Richard Castro f1d9d6315f cmd/sniproxy: add support for sniproxy as subnet router
This PR adds the ability to pass in an --advertise-routes flag
to the sniproxy so that the sniproxy itself will also act as a
subnet router. This, alongside approving a Tailnet for extraRecords,
will allow 4via6, essentially pointing domains to a IPv6 address
that the sniproxy is advertising.

Updates #15372

Signed-off-by: Richard Castro <richard@tailscale.com>
2023-11-03 11:00:03 -07:00
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