[lwip-devel] [bug #47923] on-link prefix cancellation issue

[abhishek ambure]

Follow-up Comment #2, bug #47923 (project lwip):

i am currently working on this, so patch is not ready now. will send you as it
gets ready.

scenario:- 
1) we got RA with prefix options as follows and process it for SLAAC
     prefix :- 2001:a8b0::
     prefix length :- 64
     on-link flag:- set 
     router life time :- 19000
     validation time :- 2000
     autonomus flag :- set.

   upon this information we had SLAAC, and our ipv6 address will be
2001:a8b0::EUI-64/64 valid for 2000 seconds.

2) but before 19000 seconds router wants to change this prefix to off link it
will advertise the same prefix with following changes
    on-link flag :- set
    router lifetime :- 0

on the receipt of (2) message our on-link prefix entry gets removed that is
fine, but with that the IPv6 (SLAAC) address also gets removed by putting its
state to INVALID.

So this must not happen even though prefix changes state to off-link. SLAAC
ipv6 address must be valid up to its validation time and as prefix entry is
removed, packets to this prefix destination should go through default router
entry.

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