demonstrations, ensuring that DoD interoperability and migration objectives are identified and demonstrated. The Moonv6 network is a set of native IPv6 connections between sites on the global Internet that forward packets to other Moonv6 peering sites. Participants can have a native IPv6 connection to the Internet, and Moonv6 permits IPv6-in-IPv4 Chapter 8 The Internet and IP Infrastructures tunnel hops for a 90-day period to test on the Moonv6 network, provided that the requestor, not Moonv6 administration, defines and administers those tunnels. A Moonv6 site forwards packets within the Moonv6 peering network and also partici- pates as a Moonv6 site for collaborative testing of IPv6 implementations for interop- erability and verification of functions within the IPv6 protocol and architecture. To become a Moonv6 peering network, a network must be an IPv6 peer with an exist- ing Moonv6 peering network. To become a Moonv6 site, one must connect to an existing Moonv6 peering network. DNS is a distributed database system that operates on the basis of a hierarchy of names. DNS provides translation between host names (such as www.lidoorg.com or www.telecomwebcentral.com and the difficult-to-remember numeric IP addresses. It identifies a domain's mail servers and a domain's name servers. When you need to contact a particular URL, the host name portion of the URL must be resolved to the appropriate IP address (see Figure 8.18). Local Loop (Local loop alternatives: Root Servers n = 13 analog dialup, ISDN, xDSL, HFC and cable (ICANN) modem, broadband wireless, FTTH, PON) ISP POP T-/E-/J-Carrier, Web Browser OC Levels Transport 1 Browser sends URL to request IP address 2 If not on local name Internet server, root domain Backbone Local servers are contacted Server 3 The root domain server responds with TLD name server containing the info TLD Name 4 Local name server cantacts Servers TLD, which contains the primary and secondary name server Local 5 Name server returns IP 5 TLD server sends info address to your computer 6 Usin