ifconfig ${dev} ${main_ip} netmask 255.255.255.255 up
echo 1 >/proc/sys/net/ipv4/conf/${dev}/proxy_arp
echo 1 >/proc/sys/net/ipv4/conf/${dev}/rp_filter
ifconfig ${dev} ${main_ip} netmask 255.255.255.255 up
echo 1 >/proc/sys/net/ipv4/conf/${dev}/proxy_arp
echo 1 >/proc/sys/net/ipv4/conf/${dev}/rp_filter