The Ping.exe command-line tool for Windows Server 2008 and Windows Vista is the primary network tool for troubleshooting IP connectivity. The Ping tool tests reachability, name resolution, source routing, network latency, and other issues for both IP version 4 (IPv4) and IP version 6 (IPv6). For IPv4, Ping sends an ICMP Echo message to a specified destination and records the round-trip time, the number of bytes sent, and the corresponding Echo Reply’s TTL. When Ping finishes sending ICMP Echo messages, it displays statistics on the average number of replies and round-trip time. For IPv6, Ping works the same way and performs the same functions only using Internet Control Message Protocol version 6 (ICMPv6) Echo Request messages.