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Re: 16 year old bug
>>> I believe that non-contiguous netmasks actually are illegal nowadays.
> RFC 4632 (CIDR Address Strategy), section 5.1:
...which is titled "Rules for Route Advertisement". (Also, 4632 is a
BCP, not a standard.)
> " An implementation following these rules should also be generalized,
> so that an arbitrary network number and mask are accepted for all
> routing destinations. The only outstanding constraint is that the
> mask must be left contiguous."
With respect to route aggregation in advertisements (ie,
exterally-visible behaviour). See the second paragraph of 5.2.
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