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000103_news@columbia.edu_Mon Aug 7 09:45:39 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: "Our" IP address
Message-Id: <1995Aug7.154539.58271@cc.usu.edu>
Date: 7 Aug 95 15:45:39 MDT
References: <405n1o$n6k@bug.rahul.net>
Organization: Utah State University
Lines: 48
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <405n1o$n6k@bug.rahul.net>, Clarence Dold <dold@rahul.net> writes:
> I am running MSKermit 3.14 over Novell IPXODI to a couple of UNIX boxes,
> using the builtin TCP/IP.
> I have one of the UNIX boxes set up as a bootp server, with the hardware
> addresses of each PC interface identified.
>
> All was well last week...
> Today, I cannot make a TCP connection from any of the previously working
> PCs. If I try, I get a message saying "Our IP address is in use by some
> other station". I look at show net, and the proper address has been plugged
> in by the bootp server, so some net com is working.
> I manually "set tcp addr 89.0.0.222", which is how I attach a PC initially,
> before I plug it into bootp, and I get the same message.
>
> Caveat:
> I recently attached a remote bridge, which doesn't work, either ;-(
> As soon as the remote dialup to the bridge occurs, the Netware console
> starts complaining "LAN loopback error detected
> Driver for network 00000001 received its own send packet"
That will be fatal for the ARP masquerade-test too. That remote
link is in bad shape.
>
> Is kermit seeing an echo on initial attempt to use the address I've
> assigned? I have a "Using C-Kermit" book, but I never have problems with
Affirmative.
> the UNIX side. I should have purchased the MSKermit book instead.
> Should I retrieve MSDOS source code to look for messages like this?
If you like, but that's not going to solve problems occurring
on the wire and in remote boxes. A better tool is a wire monitor.
To save you reading the code here is the essential piece:
if (imposter == 0 && arp_resolve(my_ip_addr, NULL))/* imposter check */
{
outs("\r\n WARNING: our IP address is used by");
outs(" another station! Quitting.");
return(0); /* fail back to user */
}
imposter++; /* say have done the check */
Joe D.
> --
> ---
> Clarence A Dold - dold@rahul.net
> - Pope Valley & Napa CA.