From owner-freebsd-tokenring  Tue Apr 21 13:23:09 1998
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	Tue, 21 Apr 1998 16:20:13 -0400 (EDT)
Date: Tue, 21 Apr 1998 16:20:13 -0400 (EDT)
From: "Larry S. Lile" <lile@stdio.com>
To: "Matthew N. Dodd" <winter@jurai.net>
cc: tokenring@FreeBSD.ORG
Subject: Re: Current work...
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On Tue, 21 Apr 1998, Matthew N. Dodd wrote:

> On Tue, 21 Apr 1998, Larry S. Lile wrote:
> > #define ETHERMTU        (ETHER_MAX_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
> > #define ETHERMIN        (ETHER_MIN_LEN-ETHER_HDR_LEN-ETHER_CRC_LEN)
> 
> We've got a bit of a problem with MTU as it is dependent on our ring
> speed.  The MTU for a 16mb ring will be higher than the MTU for a 4mb
> ring.  Actually 'can be higher' is a better way to put it.
> 
> Some cards have a fixed speed (config the speed with a DOS util and live
> with it.  Some cards will autodetect ring speed on insert.  Some cards
> only support 4mb.

Yes, but there is some minimum and some maximum and by default we
should pick some arbitrary point and let each driver adjust it to 
fit its insertion speed.  
Also source routing can (I think) can affect the header size of the
packets.

Any good ideas?

> 
> > Also should we be going with TOKENxxx or ISO88025 ????
> 
> ISO88025 as that is what the sys/net/if_types.h calles it.

Ok, I will cut overy any existing common functions I have.

Larry
lile@stdio.com


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