vpn over ipsec question

[Muhammad Reza]

Dear List.

I try to configure vpn over ipsec between two FreeBSD (4.10PRERELEASE 
and 5.1.p17) gateways.
My guidelines is from FreeBSD handbook,
Tunelling is workfine with gifconfig command, i can ping each internal 
interface from both side gateway.
The problem is when i try to securing the link with setkey command 
(setkey -f /etc/ipsec.conf), i cant no longer established connection 
between internal interface. (ping time out).
Please help me regarding this problem

regards
reza