The struggle with IPv6 configuration is definitely something I can relate to. Setting up a stable connection with ULA addresses for internal server access can be tricky. I remember spending hours tweaking config files just to get it working right. Sometimes, when I felt completely overwhelmed, I'd take a break to clear my head. Simple games like Block Blast can be surprisingly effective at that! Anyway, back to IPv6: specifying the gateway is crucial. You typically need to define the default route in your network configuration file, pointing towards your IPv6 router's link-local address. The exact syntax will depend on your operating system, but that's the general principle. Hope this helps!