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Re: draft-narten-ipv6-3177bis-48boundary-04.txt

</chair>

or maybe this text...
While the devices in a home can presumably be enumerated by a single bridged /64 address space, this is also true of very large companies. The arguments that prevent deploying global bridged networks for large companies apply in the home as well. By policy, administrators may choose or be required to separate functions such as telecommuter LANs from the home network. For network management reasons, Multimedia channels such a HDTV may be routed through one part of a network while other data is routed in another. Even if policy and administrative considerations did not apply, not all subnet types are readily bridged - consider the various networks called Ethernet as compared to Bluetooth or Firewire. As such, SOHO networks require the ability to deploy multiple subnets.
Part of my reasoning here is to state that there are solid policy, administrative, and technical reasons for subnetting. Part of it is to avoid what sounds to me like marketing language - equating 2^64 with "an almost unlimited number of devices". The marketing folks will come up with imaginative enough language, we don't need to contribute to the hyperbole. 

On Mar 8, 2008, at 2:32 AM, Mark Smith wrote:


Hi Thomas,

On Fri, 07 Mar 2008 13:53:30 -0500
Thomas Narten <narten@us.ibm.com> wrote:


I updated this document before the cutoff, but apparently had an old
Copyright date in the document and it has not yet been posted.

The document can be found at
http://www.cs.duke.edu/~narten/ietf/draft-narten- ipv6-3177bis-48boundary-04.txt 

I made only small changes, in response to some of Tony's comments.



Suggested minor addition to the following in the summary, just to help
further show that bridging isn't always an alternative to
routing and multiple subnets:

"Although a /64 can (in theory) address an almost unlimited number
of devices, sites should be given sufficient address space to be able to lay out subnets as appropriate, and not be forced to use address conservation techniques such as using bridging. Whether or not bridging is an appropriate choice is an end site matter." 

"Although a /64 can (in theory) address an almost unlimited number
of devices, sites should be given sufficient address space to be able to lay out subnets as appropriate, and not be forced to use address conservation techniques such as using bridging. Whether or not bridging is an appropriate choice is an end site matter. 
        *(In some cases, bridging is not an available alternative to
routing or subnetting, as it requires a significant level of compatibility between the 
        link layer technologies being bridged. For example, it is not
        possible to bridge between Ethernet and Bluetooth.)*

Regards,
Mark.