Tunnel Panel manages GRE tunnels and port forwarding on Linux servers from a web panel that previews every change before it runs and verifies the result against the kernel. Create GRE, GRETAP, IP6GRE, and IP6GRETAP tunnels and see the exact commands, unit file, and rollback before anything is applied. The far end configures itself from a pairing code, as text or QR, with the sides flipped automatically so the two ends cannot disagree by a typo. Native ICMP probing with hysteresis keeps a single dropped packet from flapping a tunnel between down and back, and when ICMP is filtered the panel knocks over TCP and says so instead of crying wolf. Forward any TCP or UDP port, or a whole range, with round-robin, source-hash, or weighted balancing across destinations, and a backend that stops answering its health knock leaves the ruleset until it recovers. Watch every connection crossing the relay, who connected, which destination took them, and how much has moved, and set traffic limits per tunnel, rule, or destination. When something breaks, diagnostics reach a verdict with evidence and a suggested fix, backed by a streaming manual probe and a path-MTU search that offers to apply its findings. The panel reads your kernel's relay limits, recommends values from the host's memory and cores, and refuses changes that would lock you out of your own server. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.