config ip6ip tunnel over gre over udp

#!/bin/bash

ip fou add port 6666 gue
ip link add sit01 type sit remote 198.23.236.232 local 172.31.1.30 ttl 64 encap gue encap-sport  41966 encap-dport 5555 encap-csum encap-rcsum 
ip -6 address add 3ffe:6::1/96 dev sit01
ip -6 route add default dev sit01

sysctl -w net.ipv4.ip_unprivileged_port_start=50
./udp_ixd -x 0 53