The following text is a suggestion to modify Section 4, rule 8.
Previous text:
Rule 8: Use longest matching prefix.
If CommonPrefixLen(SA, D) > CommonPrefixLen(SB, D), then choose SA.
Similarly, if CommonPrefixLen(SB, D) > CommonPrefixLen(SA, D), then
choose SB.
Rule 8 may be superseded if the implementation has other means of
choosing among source addresses. For example, if the implementation
somehow knows which source address will result in the "best"
communications performance.
Proposed test:
Rule 8: Use longest matching prefix.
If CommonPrefixLen(SA, D) > CommonPrefixLen(SB, D), then choose SA.
Similarly, if CommonPrefixLen(SB, D) > CommonPrefixLen(SA, D), then
choose SB.
Rule 8 may be superseded if the implementation has other means of
choosing among source addresses. For example, if the implementation
somehow knows which source address will result in the "best"
communications performance.
Also, an implementation that has knowledge of the prefix lengths
associated to the candidate source addresses MAY choose to
limit longest prefix match to those particular prefix lengths instead
of doing it on the full 128 bits.
Rule 9: optional tie breaker
If the above rules failed to choose a source address, an implementation MAY
either decide to pick a candidate source address randomly or to take the
smallest one in the lexicographic order. This rule is optional.
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