GRE problems

[Lourik Malan]

Hi there

I'm running FreeBSD 4.11 and some gre tunnels. It works fine on 4.11. But when 
i try the same thing on FreeBSD 5.4. It drops 90% of the packets. Can anyone 
please give me some advice.
 
PC1

gif_interfaces="gre0"
gifconfig_gre0="          18.1.2.1    18.1.2.2    link1"
ifconfig_gre0="      inet 18.1.1.1    18.1.1.2    netmask 255.255.255.252"
ifconfig_sis0="       inet 18.1.2.1                   netmask 255.255.255.240"


PC2
gif_interfaces="gre0"
gifconfig_gre0="          18.1.2.2    18.1.2.1    link1"
ifconfig_gre0="      inet 18.1.1.2    18.1.1.1    netmask 255.255.255.252"
ifconfig_sis0="       inet 18.1.2.2                   netmask 255.255.255.240"

Thanks