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Re: [Softwires] Working group last call for draft-ietf-softwire-map-dhcp-07

Ole Troan <ot@cisco.com> Thu, 24 April 2014 08:16 UTC

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From: Ole Troan <ot@cisco.com>
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Date: Thu, 24 Apr 2014 10:15:57 +0200
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To: Ian Farrer <ianfarrer@gmx.com>
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Archived-At: http://mailarchive.ietf.org/arch/msg/softwires/3m32KQtFiV0RU0kxvUHEY5-4-mE
Cc: Softwires WG <softwires@ietf.org>, Yong Cui <cuiyong@tsinghua.edu.cn>
Subject: Re: [Softwires] Working group last call for draft-ietf-softwire-map-dhcp-07
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Ian,

> When receiving the Port Parameters option with an explicit PSID, the
> client MUST use this explicit PSID in configuring its softwire interface.
> If the client’s IPv4 address (configured via a separate sub-option) 
> is not 32 bit-long, the Port Parameters option MUST be discarded.  
> For MAP-E and MAP-T clients, the formula for the address length check
> is "prefix4-len + ea-len = 32” and serves to ensure that  the explicit
> PSID is only applied to configurations with a completely formed IPv4 address.

I don't like the implications that IPv4 address can be != 32 bits. ;-)

just simply:

The Port Parameters option with an explicit PSID MUST be discarded if the softwire node isn't configured with a full IPv4 address (e.g. IPv4 prefix).

?

cheers,
Ole

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