Are there any RFCs for address selection for IPv4

[Poul-Henning Kamp]

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Zhenlei Huang writes:

> Reading RFC 3927 2.7, it states link-local addresses are not routable. The router shall
> discard those packets from or to link-local addresses. Then it make no sense for a host
> to select link-local address as source address when it initialize a connection, except for 
> an edge case that the destination is also link-local address.

As I understand it, it only makes sense let the kernel select a LL address under two
conditions:

A) The destination is also LL *or* multicast

B) There is only one "UP" interfaces with an LLA.

Implementing the second criteria runs into us putting a (IPv6)LL
on the loopback interface.

Does anybody know why we put a (ipv6)LL on loopback interfaces ?

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.