[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: AHbis comments
At 4:04 PM -0400 6/16/03, Black_David@emc.com wrote:
>Here are a couple of transport related comments on
>draft-ietf-ipsec-rfc2402bis-03.txt . These have no
>effect on the specified processing - they're mostly
>about updating the explanation and references.
>
>Section 3.3.3.1.1.1 describes the TOS field in the IP
>Header as mutable (that's correct) and says:
>
> TOS -- This field is excluded because some routers are known to
> change the value of this field, even though the IP specification
> does not consider TOS to be a mutable header field.
>
>That's no longer correct. The TOS field has now been
>replaced by a 6 bit DS field (contains a Diffserv
>codepoint) plus a 2 bit ECN field, and both are defined
>to be mutable. RFC 2780 and RFC 3168 should be cited
>as the basis for this, and possibly also RFC 2474. The
>same 6 bit DS + 2 bit ECN structure applies to the IPv6
>(Traffic) Class field (section 3.3.3.1.2.1), which
>has always been mutable, as the same RFCs specify it.
>
>Thanks,
>--David
>
Thanks for the corrections. We obviously didn't look closely at this
part of the document when we edited the rest. We will make the
appropriate changes.
Steve