Additionally, for reference:
- Some D-Link devices have the: TCP, UDP, and an OTHER option. Selecting "OTHER," entering your destination LAN IP, and placing the number "4" in the field will NAT IPENCAP.
- All DD-WRT, OpenWRT and Microtik devices are known to accept DNAT configurations for IPENCAP.
- Any device that can accept a DNAT rule for IP Protocol Numbers (specifically, IP Protocol Number 4/IPENCAP) should work also.
- Lynwood KB3VWG