machine right now to verify that it was 
committed to the Snort source code, but try putting the whole "Device" 
string in quotes after the -i.  For example, using the interface below...

    -i "\Device\NPF_{9C7E2353-B2CB-4716-B424-582C30D2C4E2}"

would be the same as:

    -i 1

Chris Reid


On Mon, March 21, 2005 3:18 pm, Snort said:
The changing of the interfaces is a windows thing... I am not sure 
how you would hardcode the interface to a particular number. In the 
Unix world, no matter if you disable or not use an interface, it 
will always be what it was installed as or what you specify it as in 
the modules file. In windows, it changes based on if you disable or 
enable NIC, like you are experiencing now. To defeat the issue, you 
might have to come up with a script that will look for that NIC 
device string (found when you do snort -W), grep the interface 
number and start snort based on that interface. That makes your 
install a bit smarter so that you install 4 more nics for virtual 
webserver or pptp, snort will always start on that interface your looking for.

Interface       Device          Description
-------------------------------------------
1  \Device\NPF_{9C7E2353-B2CB-4716-B424-582C30D2C4E2} (Broadcom 
NetXtreme Gigabi t Ethernet Driver)
2 \Device\NPF_{444422A1-AB79-4CDB-B3C9-FF274A4C6152} (Intel(R) 
PRO/1000 XT Netwo rk Connection)


knowing the above, a script could* look like this

eth="Snort.exe -W | grep.exe -i "C6152" | cut.exe -b 1"

  ^ this will produce a result of "2"

Snort.exe -i"$eth" -o -c ../etc/snort.conf


Michael Brown

-----Original Message-----
From: snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net] On Behalf Of Lee 
Clemens Posted At: Monday, March 21, 2005 4:26 PM Posted To: Snort
Conversation: [Snort-users] -i switch
Subject: [Snort-users] -i switch


I have seen documentation with using the -i switch followed by a 
number and with eth0, eth1, etc... However, it seems this is OS 
dependent.

I am using windows and "Snort -W" does not supply the names of the 
connections (eth0,...). Is there any way I can cause these numbers 
to remain static or work around this issue some other way? I have 
tried installing Snort with "-i eth0" but OpenPcap fails to open the 
device.

I am asking this because I disable/enable some network connections 
on this computer periodically and this disrupts the numbering 
scheme, causing Snort to be looking at the wrong NIC. Thanks!






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