Re: Snort and matching window size?

[Matt Kettler <mkettler () evi-inc com>]

At 07:21 AM 6/30/2003 -0600, James Lay wrote:
> alert tcp $EXTERNAL_NET any -> $HOME_NET 6588 (msg:"AnalogX Proxy Server 
> Scan"; flags:S;)
>
> as my rule, but I'd like to know if there's a way to match the window 
> size.  I tried matchine it with a content matching keyword, but that 
> didn't work.  Does the content keyword match just the data portion of the 
> packet?  Or does it content match against headers as well?  Thanks all!
>
> James

Content matches the data only.

There is however an option to check the tcp window size directly, although 
it's not in the formal documentation...


Quoting Brian <bmc () snort org> from the snort-sigs list on 6/12/03:

> Snort has support for checking the window size.  It has been an
> undocumented feature for the last 2 years.
>
>    window:[!]<window_size>;





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