IPv6

check.sh

#!/bin/sh
#
# https://tunnelbroker.net/tunnel_detail.php?tid=$TID

TID=1234567
HEUSER=login
HEPASS=Update_Key_from_Tunnel_Details/Advanced
CHECK_DNS=you.dns.he.dynamically.updated.domain
URL="https://$HEUSER:$HEPASS@ipv4.tunnelbroker.net/nic/update?hostname=$TID"

if
  CURR=$(nc ipv4.test-ipv6.com 79 | grep -Eo '[\.0-9]+$')
  DNSA=$(dig +short -t A $CHECK_DNS @ns1.he.net)
  test x"$CURR" = x"$DNSA"
then
  echo Everything fine.
else
  echo Setting current IPv4 tunnel endpoint to $CURR
  wget -4 -O /dev/null -q "$URL" && echo done
fi

checkloop.sh

#!/bin/sh
#
# nohup /root/checkloop.sh </dev/null >/tmp/checkloop.log 2>&1 &

while
  true
do
  ping6 -qc1 www.google.com >/dev/null || /root/check.sh
  sleep 5
  exec $0
done

dnsmasq.conf

domain-needed
no-resolv
no-poll
no-hosts

address=/.dev/127.0.0.1
server=8.8.8.8
server=8.8.4.4
cache-size=250

# IPv4
#dhcp-range=192.168.0.121, 192.168.0.221, 1w
#dhcp-option=option:router, 192.168.0.253
#dhcp-option=option:ntp-server, 0.0.0.0
#dhcp-option=option:dns-server, 0.0.0.0, 8.8.8.8, 8.8.4.4

# IPv6
#enable-ra
#dhcp-range=::100, ::400, constructor:eth0, slaac

interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
 address 192.168.0.120
 netmask 255.255.255.0
 gateway 192.168.0.253
 mtu 1492

ip6tables.state

# Generated by ip6tables-save v1.4.21 on Sat Dec 26 20:50:33 2015
*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A FORWARD -p tcp -m tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu
COMMIT
# Completed on Sat Dec 26 20:50:33 2015

ipv6-he-linux.sh

#!/bin/sh

devname=he-ipv6
remote=216.66.86.122
PREFIX=2001:470:6e:633:
PREFIX_NET=2001:470:6f:633:
MYIPV6=$PREFIX:2/64
MTU=1460

modprobe ipv6
sysctl -w net.ipv6.conf.all.disable_ipv6=0

test "$1" = "-d" && {
  shift
  sysctl -w net.ipv6.conf.all.disable_ipv6=1
  ip link list | grep -q $devname && ip t d $devname \
    && echo tunnel deleted
  /etc/init.d/radvd stop
  exit
}

ip tunnel delete $devname
routedev=`ip -4 route show | sed -n 's/.*default via \([0-9\.]\+\) dev \([a-z0-9]\+\) .*/\2/p'`

local=`ip -4 r show | sed -n "/dev $routedev/s/.* src \([0-9\.]\+\) .*/\1/p" | sed 1q`
echo $local

/root/check.sh

sysctl -w net.ipv6.conf.all.forwarding=0
sysctl -w net.ipv4.ip_forward=0
test "$1" = "-e" && exit

ip link list | grep -q $devname || {
	ip tunnel add $devname mode sit \
		remote $remote \
		local $local \
		ttl 255
}
ip link set $devname up mtu $MTU
ip addr add $MYIPV6 dev $devname
ip route add ::/0 dev $devname
ip -f inet6 addr

ip address add $PREFIX_NET:1/64 dev $routedev
ip6tables-restore < /root/ip6tables.state
sysctl -w net.ipv4.ip_forward=1
sysctl -w net.ipv6.conf.all.forwarding=1
#/etc/init.d/radvd restart

radvd.conf

interface eth0
{
        AdvSendAdvert on;
        AdvHomeAgentFlag off;

        prefix ::/64
        {
                AdvOnLink on;
                AdvAutonomous on;
                AdvRouterAddr off;
        };
};

rc.local

ip -6 a a 2a00:1028:8b40:3d5a::fec0/64 dev eth0
ip -6 r a default via fe80::1 dev eth0 mtu 1492

#echo Setting up IPv6
#/root/ipv6-he.sh -ra
#nohup /root/checkloop.sh </dev/null >/tmp/checkloop.log 2>&1 &

ls -l /var/cache/apt

lrwxrwxrwx 1 root root 8 Jan 3 09:47 /var/cache/apt -> /tmp/apt