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List Archive: gentoo-security
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To: "Ben Cressey" <ben@...>, <gentoo-security@g.o>
From: Oliver Schad <o.schad@...>
Subject: Re: firewall suggestions?
Date: Thu, 8 Jan 2004 21:55:29 +0100
Am Donnerstag, 8. Januar 2004 21:16 schrieb mir Ben Cressey:
> > To hide a host is always very stupid, why should you do this? There
> > is no advantage.  If you "hide" your computer an attacker knows there
> > is an stupid guy who doesn't know anything about network security.
>
> You're rather free with calling people "stupid" with little to no
> justification. One could as easily turn it around and ask "why should
> my server reply at all to connection attempts to ports I am not running
> any services on?"

    --------------[RFC 793 - Transmission Control Protocol]---------
 /
| Reset Generation
| 
|  As a general rule, reset (RST) must be sent whenever a segment 
| arrives which apparently is not intended for the current connection.
| A reset must not be sent if it is not clear that this is the case.
|
| There are three groups of states:
|
|    1.  If the connection does not exist (CLOSED) then a reset is sent
|    in response to any incoming segment except another reset.  In
|    particular, SYNs addressed to a non-existent connection are
|    rejected by this means.
 \
   ---------------------------------------------------------------

    --------------[RFC 792 - INTERNET CONTROL MESSAGE PROTOCOL]---------
 /
| If, in the destination host, the IP module cannot deliver the
| datagram  because the indicated protocol module or process port is
| not active, the destination host may send a destination
| unreachable message to the source host.
 \
   ---------------------------------------------------------------

What was your argument?

mfg
Oli

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Replies:
Re: firewall suggestions?
-- Stewart Honsberger
Re: firewall suggestions?
-- Paul de Vrieze
References:
Re: firewall suggestions?
-- Oliver Schad
Re: firewall suggestions?
-- Ben Cressey
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Updated Jun 17, 2009

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