Hi,
Have you face such problem ? I have tried so many time , Site to Site IPsec VPN between Cisco 3825 and 1812 routers. but cannot findout the exact problem. my Network topology is attached herewidth. BO and HO are Cisco Routers where i have tried to setup Site to Site Ipsec VPN between Bo and Ho.at Ho Fortinet is used as Firewall and edge router. The DMZ (mail server, Active Directory, Web Server etc..) are connected via firewall . The VPN Phase 1 and Phase2 are Seems up and working perfectly while debuging i cannot findout any problem . I can ping all the DMZ as well as internet with jumbo frames and can access https, Mail .But cannot browse HTTP and AD(Active Directory) while using Site to Site Ipsec VPN between them. if i will remove the vpn then it work perfectly. my firewall policy is very simple and Allow engress and ingress traffic. any response are appreciated.
