Enable 6rd support

6rd is a mechanism to enable IPv6 tunneling for providers who are unable to provide native IPv6 to their customers. It uses a 6in4 SIT tunnel to work it's magic.

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This is an example of 6rd for CenturyLink customers - you'll need to find out if your provider supports 6rd, and what are the various settings - including 6rd prefix, the ipv4 6rd tunnel server address.

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CL customers can figure out their assigned IPv6 prefix with the following command:

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{{{ echo $(printf "2602:%02x:%02x%02x:%02x00::1\n" $(echo $YOUR-PUBLIC-IP-ADDRESS | tr . ' '))}}}

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Replace $YOUR-PUBLIC-IP-ADDRESS with the public facing address on your ER. You'll get an IP in the form of:

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{{{ 2602:xx:xxxx:xxxx::1}}}

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Configure your tunnel like so:

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{{{ set interfaces tunnel tun0 6rd-prefix '2602::/24'

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set interfaces tunnel tun0 address '2602:xx:xxxx:xxxx::1/24'

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set interfaces tunnel tun0 description 'CenturyLink IPv6 6rd tunnel'

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set interfaces tunnel tun0 encapsulation sit

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set interfaces tunnel tun0 local-ip $YOUR-PUBLIC-IP-ADDRESS

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set interfaces tunnel tun0 mtu 1472

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set interfaces tunnel tun0 multicast disable

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set interfaces tunnel tun0 ttl 255}}}

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If you are running pre-1.8 firmware, you will need to use the following:

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{{{ set protocols static route6 '::/0' next-hop '::205.171.2.64' interface tun0}}}

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If you are running 1.8 or later, use the following instead:

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{{{ set interfaces tunnel tun0 6rd-default-gw ::205.171.2.64}}}

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And configure a range on your LAN side. In this case, we'll be using eth1. For CL business level customers, each public static IP gets assigned a /56. For residential, its a /64. We'll use the first /64 block in the /56 for the LAN.

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{{{ set interfaces ethernet eth1 address '2602:xx:xxxx:xxxx::1/64'

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set interfaces ethernet eth1 ipv6 dup-addr-detect-transmits 1

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set interfaces ethernet eth1 ipv6 router-advert cur-hop-limit 64

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set interfaces ethernet eth1 ipv6 router-advert link-mtu 1472

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set interfaces ethernet eth1 ipv6 router-advert managed-flag false

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