to clarify - you have a static route configured via VPN tunnel?
-> the gateway you included above, 10.55.10.51, is that the correct gateway reachable through the tunnel?
You also have a policy from a zone (of which your vlan10 interface is a member) to the tunnel?
-> have you checked the policy details for the following:
1. it allows ICMP
2. the source/destination addresses match your traffic
You can use the 'Policy Lookup' tool in the policy table to determine if you have a matching policy in place (to verify that your ping matches into the configured zone->IPSec policy):
Hope this helps :)
+++ Divide by Cucumber Error. Please Reinstall Universe and Reboot +++