modprobe ipt_MASQUERADE echo 1 > /proc/sys/net/ipv4/ip_forward iptables -F iptables -t nat -F iptables -t mangle -F iptables -t nat -A POSTROUTING -o ppp0 -j MASQUERADE 엡티로 접속하면 PORT command failed! 가 나옵니다. 어떻게 해야죠?