Date: Wed, 12 May 1999 08:04:34 -0500 From: Guy Helmer <ghelmer@scl.ameslab.gov> To: boards yan <boardyan@yahoo.com> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Why not response? Message-ID: <Pine.SGI.4.10.9905120757570.9061-100000@demios.scl.ameslab.gov> In-Reply-To: <19990512025000.29712.rocketmail@web706.mail.yahoo.com>
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On Tue, 11 May 1999, boards yan wrote: > hi, > In a program, I have to implement a function. > That is, (not a hacker's idea) > > A--------------R----------------B > 1,A tries to make a tcp connection to B. > 2,R is A's default router. > 3,When R receive A's ip packet, it just changes the ip source address > by the address of itself. > Then R sends the packets. > R pretends that it is him that wants to establish a tcp connection > with B. > 4,B receives the packets, and responds to R... > > The issue is B does response icmp packets(ping), > but does not response tcp packets > as if it regards them illegal packets and therefore discards them. This sounds a lot like what the FreeBSD natd (network address translation daemon) can do... I think we could use the output from tcpdump running on B to help you diagnose this problem. Guy Guy Helmer, Ph.D. Candidate, Iowa State University Dept. of Computer Science Research Assistant, Ames Laboratory --- ghelmer@scl.ameslab.gov Research Assistant, Dept. of Computer Science --- ghelmer@cs.iastate.edu http://www.cs.iastate.edu/~ghelmer To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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