iptables -t mangle -A OUTPUT -m mark --mark $sliver_nid -j MARK --set-mark $temp_nid
iptables -t nat -A POSTROUTING -o $PPP_INT -j SNAT --to-source $ppp_addr
iptables -t mangle -I POSTROUTING 1 -m mark --mark $temp_nid -j MARK --set-mark $sliver_nid
iptables -t mangle -A OUTPUT -m mark --mark $sliver_nid -j MARK --set-mark $temp_nid
iptables -t nat -A POSTROUTING -o $PPP_INT -j SNAT --to-source $ppp_addr
iptables -t mangle -I POSTROUTING 1 -m mark --mark $temp_nid -j MARK --set-mark $sliver_nid