-----                              |  -----                                             
       (2102::/64) L1b ---|R1b|----|                         |--|R2b|----------- L2b (2202::/64)                  
                          -----    |                         |  -----                                             
                          -----    |                         |  -----                                             
       (2101::/64) L1a ---|R1a|--| | (2100:b::/64)           |--|R2a|----------- L2a (2201::/64)                  
                          -----  | |                         |  -----                                             
                                 | |                         |                                                    
                   (2100:a::/64) | |          L2 (2200::/64) |                                                    
                                 | |                         |                                                    
                               --|-|-                     ---|--  L3a (2301::/64) -----     L3 (2300::/64)        
                               | HA |                     | R2 |------------------|HA2|--------------------       
                               --|---                     ---|--                  -----                           
                         ________|___________________________|_________                                           
                                   L0 (2000::/64) -Home Link-                                                     
                                                                                                                  
Notes:                                                                                                            
2100:a:: and 2100:b:: links are tunnels 6-over-4.                                                                 
L1a, L1b, and L2b links are either wired or wireless links (R1a, R1b and R2b are Linksys WRT54GS routers)