tailscale / tailscale/tailscale
FR: Dual-stack support in subnet router BIRD compatibility
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needs-triage
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Description
### What are you trying to do?
Use bird as documented in https://tailscale.com/kb/1298/subnet-bgp to route to the active subnet router in a failover pair in a dual-stack network
### How should we solve this?
Add a second protocol (maybe named 'tailscale6'?) in https://github.com/tailscale/tailscale/blob/c679aaba32c27681845466df9e6df69fe0704b95/wgengine/userspace.go#L1151
### What is the impact of not solving this?
Due to most protocols in bird being only ipv4 or ipv6, outside of select protocols such as maybe BGP, there's no way to switch routes for ipv6 in addition to ipv4 for the subnet router as documented.
### Anything else?
_No response_
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