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Re: RFC 2401 section 5.2.1
itojun@iijlab.net wrote:
>
> > of prior art for tunnelling available before 2401 (at least 7
> > specifications, before and after 2401, use IP protocol #4.
> > 4 specifications use IP protocol #41).
>
> typo: 7 specs for protocol #41, 4 specs for protocol #4.
>
> itojun
Protocol type 4 inside IP is designated as specifed by RFC 2003.
While there may be prior or subsequent references, it has
already been delegated to exactly one official standard (standards track):
http://www.isi.edu/in-notes/iana/assignments/protocol-numbers
Joe
References: