ACL with tunnels

[Dolphy]

Hi,

Here is my problem:

I have a cisco 1710 in the main office with 6 other offices. All the offices are VPN with the main using the INTERFACE TUNNEL #. When I tried to create ACL to permit HTTP, UDP and ICMP from Internet to the Private Side of the main office, I can't see anymore the other offices and nobody from the main office are able to go on the Internet. I understand that the destination port number change when the answer come back, but what is the command or access-list I have to do to make it work !!

Thanks !