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Date:      Wed, 16 Jun 1999 23:33:06 +0700 (ALMST)
From:      Boris Popov <bp@butya.kz>
To:        "Justin C. Walker" <justin@apple.com>
Cc:        freebsd-net@FreeBSD.ORG
Subject:   Re: Multiple ethernet frames for IPX
Message-ID:  <Pine.BSF.4.10.9906162320070.17173-100000@lion.butya.kz>
In-Reply-To: <199906161602.JAA00643@walker3.apple.com>

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On Wed, 16 Jun 1999, Justin C. Walker wrote:

> > 	In case of IPX protocol you have network numbers as a routing and 
> > forwarding criteria, and since one frame have only one corresponding 
> > network number it is easy to select outgoing interface. If host have no 
> > direct connection to destination network it will use routing entries 
> > gathered from RIP packets. So, it doesn't matter which frame type  
> was on
> > incoming packet. As a special case consider routing between different 
> > frame types on a single ethernet segment.

>   I understand how routing works.  What I'm missing is how the  
> sending host (whether originator or forwarder) decides how to  
> encapsulate a frame, i.e., in your case, how to chose which virtual  
> device to use.  Is it the case that the network number determines the  
> encapsulation?  Is ARP used, and if so, does the ARP reply dictate  
> how to encapsulate?

	I'm playing with IP now (and don't like how arp subroutines create
packets) so can spoke only for IPX. And yes, you are right - network
number determines outgoing interface and, therefore - encapsulation.

--
Boris Popov
http://www.butya.kz/~bp/



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