Solution: VLAN Trunking

We can run all virtual LANs into our Linux machine via a VLAN "trunk". We then put an IPv6 address on each network, and enable IPv6 routing. We will also need tools to allow creation of VLAN interfaces on the fly.

$ apt-get install vlan
$ modprobe 8021q

We then use "vconfig" to create VLAN interfaces as required.

$ vconfig add eth0 2
Added VLAN with VID == 2 to IF -:eth0:-

So now, we have the following output from ifconfig:

$ ifconfig eth0.2
eth0.2    Link encap:Ethernet  HWaddr 00:00:F8:07:8E:A2  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:800 (800.0 b)  TX bytes:0 (0.0 b)