Re: Question on port lists and negation

["Richard Bejtlich" <taosecurity () gmail com>]

On 10/8/07, John Curry <john.curry () metre net> wrote:
> Hello Richard,
>
> I believe something like the following should work, without the use of 'flow' in the rule.
>
> alert tcp any !PORTS -> any !PORTS
>
> The rule needs apply to packets going to and coming from the ports in the PORTS list.  I have not found the "->" 
> token to do anything to enforce direction since at least 2.4.3.  I've had to rely on the 'flow' option to enforce a 
> packet direction for TCP sessions.

Hi John,

Wow, that is an interesting observation regarding -> and 2.4.3.  Can
anyone from Sourcefire confirm this?

Thank you,

Richard

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