ipv6nr-checker.sh

#!/bin/vbash

# If IPv6 is working - exit.
/bin/ping6 -c 2 -n google.com > /dev/null
if [ $? == 0 ]; then
  echo "IPv6 working."
  exit 0;
fi

# If we have no working IPv4 connection - exit.
/bin/ping -c 2 -n google.com > /dev/null
if [ $? != 0 ]; then
  echo "IPv4 seems down - exiting."
  exit 1;
fi

echo "Starting config of IPv6rd"

source /opt/vyatta/etc/functions/script-template

# Get our external IPv4 address (not sure why this can't be read from the interface config, *shrug*).
IP4=$(curl -s ipv4.icanhazip.com)
if ! [[ $IP4 =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
  exit;
fi

# Change v4->v6rd address.
IP6=$(printf "2602:%02x:%02x%02x:%02x00\n" $(echo $IP4 | tr . ' '))

configure

# Delete old IPv6RD configs, otherwise they just stack up.
for addr in $(show interfaces ethernet eth2 vif 2 address | grep 2602 | awk '{print $2}'); do
  delete interfaces ethernet eth2 vif 2 address $addr;
done
for addr in $(show interfaces tunnel tun0 address | grep 2602 | awk '{print $2}'); do
  delete interfaces tunnel tun0 address $addr;
done
delete interfaces ethernet eth2 vif 2 ipv6

# It's easier to just delete + recreate the IPv6RD interface than trying to edit an existing one.
set interfaces tunnel tun0 6rd-prefix "2602::/24"
set interfaces tunnel tun0 address "$IP6::1/24"
set interfaces tunnel tun0 description "CenturyLink IPv6 6rd tunnel"
set interfaces tunnel tun0 encapsulation sit
set interfaces tunnel tun0 local-ip "$IP4"
set interfaces tunnel tun0 mtu 1472
set interfaces tunnel tun0 multicast disable
set interfaces tunnel tun0 ttl 255
set protocols static route6 '::/0' next-hop '::205.171.2.64' interface tun0
set interfaces ethernet eth2 vif 2 address "$IP6::1/64"
set interfaces ethernet eth2 vif 2 ipv6 dup-addr-detect-transmits 1
set interfaces ethernet eth2 vif 2 ipv6 router-advert cur-hop-limit 64
set interfaces ethernet eth2 vif 2 ipv6 router-advert link-mtu 1472
set interfaces ethernet eth2 vif 2 ipv6 router-advert managed-flag false
set interfaces ethernet eth2 vif 2 ipv6 router-advert max-interval 300
set interfaces ethernet eth2 vif 2 ipv6 router-advert other-config-flag false
set interfaces ethernet eth2 vif 2 ipv6 router-advert prefix "$IP6::/64" autonomous-flag true
set interfaces ethernet eth2 vif 2 ipv6 router-advert prefix "$IP6::/64" on-link-flag true
set interfaces ethernet eth2 vif 2 ipv6 router-advert prefix "$IP6::/64" valid-lifetime 2592000
set interfaces ethernet eth2 vif 2 ipv6 router-advert reachable-time 0
set interfaces ethernet eth2 vif 2 ipv6 router-advert retrans-timer 0
set interfaces ethernet eth2 vif 2 ipv6 router-advert send-advert true
commit
save

# If you don't do this, unionfs mounts will OOM your box.
configure_exit