Carlos
You have not told us much about the client environment, and especially have not told us what VPN client your users have. So I will assume that it is the Cisco IPSec VPN client. If it is different you can tell us and we will see where we go from there.
Assuming that it is the Cisco IPSec VPN client, check in the profile on the transport tab, and look for the check box for "Allow Local LAN Access" and check the box.
HTH
Rick
HTH
Rick