"MUST NOT" != "NOT REQUIRED"
See RFC 2119, but basically:
"MUST NOT" implies an absolute prohibition, not an optional requirement.
Kurt
At 11:56 PM 2001-09-19, Jiwoong Lee wrote:
All,
This is about the requirement level in the Internet specification.
If a statement has the requirement level of 'MUST NOT' while it has an
exceptional case, and while
the exceptional case does not elucidate its requirement level, what is the
appropriate requirement level of this exceptional case ?
I guess the answer is 'MAY'. Are you agreeable to this ?
I think ICMPv6 specification has the similar statements in it, regarding to
the requirement level of the generation of ICMPv6 packet in response to a
multicast packet or to a link local multicast packet.
Jiwoong