/etc/default/tailscaled

cat /etc/default/tailscaled
# Set the port to listen on for incoming VPN packets.
# Remote nodes will automatically be informed about the new port number,
# but you might want to configure this in order to set external firewall
# settings.
PORT="41641"

# Extra flags you might want to pass to tailscaled.
FLAGS=""

See also

• WireGuard, wg, wg-quick, Curve25519, wireguard-tools, Pritunl
• Tailscale, SD-WAN, tailscale login, status | tailscale --help ], ts.net, Tailscale SSH, Encrypted TCP relays (DERP), Terraform Tailscale