Date: Sun, 12 Nov 2000 02:09:27 -0500 (EST) From: "Richard A. Steenbergen" <ras@e-gerbil.net> To: achilov@granch.ru Cc: freebsd-net@freebsd.org Subject: Re: Traceroute and UDP port 33434 Message-ID: <Pine.BSF.4.21.0011120204530.13252-100000@overlord.e-gerbil.net> In-Reply-To: <3A0E399A.DF69446D@sentry.granch.ru>
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On Sun, 12 Nov 2000, Rashid N. Achilov wrote: > I have encountered a strange problem - when I deny UDP port 33434, > traceroute refuses to trace...Can the traceroute use the UDP port 33434? The default unix traceroute uses UDP probes destined to supposidly "unused" ports. This probe starts at 33434 (32768+666 :P) and increments once with each probe. The default behavior is 3 probes per hop (per TTL increment), with a maximium of 30 hops, which means the standard unix traceroute will target UDP ports 33434-33524. The traceroute program knows there is another hop when it receives a TTL Exceed, and knows it has reached the end of the trace when it receives a Dest Unreachable for those ports. If something is listening on those ports, the traceroute will fail. With FreeBSD traceroute, the parameter you're looking for to change this default base is "-p <port>". HTH -- Richard A Steenbergen <ras@e-gerbil.net> http://www.e-gerbil.net/humble PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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