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From: brian@anorak.utell.net (Brian Somers)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: Two devices with same IP
Date: 22 Nov 1996 14:59:01 -0000
Organization: Coverform Ltd.
Lines: 28
Sender: brian@awfulhak.demon.co.uk
Message-ID: <574f3l$2s4@anorak.utell.net>
References: <56ltqk$nhv@csugrad.cs.vt.edu> <56lvvc$62f$1@gail.ripco.com>
<32920988.63E7@www.play-hookey.com> <571pde$mp8@sf18.dseg.ti.com>
<nigel.20.0000C75A@znet.net.au>
Reply-To: brian%anorak.coverform.lan@awfulhak.demon.co.uk
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In article <nigel.20.0000C75A@znet.net.au>,
nigel@znet.net.au (Nigel Gorry) writes:
:
: An ifconfig -a on my machine show that I have the same IP address for both my
: NIC and PPP interfaces. This works as a router with the default route being
: via the remote side of the PPP link.
:
: ed0: flags=8863<UP,BROADCAST,NOTRAILERS,RUNNING,SIMPLEX,MULTICAST> mtu 1500
: inet 203.61.202.20 netmask 0xfffffff0 broadcast 203.61.202.31
: lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> mtu 16384
: inet 127.0.0.1 netmask 0xff000000
: tun0: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1500
: inet 203.61.202.20 --> 203.61.202.1 netmask 0xffffff00
I don't get this. First, how come you're broadcasting on an address outside
of your network on ed0 ? ed0's netmask says that the allowable range is
203.61.202.{16-23} !
If the above machine sends a packet to 203.61.202.{16-19,21-22} (assuming
that 203.61.202.16 is your net address and 203.61.202.23 is your *real*
broadcast address, how does your kernel know which of ed0 and tun0 to send
the packet ?
--
Brian <brian%anorak.coverform.lan@awfulhak.demon.co.uk>
<http://www.awfulhak.demon.co.uk/>
Don't _EVER_ lose your sense of humour....
.