Starlink Debugging

Today at work was one of those days where the day was spent trying to ascertain why an IPsec tunnel wouldn’t work between two TP-Link Omada VPN routers. They worked when directly connected to one another but not across the Starlinks. The only differences in their configurations was a dynamic DNS IP address provided by no-ip for Starlink and hard coded IP addresses for the direct connections.

After far too long to admit, I noticed via the Starlink dashboard that one of the terminals had two IP addresses listed. The IPv4 address that no-ip was returning, and an IPv6 address one one. Once the terminal with multiple IP addresses was rebooted, everything worked perfectly again. The theory is that the one terminal was configured via a small wireless router so we could align the starlink terminals with the Starlink app got either the IPv6 or both the IPv4 and IPv6 addresses and it stuck with it while it was powered on.

At least it was solved by the end of the day. It was still very frustrating.