Date: Thu, 5 Feb 2004 15:17:04 +0200 From: "Alexander Botov" <alexb@mail.bg> To: <freebsd-questions@freebsd.org> Subject: forwarding with ttl=1 Message-ID: <004f01c3ebea$5974d750$0200a8c0@ALIENX>
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Hi All=20 I am newbie with configuring networks under FreeBSD . I have small = network with gateway running on FreeBSD 5.2 Release .My ISP offers me = pppoe service for connecting to Internet . I didn't have problems with = configuring ppp with pppoe . I used nat option wchich works fine for = masquerading the local network from the world . The problem is that the = ISP's gateway returns every time packets with ttl=3D1 which makes = further forwarding impossible . My gateway returns icmp error mesage = "time exceeded" and discards packets . I want to know if I made some = mistake with configuring nat service or if not what is the solution of = the problem ? Is there any service that can increment ttl and process = the packet ? I tried to avoid the checking of ttl in the ip_forward() = function in ip_input.c and skipping the decrement of ttl and everything = works fine but i think that this is very ugly kernel hack . Probably = there is an easy and elegant solution . Any ideas ? please excuse my English
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