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90c4067010
Remove IPv6 NAT check when routing is being set up using nftables. This is unnecessary as support for nftables was added after support for IPv6. https://tldp.org/HOWTO/Linux+IPv6-HOWTO/ch18s04.html https://wiki.nftables.org/wiki-nftables/index.php/Building_and_installing_nftables_from_sources Additionally, run an extra check for IPv6 NAT support when the routing is set up with iptables. This is because the earlier checks rely on being able to use modprobe and on /proc/net/ip6_tables_names being populated on start - these conditions are usually not true in container environments. Updates tailscale/tailscale#11344 Signed-off-by: Irbe Krumina <irbe@tailscale.com>