WIP: Adding information on radv configuration

docs/radv.md

@@ -3,4 +3,66 @@ Radv
 
 Radv or _Router advertisements_ is a feature Bird offers that can allow you to add an additional configuration to your Bird router such that you
 can have it automatically configure your host devices on your CRXN /48 LAN such that they can access the LAN, the greater CRXN and also possibly
-configure [CRXN DNS]() too!
+configure [CRXN DNS]() too!
+
+---
+
+# General syntax
+
+You will want to add one of these to one of your Bird configuration files:
+
+```
+protocol radv
+{
+    # Stuff hoes here
+}
+```
+
+## Advertising your prefix
+
+If you would like to advertise your prefix to hosts on your LAN that have set their address acquisition for IPv6 to _'Automatic'_ such that they will assign themselves an address within that prefix then you will want to add a `prefix` block as so:
+
+```
+protocol radv
+{
+    # Advertise your prefix
+    prefix fd40:ec65:5b4c::/64 {
+        # TODO: Add anything that needs to be in here
+    };
+
+    # Interfaces to run radv on
+    interface "eth0";
+
+}
+```
+
+In the above example I am advertising a `/64` within my `/48`/ULA (`fd40:ec65:5b4c::/48`), `fd40:ec65:5b4c::/64`, and only on interface `eth0` will radv run.
+
+## Advertising route(s)
+
+You can advertise a default route, to `fd00::/8` or simply all routes in your router's routing table, to your hosts using the following:
+
+### Advertising a single `fd00::/8`
+
+TODO: Add this as I normally don't do this even though one should as it means less memory consumption and advertisement updates
+
+### Advertising all known routes
+
+This will advertise all the routes your Bird router knows (those in the `crxn` table) such that your, laptop for example, will add all of them to its routing table.
+
+```
+protocol radv
+{
+    # Advertise your prefix
+    prefix fd40:ec65:5b4c::/64 {
+        # TODO: Add anything that needs to be in here
+    };
+
+    # Interfaces to run radv on
+    interface "eth0";
+
+    # Advertise all routes (TODO: check if this is the correct syntax)
+    propagate_routes yes;
+    table crxn;
+}
+```