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533ceeaaf2
We are still using `Subnet.Contains` a lot but that does not handle IPv4 mapped to IPv6 addresses at all. It was partially fixed by #12094 in local network checking, but it may not always happen on LAN. Also make all local network checking to use IsInLocalNetwork method instead of just performing `Subnet.Contains` which is not accurate. Filter out all link-local addresses for external interface matching.