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Re: 16 year old bug

>>> I believe that non-contiguous netmasks actually are illegal nowadays.
>> Cite?
> 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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