[lwip-devel] [patch #7409] IPv6 support for LwIP 1.4.0RC1

[Ivan Delamer]

Follow-up Comment #33, patch #7409 (project lwip):

I'm working on IPv6 code again.

First of all, nice work Simon on ipX_ macros, it really cleaned the code up!

I'll be working on some improvements and optimizations, also adding support
for sending RA messages (if IP6_FWD is enabled).

One thing we need to discuss is, how are we going to specify an interface
identifier for link-local addresses. e.g. in Windows you will see FE80::1234%1
and FE80::5678%2 to refer to link-local addresses on interfaces 1 and 2.
Currently we can choose the outgoing netif by matching a source address to an
address for the netif. But if two netifs have identical LL addresses (which is
not unheard of) then we have a problem.

I only have a very poor idea, but it is better than no idea: use unused bytes
in the LL address to specify an interface index. e.g. FE80::1%2 would become
FE80:2::1. This would be internal to the stack and the 2 would be cleaned up
before passing to the user.

Any other ideas?

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