Snort mailing list archives
Re: BPF for ECN Bits
From: Erik Fichtner <emf () servervault com>
Date: Thu, 24 May 2001 17:13:14 -0400
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Thu, May 24, 2001 at 12:19:21PM -0700, Joe McAlerney wrote:
I wrote this one a while back. It was tested, and seems to work. Please let me know if you find it is not doing the job. # snort <command options> not 'tcp[13] & 192 != 0'
Well, it works, but it doesn't work. It prevents snort from seeing ECNified packets--entirely. Which means, any ECN host can attack you with impunity and you'll never see it. Better to just patch spp_portscan and remove the queso fingerprinting rules if ECN is giving you grief. (spp_portscan needs a -dontflagecn option..) - -- Erik Fichtner Security Administrator, ServerVault, Inc. 703-333-5900 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.5 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE7DXlqQ7EzrewLMS0RAp9IAJ44e5LDsvec0sXXq6MvRMK2X/J0EQCcC8G7 shSjf1/z+jz4uYsP8yc5jHA= =nY1e -----END PGP SIGNATURE----- _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: http://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://www.geocrawler.com/redir-sf.php3?list=snort-users
Current thread:
- BPF for ECN Bits Erickson Brent W KPWA (May 24)
- Re: BPF for ECN Bits Joe McAlerney (May 24)
- Re: BPF for ECN Bits Erik Fichtner (May 24)
- Re: BPF for ECN Bits Max Vision (May 24)
- Re: BPF for ECN Bits Erik Fichtner (May 24)
- Re: BPF for ECN Bits Joe McAlerney (May 24)