Ronen:
on the WAN interface allow: - IPIP Encap - IP Protocol 4
on your tunnel interface allow: - RIP44 - from 44.0.0.1 udp/520 to 224.0.0.9 udp/520
This information is available in the Wiki under: 'Setting up a Gateway with OpenWRT.'
As David noted, not all home router devices forward IPENCAP, the following are known to forward IPENCAP: OpenWRT/DD-WRT (and firmwares derived from them), some D-Link models, Linux OS routers and Microtik. Look in the archives for other devices.
You still need a method to parse/process AMPR routes, once received. The Wiki shows examples of Linux and OpenWRT Gateways that are setup and working fully.
73,
- Lynwood KB3VWG