>gifconfig_gif10="192.168.100.1 xxx.xxx.xxx.xxx"
>ifconfig_gif10="inet 192.168.101.1 192.168.73.1 netmask 255.255.255.252 mtu 1376"
>route_vpn8=" -net 192.168.73 192.168.73.1"
>
>gifconfig_gif11="10.10.10.6 10.10.10.15"
>ifconfig_gif11="inet 192.168.100.1 192.168.72.1 netmask 255.255.255.252 mtu 1376"
>route_vpn9=" -net 192.168.72 192.168.72.1"

У вас маски разные

>gifconfig_gif0="10.10.10.15 10.10.10.6"
>ifconfig_gif0="inet 192.168.72.1 192.168.100.1 netmask 255.255.255.255 mtu 1376"
>route_vpn1=" -net 192.168.100 192.168.100.1"
>
>gifconfig_gif1="212.154.141.35 212.154.141.34"
>ifconfig_gif1="inet 192.168.73.1 192.168.101.1 netmask 255.255.255.255 mtu 1376"
>route_vpn2=" -net 192.168.101 192.168.101.1"