Date: Thu, 20 Apr 2000 17:45:49 +0200 From: Olaf Hoyer <ohoyer@fbwi.fh-wilhelmshaven.de> To: Gregory Bond <gnb@itga.com.au> Cc: freebsd-ipfw@FreeBSD.ORG Subject: Re: Pinging Firewall Message-ID: <4.1.20000420174210.00aacec0@mail.rz.fh-wilhelmshaven.de> In-Reply-To: <200004192337.JAA25250@lightning.itga.com.au> References: <Your message of Wed, 19 Apr 2000 15:55:24 %2B0200.>
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At 09:37 20.04.00 +1000, you wrote: >> Question: In which ways does a firewall handles pings? > >It is part of the low-level networking code in the kernel. > >> And, more important, in which phase of the TCP/IP receiving process of the >> ping may it be blocked? > >Ping has nothing to do with TCP. Ping uses ICMP packets. > >You can block pings using the appropriate rules in ipfw. > Hi! Sorry, really had the head full with other stuff... Had also to care last days about protocols like Netbios/Netbeui, so TCP/IP was just the opposite to that.... ;-) Are there any good sources, describing in detail, in which phase of the receiving process IP/ICMP/UDP packets are possible to filter/block? (Others than the 4.x BSD book, preferrably online...) Regards Olaf Hoyer -------- Olaf Hoyer www.nightfire.de mailto:Olaf.Hoyer@nightfire.de FreeBSD- Turning PC's into workstations ICQ:22838075 Liebe und Hass sind nicht blind, aber geblendet vom Feuer, dass sie selber mit sich tragen. (Nietzsche) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-ipfw" in the body of the message
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