full-disclosure - Re: Crafted SYN Packets...

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Date: Tue, 13 Nov 2007 19:27:20 -0600
From: nocfed <nocfed@...il.com>
To: "Dean Pierce" <piercede@....edu>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Crafted SYN Packets...

Google for ephemeral port tcp syn

On Nov 13, 2007 5:43 PM, Dean Pierce <piercede@....edu> wrote:

> Simon Smith wrote:
> > Kelly,
> >       SYN packets and ports do not correlate. And yes, SYN is TCP. You
> should
> > read up on TCP/IP etc so that you understand protocols before posting to
> > mailing lists.
>
>
> Maybe then you could explain how it works :-)  From what I understand,
> the RFC doesn't really specify how source ports should be generated for
> new TCP sessions (Please someone correct me if I'm wrong, I am not
> intimately familiar with that particular set of RFCs).
>
> On my linux system I have currently have access to, the numbers I am
> getting seem pretty random (59101, 49607, 40343, 54786, 38335, ...)
> while the windows xp machine I am on seems to be rather sequential
> (12050, 12065, 10293, ...).
>
> Also, google claims that source ports have been used to identify worms
> etc where the source ports have been hard coded into the packet engine.
>
> Hopefully someone more familiar with the field responds :-)
>
>   - DEAN
>
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