Date: Mon, 30 Oct 1995 18:11:48 -0500 From: dennis@etinc.com (dennis) To: Julian Elischer <julian@ref.tfs.com> Cc: hackers@freebsd.org Subject: Re: Unnumbered Interfaces Message-ID: <199510302311.SAA18575@etinc.com>
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>define un-numbered interfaces.. This seems to be the standard reply here...so here goes... Most routers have an option (which everyone seems to like) that allows a serial interface to be defined without a local address. This allows all interfaces on the machine to have the same address, almost always the primary ethernet address. For Example... ed0 Address: 192.1.1.1 ser0 PTP Address 211.14.17.1 ser1 PTP Address:215.27.1.1 When using unnumbered interfaces, all of the interfaces have a "local" address of 192.1.1.1. This is nice because all transactions from the host have the same source address, and you also save addresses by not having to use one for each logical or physical connection. Another and perhaps better method would be to have a host address for the machine, which would be applied as the source address for all unnumbered interfaces. It allows for the appearence of a single IP entity to the outside world, which of course is what a single host really is. Given that unix really resolves to a pointer (internally) and the local address is only used for reference....I would think that it can be done. You'd have to be able to configure a PTP interface without a local address... ifconfig ser0 unnum 211.14.17.4 or something of the sort, and all or your routing entries for this location would have to point at 211.14.17.4 which they should anyway. Of course things like gateD won't work with this....but in time it might. Dennis ---------------------------------------------------------------------------- Emerging Technologies, Inc. http://www.etinc.com Synchronous Communications Cards and Routers For Discriminating Tastes. 56k to T1 and beyond. Frame Relay, PPP, HDLC, and X.25
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