Code review request: Drop obsolete RFC-791 markings for QoS markings

[Iain Morgan]

According to www.rfc-editor.org, RFC 791 is not obsolete and is still a
standard, although it is updated by RFC 1349. Whereas RFC 2474 is only a
proposed standard.

Is that correct?

On Fri, Feb 18, 2011 at 16:03:44 -0600, Philip Prindeville wrote:
> Here's the bug and proposed patch.  It's pretty trivial.
> 
> https://bugzilla.mindrot.org/show_bug.cgi?id=1856
> 
> 
> Quoting RFC-2474:
> 
>     A replacement header field, called the DS field, is defined, which is intended to supersede the existing definitions of the IPv4 TOS octet [RFC791] and the IPv6 Traffic Class octet [IPv6]. [...] The structure of the DS field shown above is incompatible with the existing definition of the IPv4 TOS octet in [RFC791].
> 
> and:
> 
>     No attempt is made to maintain backwards compatibility with the "DTR" or TOS bits of the IPv4 TOS octet, as defined in [RFC791].
> 
> Also note that the patch that was originally proposed (but not accepted as-is) for bug 1733 attempted to disallow user setting of the QoS bits, also in accordance with RFC-2474:
> 
>     Correct operational procedure SHOULD follow [RFC791], which states: "If the actual use of these precedence designations is of concern to a particular network, it is the responsibility of that network to control the access to, and use of, those precedence designations."
> 
> 
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-- 
Iain Morgan