# Wiki source code of Enable 6rd support

Last modified by Jean Franco on 2022/06/23 22:09
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author | version | line-number | content
--- | --- | --- | ---
|  | 1 | 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.
|  | 2 |
|  | 3 | 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.
|  | 4 |
|  | 5 | CL customers can figure out their assigned IPv6 prefix with the following command:
|  | 6 |
|  | 7 | {{{ echo $(printf "2602:%02x:%02x%02x:%02x00::1\n" $(echo $YOUR-PUBLIC-IP-ADDRESS | tr . ' '))}}}
|  | 8 |
|  | 9 | Replace $YOUR-PUBLIC-IP-ADDRESS with the public facing address on your ER. You'll get an IP in the form of:
|  | 10 |
|  | 11 | {{{ 2602:xx:xxxx:xxxx::1}}}
|  | 12 |
|  | 13 | Configure your tunnel like so:
|  | 14 |
|  | 15 | {{{ set interfaces tunnel tun0 6rd-prefix '2602::/24'
|  | 16 | set interfaces tunnel tun0 address '2602:xx:xxxx:xxxx::1/24'
|  | 17 | set interfaces tunnel tun0 description 'CenturyLink IPv6 6rd tunnel'
|  | 18 | set interfaces tunnel tun0 encapsulation sit
|  | 19 | set interfaces tunnel tun0 local-ip $YOUR-PUBLIC-IP-ADDRESS
|  | 20 | set interfaces tunnel tun0 mtu 1472
|  | 21 | set interfaces tunnel tun0 multicast disable
|  | 22 | set interfaces tunnel tun0 ttl 255}}}
|  | 23 |
|  | 24 | If you are running pre-1.8 firmware, you will need to use the following:
|  | 25 |
|  | 26 | {{{ set protocols static route6 '::/0' next-hop '::205.171.2.64' interface tun0}}}
|  | 27 |
|  | 28 | If you are running 1.8 or later, use the following instead:
|  | 29 |
|  | 30 | {{{ set interfaces tunnel tun0 6rd-default-gw ::205.171.2.64}}}
|  | 31 |
|  | 32 | 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.
|  | 33 |
|  | 34 | {{{ set interfaces ethernet eth1 address '2602:xx:xxxx:xxxx::1/64'
|  | 35 | set interfaces ethernet eth1 ipv6 dup-addr-detect-transmits 1
|  | 36 | set interfaces ethernet eth1 ipv6 router-advert cur-hop-limit 64
|  | 37 | set interfaces ethernet eth1 ipv6 router-advert link-mtu 1472
|  | 38 | set interfaces ethernet eth1 ipv6 router-advert managed-flag false
|  | 39 | set interfaces ethernet eth1 ipv6 router-advert max-interval 300
|  | 40 | set interfaces ethernet eth1 ipv6 router-advert other-config-flag false
|  | 41 | set interfaces ethernet eth1 ipv6 router-advert prefix '2602:xx:xxxx:xxxx::/64' autonomous-flag true
|  | 42 | set interfaces ethernet eth1 ipv6 router-advert prefix '2602:xx:xxxx:xxxx::/64' on-link-flag true
|  | 43 | set interfaces ethernet eth1 ipv6 router-advert prefix '2602:xx:xxxx:xxxx::/64' valid-lifetime 2592000
|  | 44 | set interfaces ethernet eth1 ipv6 router-advert reachable-time 0
|  | 45 | set interfaces ethernet eth1 ipv6 router-advert retrans-timer 0
|  | 46 | set interfaces ethernet eth1 ipv6 router-advert send-advert true}}}
|  | 47 |
|  | 48 | Congrats, you should now have functioning IPv6 over 6rd from CL! Feel free to adapt these to your own provider's setup.

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