This is my situation and hardware:
My local LAN has 192.168.156.x ip range.
There is a 1721 router with lan port(192.168.156.252 ip configured) and a etherWIC installed with ip 10.102.100.252.
There is a wire connenting etherWIC to a TELDAT router(propiety of telefonica SAU of Spain, I can not configure this machine).
This TELDAT stablishes a VPN from there to a 10.104.100.8 machine.
I need to use the 1721 IOS firewall to filter the traffic from 10.10x.100.x but, I configured routing at 1721, but there is no ping.
What is wrong?