Iam having an issue where the GRE tunnels are up/up but are not pingable. The GRE tunnels are on a cisco 1811 and cisco 2811 routers The tunnel source and destination IP addresses are private addresses. These private addresses are pingable to each other and they are connected via IPSEC. The IPSEC tunnels are generated from the ASA to which the cisco routers connect. Probably the tunnels are up/up because keepalives are not configured. But I am still not able to see why I cnt ping the end points. The ACL for IPSEC in ASA includes the "permit gre host <Private IP 1> hist <Private IP 2>" commands.