[44net] Traceroute for IPIP ?

Hi group Is there any way to debug IPIP problems (for example traceroute ) ? because the IPIP is encapsulated packet the regular traceroute shows the destination tunnel only and if somewhere in the middle the packet get blocked it cant be traced .... If there is a tool in (preferred windows or even on Cisco router as a part of its CLI command set) unix i will be more then happy to know Thanks Forward Ronen - 4Z4ZQ http://www.ronen.org