As prep for IPv6 log spam fixes in a future change. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This change adds to tsdns the ability to delegate lookups to upstream nameservers. This is crucial for setting Magic DNS as the system resolver. Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>