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To: gentoo-security@g.o
From: Oliver Schad <o.schad@...>
Subject: Re: firewall suggestions?
Date: Fri, 9 Jan 2004 11:11:25 +0100
Am Freitag, 9. Januar 2004 07:36 schrieb mir Mark Hurst:
> > Probably you think ICMP is dangerous too. There are a lot of brain
> > dead admins who blocks ICMP packets and they wonder why connections
> > to some websites are broken or if they administrate the packet filter
> > before a webserver they wonder why some user grouches they wouldn't
> > get a connection to the web server.
>
> Ever heard of Smurf or Loki?
>
> If you allow all ICMP in you are indeed a brain-dead admin, in my
> opinion. Sure, host unreachable, DF should be allowed in, but why
> should an external host be able to send timestamp or subnet requests?

You can reject some unuseful things like that, but what I wanted to say is 
that communication is not bad you connect to the internet to communicate. 
There a different types of ICMP messages, you don't *need* all of them 
but you should know, that communication and ICMP is not a bad thing. 

mfg
Oli

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References:
RE: firewall suggestions?
-- MA
Re: firewall suggestions?
-- Oliver Schad
Re: firewall suggestions?
-- Mark Hurst
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