Unencrypted GRE Tunnels
Needs the ability to create unencrypted GRE tunnels.
DDoS is becoming more of an issue in todays world. The larger cloud based DDoS mitigation providers (Akamai and Cloudflare to name a few) use GRE tunnels from their cloud to facilitate services. Currently there is no way to implement these connections on a WatchGuard appliance.
This leaves 3 options, purchase expensive dedicated connections, find sub optimal DDoS providers or move away from Watchguard products to another Firewall vendor. Replacing the WatchGuards is seen as the easiest and lowest friction option.
The ability to create a GRE tunnel exists already, just not without layering encryption over it. This has to be a simple fix from a development perspective and has a strong business case to prevent users of enterprise appliances migrating away.