FAQ : Connectivity (Tunnels and Subnets) : How do I give connectivity to other hosts on my subnet?
How do I give connectivity to other hosts on my subnet?
Per default every tunnel has a routed /64, the so-called "Default Subnet". This subnet is routed towards the <tunnel>::2 address and is directly available for connecting hosts on a separate link behind the tunnel. If one has multiple network segments that require a /64 behind the tunnel (eg wired, wireless, DMZ, etc) one will need to request a Full Subnet (/48).
You can find your subnets in your User Home.
The easiest way to use your subnet is to assign a /64 per switch network and then setup a Router Advertisement server. As SixXS serves out a /64 per default (Default Subnet) and a /48 (Full Subnet) on request you either have 1 /64 and in the case of the /48 the possiblity of having 65535 /64's and thus subnets inside your site.
A /48 is an end-site and should thus not be delegated to another administration. In case you want to connect multiple sites under different administration we suggest using multiple tunnels and subnets, unless of course the network is the same. See also the definition of a site below.
In the SixXS system three types of prefixes exist:
Note thus that the user cannot use any other addresses but tunnel::2 for the tunnel prefix.
What is a "site"?
A site is defined as a network with one single administration. The moment a change occurs in administration, one is in a different site. Thus if you have one network operated by administration group X and another network operated by admin Y then those are two sites. Of course, when group X and Y, both administratively fall under group A, they can still be taken as to be a single site.
Operating System configuration
Under Linux the Router Advertisement (RA) server is called radvd, *BSD (KAME stack) calls it rtadvd. Clients can then be configured using RFC 2462 aka "IPv6 Stateless Address Autoconfiguration".
The Wiki contains various details about other Operating Systems and Distributions