Great Circle Associates Firewalls
(March 1995)
 

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Subject: Re: Filtering TCP establishe
From: Darren Reed <avalon @ coombs . anu . edu . au>
Date: Fri, 24 Mar 1995 00:07:37 +1000 (EST)
To: harrison @ wellfleet . com . au (Peter Harrison)
Cc: firewalls @ greatcircle . com
In-reply-to: <199503231259 . WAA13130 @ nico . aarnet . edu . au> from "Peter Harrison" at Mar 23, 95 10:57:51 pm

In some email I received from Peter Harrison, they wrote:
> 
>         Reply to:   RE>Filtering TCP established c
> > Someone mentioned that this is done by filtering on the SYN-ACK
> > reply packet (and only this packet).
> 
> I think the meaning of the comment was that (all) packets be filtered on the
> ACK bit, which, I believe, is what cisco is doing when they use the
> 'established' keyword. Please correct me if I'm wrong.....

But this would disallow connections in both directions, which is seldom
what is desired here (?).

darren



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