Re: [Softwires] Working group last call for draft-ietf-softwire-map-05

Hi,

I have one comment about the current version: It is using an IPv4 default route as the method for sending traffic out of the MAP domain. This is likely to cause provisioning complexity and conflicts with two other related drafts:

1, The unified CPE draft is looking for the presence of a configured BR/AFTR v6 address as the mechanism for whether to configure 'binding mode' (i.e. MAP 1:1 in this case). A v4 default route isn't easily compatible with this.

2, For DHCP based provisioning, the updated OPTION_MAP (described in the unified CPE draft) + RFC6334 give a method for configuring basic softwire functionality using just a DHCPv6 server. This doesn't provide any way of distributing IPv4 default routes. Therefore, to provision a MAP 1:1 client, you would need to deploy the DHCPv4 over DHCPv6 infrastructure just for this single DCHPv4 option. This is, of course assuming that the DHCPv4 over DHCPv6 method (draft-scskf-dhc-dhcpv4-over-dhcpv6) is the agreed mechanism for v4 over v6 provisioning.

I raised this point in Orlando (See Ole's comment on using RFC6334 as the DMR in the minutes). I think that this change would fix the two points above.

Thanks,
Ian

-----Original Message-----
From: softwires-bounces@ietf.org [mailto:softwires-bounces@ietf.org] On Behalf Of Suresh Krishnan
Sent: Dienstag, 26. März 2013 05:23
To: Softwires WG
Cc: Yong Cui; Ralph Droms
Subject: [Softwires] Working group last call for draft-ietf-softwire-map-05

Hi all,
  This message starts a two week softwire working group last call on advancing the draft about providing Mapping of Address and Port with Encapsulation as a Standards Track RFC. The authors believe that this version has addressed all the issues raised on the document. The latest version of the draft is available at

http://www.ietf.org/id/draft-ietf-softwire-map-05.txt
http://tools.ietf.org/html/draft-ietf-softwire-map-05

Substantive comments and statements of support/opposition for advancing this document should be directed to the mailing list. Editorial suggestions can be sent directly to the authors. The chairs will send in their comments as well during the last call period. This last call will conclude on April 9, 2013.

Regards,
Suresh & Yong
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