Hi, all.
RFC2461 says TLL option SHOULD be requires in NA while responding to unicast NS.
4.4. Neighbor Advertisement Message Format
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1351 Possible options:
1352
1353 Target link-layer address
1354 The link-layer address for the target, i.e., the
1355 sender of the advertisement. This option MUST be
1356 included on link layers that have addresses when
1357 responding to multicast solicitations. When
1358 responding to a unicast Neighbor Solicitation this
1359 option SHOULD be included.
but RFC2461 also says 'MAY' be omitted.
7.2.4. Sending Solicited Neighbor Advertisements
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3387 If the solicitation's IP Destination Address is
3388 not a multicast address, the Target Link-Layer Address option MAY be
3389 omitted; the neighboring node's cached value must already be current
3390 in order for the solicitation to have been received.
It isn't contradiction, but it is unclear.
The former seems that it disallows omission of TLL option,
and the latter seems that it allows omission.
I think 2461bis can be more clear about this option.
Regards.
----
Yukiyo Akisada <[EMAIL PROTECTED]>
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