v6pup.sh

#!/bin/sh

BR='BRのIPv6アドレス'
CE='CEのIPv6アドレス'
IP4='IPv4アドレス'
PSID='ポートセットID'
WANDEV='eth1'
TUNDEV='ip6tnl1'
ip -6 addr add $CE dev $WANDEV
ip -6 tunnel add $TUNDEV mode ip4ip6 remote $BR local $CE dev $WANDEV
ip link set dev $TUNDEV mtu 1460
ip link set dev $TUNDEV up

route delete default
route add default dev $TUNDEV

iptables -t nat -F

rule=1
while [ $rule -le 15  ] ; do
  mark=`expr $rule + 16`
  pn=`expr $rule - 1`
  portl=`expr $rule \* 4096 + $PSID \* 16`
  portr=`expr $portl + 15`
  iptables -t nat -A PREROUTING -m statistic --mode nth --every 15 --packet $pn -j MARK --set-mark $mark
  iptables -t nat -A OUTPUT -m statistic --mode nth --every 15 --packet $pn -j MARK --set-mark $mark

  iptables -t nat -A POSTROUTING -p icmp -o $TUNDEV -m mark --mark $mark -j SNAT --to $IP4:$portl-$portr
  iptables -t nat -A POSTROUTING -p tcp -o $TUNDEV -m mark --mark $mark -j SNAT --to $IP4:$portl-$portr
  iptables -t nat -A POSTROUTING -p udp -o $TUNDEV -m mark --mark $mark -j SNAT --to $IP4:$portl-$portr
  rule=`expr $rule + 1`
done

iptables -t mangle -o $TUNDEV --insert FORWARD 1 -p tcp --tcp-flags SYN,RST SYN -m tcpmss --mss 1400:65495 -j TCPMSS --clamp-mss-to-pmtu