Zen UK IPv6 Instructions (#11)

source/manual/IPv6_ZenUK.rst

@@ -0,0 +1,213 @@
+**IPv6 For Zen UK**
+===================
+
+**Original Author:** Martin Wasley
+
+**Introduction**
+-----------------
+Zen provide two methods of setting up IPv6.
+
+The first method is a simple DHCP method which should suffice most
+users, the second allows you to set up static IPv6 on both WAN and LAN.
+In either case the addresses and prefixes are constant and even under
+DHCP will not change. Currently Zen provide a /64 WAN address and a /48
+prefix allocation. These will have been given to you by Zen when you
+request IPv6.
+
+**Setting up IPv6 using DHCPv6**
+--------------------------------
+
+
+**WAN Interface**
+-----------------
+
+Zen use PPPoE in the initial V4 connection, so enter PPPoE as the V4
+connection type and set the username and password for the PPPoE
+connection, for IPv6 using DHCP, select DHCPv6 in the IPv6 connection as
+shown below.
+
+.. image:: images/ZenUK_image0.png
+	:scale: 100%
+
+The next step is to configure the parameters required for DHCPv6, these
+are located in the DHCPv6 client configuration section of the WAN
+interface shown below.
+
+.. image:: images/ZenUK_image1.png
+	:scale: 100%
+
+As stated before, Zen provide a /48 prefix, so select the prefix size
+accordingly. We directly send the solicit as in this case we do not wish
+to wait for an RA from the Zen gateway.
+
+The only other requirement in this section is to select ‘Use IPv4
+connectivity’, this is because the IPv6 traffic is routed over the PPPoE
+link.
+
+In the example above, ‘Enable debug’ is selected, this adds extra dhcp6c
+logging information to the dhcpd logs, this is optional.
+
+Click ‘Save’ and then ‘Apply’.
+
+**LAN Interface**
+-----------------
+
+All that is required now is to set the LAN interface to use assigned
+IPv6 prefix.
+
+Select Interfaces->LAN and set the IPv6 Configuration Type to ‘Track
+Interface’
+
+.. image:: images/ZenUK_image2.png
+	:scale: 100%
+
+Finally, set the Track IPv6 Interface to WAN, unless there is a special
+requirement which this document does not cover, set the IPv6 Prefix ID
+to 0.
+
+.. image:: images/ZenUK_image3.png
+	:scale: 100%
+
+Click ‘Save’ and then ‘Apply’.
+
+It is advisable at this point to reboot the system.
+
+**Setting up IPv6 using Static Assignment**
+-------------------------------------------
+
+Although slightly more complex, this option gives you greater control
+over LAN DHCP6 server, as this can be tailored to specific needs.
+
+We can take advantage of the link-local that is automatically set up
+between our router and the Zen BNG, we do not need to know specific
+gateways at the Zen end, it all gets routed automagically, however we do
+need to set up all of our static assignments, and our DHCPv6/RADVD
+servers.
+
+
+**Create Gateway**
+------------------
+Firstly, we do need to set up a gateway, this is for monitoring more
+than anything else. Select Gateways->All then click ‘Add Gateway’.
+
+Now, we know that Zen give us a /64 on our WAN interface, for example.
+
+2a02:8231:d256:318::/66
+
+Pick an address, we’ll use ‘1’, so our WAN address
+2a02:8231:d256:318::1, it’s also going to be our gateway.
+
+We will also add a target IP for our monitor, the target will be a
+global WAN address of something. You can use the Google v6 DNS server
+address if you wish. If no monitor is given the gateway address is used, 
+which can check gateway health status but may or may not indicate access
+to the Internet.
+
+Set up the gateway like this:
+
+
+.. image:: images/ZenUK_image4.png
+	:scale: 100%
+
+Click Save.
+
+**WAN Interface**
+-----------------
+Once we have our gateway in place we can then set up the WAN interface.
+Select Interfaces->WAN.
+
+Go to IPv6 Configuration Type and Select Static IPv6.
+
+.. image:: images/ZenUK_image5.png
+	:scale: 100%
+
+Go to Static IPv6 Configuration and set the IPv6 Static address:
+
+**Tip Use the same address as found when setting the system up to use
+DHCPv6.**
+
+.. image:: images/ZenUK_image6.png
+	:scale: 100%
+
+Select Use IPv4 connectivity, all IPv6 traffic goes via the PPPoE link.
+
+Finally, select the IPv6 Upstream Gateway, this is the gateway you
+created earlier.
+
+.. image:: images/ZenUK_image7.png
+	:scale: 100%
+
+Click Save and Apply.
+
+**LAN Interface**
+-----------------
+
+The LAN interface is very simple to set up, all we need to do is set the
+IPv6 Configuration Type to Static, and enter our static address.
+
+.. image:: images/ZenUK_image8.png
+	:scale: 100%
+
+Zen give us a /48 prefix to use on the LAN, so pick an address from that
+range. For example our prefix is:
+
+2a02:8242:55AB::
+
+So
+
+2a02:8242:55AB:0:4:3:2:1 would suffice.
+
+.. image:: images/ZenUK_image9.png
+	:scale: 100%
+
+We want to use a /64 prefix on this interface.
+
+**Tip Use the same address as found when setting the system up to use
+DHCPv6.**
+
+Click Save and Apply.
+
+**DHCPv6 Server**
+-----------------
+
+When using DHCPv6 on the WAN, our DHCPv6 LAN server is set
+automatically, however when using statics, we need to set it up. Goto
+Services->DHCPv6[LAN]
+
+Firstly, enable the server.
+
+.. image:: images/ZenUK_image10.png
+	:scale: 100%
+
+You will notice that the subnet already has a range, and the subnet mask
+is the /64 we set on the LAN. There is also a range we must use, the
+available range tells us what that can be.
+
+Enter the lower – start range that the server will use
+
+2a02:8231:d256::eeee:0000:0000:0001
+
+Enter the upper – end range that the server will use.
+
+2a02:8231:d256::eeee:ffff:ffff:ffff
+
+.. image:: images/ZenUK_image11.png
+	:scale: 100%
+
+This should cover most LAN subnets, the range given here gives
+281,474.976.710,655 addresses.
+
+We can also set up a prefix delegation range, this is used where we have
+sub routers or VLAN’s that need their own range. In the case of
+prefixes, we are only interested in the upper 64 bits, as in this
+example we will only be giving out 64 bit prefixes. We know we have been
+given a /48 prefix by Zen, so we enter our prefix range like this:
+
+.. image:: images/ZenUK_image12.png
+	:scale: 100%
+
+Our prefix range is the upper 48 bits, plus some of the next 16 bits,
+but we must not cross into the range we have used for our LAN addresses.
+In the example above I have allowed for up to 254 /64 subnets.
+
+Once these details have been entered, click save.