Snort mailing list archives
Re: Problems on Flowbits Option
From: Luo Xin <kingsleyluoxin () hotmail com>
Date: Wed, 12 Apr 2017 03:33:05 +0000
alert tcp any any -> $HOME_NET any (msg: "State 1"; GID: 1; sid: 10000001; flags: S; flowbits: isnotset, S1; flowbits: set, S1;) alert tcp $HOME_NET any -> any any (msg: "State 2"; GID: 1; sid: 10000002; flags: SA; flowbits: isset, S1; flowbits: set, S2;) alert tcp any any -> $HOME_NET any (msg: "State 3"; GID: 1; sid: 10000003; flags: A; flowbits: isset, S2; flowbits: set, S3;) My rules are something like this, and I hope to use this to detect syn flooding attacks. So how is it possible to describe the situation that is not accepted by the state machine? 在 2017/4/12 上午10:25,“Al Lewis (allewi)”<allewi () cisco com> 写入: It will help if you provided an example. “My rules don’t work” isnt much to go on :-) Albert Lewis ENGINEER.SOFTWARE ENGINEERING SOURCEfire, Inc. now part of Cisco Email: allewi () cisco com On 4/11/17, 9:58 PM, "Luo Xin" <kingsleyluoxin () hotmail com> wrote: > > >I am trying to build a state machine for TCP or other protocols. But I don’t know why my rules donn’t work. ☹ > >发件人: "Joel Esler (jesler)" <jesler () cisco com<mailto:jesler () cisco com>> >日期: 2017年4月10日 星期一 下午11:55 >至: Luo Xin <kingsleyluoxin () hotmail com<mailto:kingsleyluoxin () hotmail com>> >抄送: "snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>" <snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>> >主题: Re: [Snort-users] Problems on Flowbits Option > >Many people have done what you are trying to do. What are you trying to do?? > > >-- >Joel Esler | Talos: Manager | jesler () cisco com<mailto:jesler () cisco com> > > > > > >On Apr 10, 2017, at 3:55 AM, Luo Xin <kingsleyluoxin () hotmail com<mailto:kingsleyluoxin () hotmail com>> wrote: > >Hello, everyone! > > >I have been confused about the flowbits option. According to the snort manual, it is possible to use this option to implement a simple state machine. I have been trying to do that, but my tries prove to be failure. I have been wondering if I have wrong understanding about this flowbits option. > > >Is there anybody that has ever used flowbits option to implement a protocol state machine? If any, would you please be so kind as to help me solve my puzzles? > > >Any help shall be appreciated . >------------------------------------------------------------------------------ >Check out the vibrant tech community on one of the world's most >engaging tech sites, Slashdot.org<http://Slashdot.org>! http://sdm.link/slashdot >_______________________________________________ >Snort-users mailing list >Snort-users () lists sourceforge net<mailto:Snort-users () lists sourceforge net> >Go to this URL to change user options or unsubscribe: >https://lists.sourceforge.net/lists/listinfo/snort-users >Snort-users list archive: >http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users > >Please visit http://blog.snort.org to stay current on all the latest Snort news! > >------------------------------------------------------------------------------ >Check out the vibrant tech community on one of the world's most >engaging tech sites, Slashdot.org! http://sdm.link/slashdot >_______________________________________________ >Snort-users mailing list >Snort-users () lists sourceforge net >Go to this URL to change user options or unsubscribe: >https://lists.sourceforge.net/lists/listinfo/snort-users >Snort-users list archive: >http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users > >Please visit http://blog.snort.org to stay current on all the latest Snort news! ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Snort-users mailing list Snort-users () lists sourceforge net Go to this URL to change user options or unsubscribe: https://lists.sourceforge.net/lists/listinfo/snort-users Snort-users list archive: http://sourceforge.net/mailarchive/forum.php?forum_name=snort-users Please visit http://blog.snort.org to stay current on all the latest Snort news!
Current thread:
- Problems on Flowbits Option Luo Xin (Apr 10)
- Re: Problems on Flowbits Option Joel Esler (jesler) (Apr 10)
- Message not available
- Message not available
- Re: Problems on Flowbits Option Luo Xin (Apr 11)
- Re: Problems on Flowbits Option Al Lewis (allewi) (Apr 11)
- Re: Problems on Flowbits Option Luo Xin (Apr 11)
- Re: Problems on Flowbits Option Joel Esler (jesler) (Apr 12)
- Re: Problems on Flowbits Option Luo Xin (Apr 12)
- Re: Problems on Flowbits Option Joel Esler (jesler) (Apr 12)
- Message not available
- Message not available
- Re: Problems on Flowbits Option Luo Xin (Apr 12)
- Re: Problems on Flowbits Option Joel Esler (jesler) (Apr 12)
- Message not available
- Re: Problems on Flowbits Option Joel Esler (jesler) (Apr 10)