SSH Session disconnecting with pf

[Torsten at CNC-LONDON]

Hi All
Thank you very much for the comments.
This may explain some VPN issues I had in the past as well. 
Regards
Torsten

-----Original Message-----
From: owner-freebsd-pf at freebsd.org [mailto:owner-freebsd-pf at freebsd.org] On
Behalf Of Elliott Perrin
Sent: 08 April 2008 00:17
To: freebsd-pf at freebsd.org
Subject: Re: SSH Session disconnecting with pf

See Below

On Mon, 2008-04-07 at 16:07 -0700, Jeremy Chadwick wrote:
> On Mon, Apr 07, 2008 at 11:02:33PM +0100, Torsten @ CNC-LONDON wrote:
> > I'm running FreeBSD stable6.2  on all my servers and in the past one
year I
> > notices a random disconnection of persistent sessions to and from
servers
> > with  is running as PF the firewall
> 
> The big problem with your rules looks to be how you're determining SYN,
> and how you're using keep state.
> 
> Below are some comments.
> 
> >         SYN_ONLY="S/FSRA"
> 
> This is very, very wrong, and probably the cause of your issues.  This
> should be S/SA.

That is not very very wrong. 

Any TCP session starting up should only have the SYN flag set out of SYN
FIN ACK RST. As a matter of fact this is in theory a more secure setting
than S/SA (SYN out of SYN ACK). 

Cheers,
Elliott Perrin
elliott at c7.ca

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