Hvorfor i alle dager legger du bare ikke inn greiene der de skal være?
Så slipper du å evt. knekke ting eller bli overstyrt av annen config.

modprobe 8021q -> /etc/modules
vconfig add eth0.102 -> /etc/interfaces/network
ifconfig eth0.102 hw ether A0:E4:CB:62:6C:B0 -> /etc/interfaces/network
ifconfig eth1 192.168.1.118 -> /etc/interfaces/network
dhclient eth0.102 -> /etc/interfaces/network
echo 1 > /proc/sys/net/ipv4/ip_forward -> /etc/sysctl.conf
iptables -t nat -A POSTROUTING -o eth0.102 -j MASQUERADE -> /etc/iptables.conf
iptables -A FORWARD -i eth0.102 -o eth1 -m state --state RELATED,ESTABLISHED -j ACCEP -> /etc/iptables.conf
iptables -A FORWARD -i eth1 -o eth0.102 -j ACCEPT -> /etc/iptables.conf