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Re: [Idr] MP-BGP Extension and the Procedures for IPv4/IPv6 Mapping Advertisement

Chongfeng Xie <chongfeng.xie@foxmail.com> Mon, 18 March 2024 22:19 UTC

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Date: Tue, 19 Mar 2024 06:19:02 +0800
From: Chongfeng Xie <chongfeng.xie@foxmail.com>
To: Acee Lindem <acee.ietf@gmail.com>, idr <idr@ietf.org>
References: <A60F08E3-16BC-4E55-90E0-3039F8FA044F@gmail.com>
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Subject: Re: [Idr] MP-BGP Extension and the Procedures for IPv4/IPv6 Mapping Advertisement
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Hi Acee,

RFC6992 is for intra-domain, instead of multi-domain.

Best regards

Chongfeng

 
From: Acee Lindem
Date: 2024-03-18 22:05
To: idr
Subject: [Idr] MP-BGP Extension and the Procedures for IPv4/IPv6 Mapping Advertisement
Apologies if this has already been covered but it was clear from yesterday’s IDR meeting chat  that I’m not the only one who questions the necessity of this BGP extension.  

Why can you just use one of the IPv6 addresses ranges reserved for embedded IPv4 addresses as described in section 2.2.5 of RFC 4291? 

https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5

If you use these embedded IPv4 using the standard mappings there no reason to advertise explicit mappings. There is already precedence for doing this - https://datatracker.ietf.org/doc/rfc6992/


Thanks,
Acee

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