iOS IPv4 default route breaks IPv6?


I’m trying to understand the following.

I have set up ZeroTier as IPv4 only (with no IPv6 assignments, no IPv6 routes).

I have set an IPv4 default route to one of my hosts.

Enabling “full tunnel” on an iPhone on a cellular connection with both IPv4 and v6 results in the following:

For IPv4 everything works as expected, traffic is routed via the gateway host.

For IPv6 however, I’m losing all connectivity. I would have expected IPv6 to still work and be routed via the mobile carrier, as no IPv6 route (::/0 or otherwise) is set within ZeroTier.

I’d be grateful for any hints where I’m wrong here.

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