[lwip-devel] [patch #9021] nd6: add support for RDNSS option as per RFC 6106

[Simon Goldschmidt]

Follow-up Comment #1, patch #9021 (project lwip):

Good idea, sorry it took me so long to write.

Lifetime should be in nd6.c to be able to issue RS before timeout (and only
ND6 seems to have a timeout).

We'd need to add some constants to configure DNS servers from multiple
sources. That would result in e.g.:
- index 0: manual server config
- index 1-3: ND6
- index 4-6: DHCPv6
- index 7-9: DHCPv4
And DNS must be changed to check all servers for NULL before giving up (it
currently only checks one next server and assumes the list is compacted and
starting from index 0).

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