During the lab, one must look forward for ipv6 addresses for testing purposes. Tunnel Broker is the organisation which is providing free of cost tunnelling and bgp peering with them. Only need to provide the ipv4 address incase of tunnel and as number incase if bgp peering. Once its done, global ipv6 cloud is reachable free of cost. After creating ipv6 session, telnet to route-server.he.net and look for the show ipv6 route or show ipv6 bgp. Now ping ip addresses found in route server from your ipv6 tunnel router.