I've been going over my configs repeatedly and GRETAP just won't come up. This was working previously with an Ubiquiti router (based on VyOS) and I mimicked the configuration in the 1.5 setup. I even tried labeling the tunnel number as zero instead of one in case "tun0" wasn't implied by the tunnel number. I keep seeing interface errors on tun0 increment. I also can't ping the local side of the interface. On the other side, I can ping its local side. The IPSEC session and IKE both establish, it's the GRETAP tunnel that has the issue. I can post more details upon request.