Date: Sat, 13 Dec 1997 19:01:49 +0100 From: sthaug@nethelp.no To: joerg_wunsch@uriah.heep.sax.de Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: I seriously need some networking help Message-ID: <21537.882036109@verdi.nethelp.no> In-Reply-To: Your message of "Sat, 13 Dec 1997 15:37:55 %2B0100 (MET)" References: <199712131437.PAA22262@uriah.heep.sax.de>
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> > What IP does it use? If it uses the private one, you lose. This does > > break things like PMTU-D. > > It doesn't, even if the IP source address is 10.*. As long as the > ICMP packet has the correct recipient address, it will arrive, and the > (original) sender takes the appropriate actions -- it couldn't verify > the validity of the ICMP packet's sender address anyway, be it 10.* or > anything else. No, in many cases packets with RFC 1918 source addresses will *not* arrive - because they are blocked by packet filters meant to prevent IP address forgery. I know for a fact that UNINETT (AS 224) blocks such packets at its border routers. Using RFC 1918 addresses for router links on the Internet is *not* a good idea. Steinar Haug, Nethelp consulting, sthaug@nethelp.no
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