When a ping command is issued, the utility sends an ICMP Echo Request to a destination IP address. Try pinging the IP address of the target host to see if it responds. If that succeeds, try pinging the target host using a host name. Ping first attempts to resolve the name to an address through a DNS server, then a WINS server (if one is configured), then attempts a local broadcast. When using DNS for name resolution, if the name entered is not a fully qualified domain name, the DNS name resolver appends the computer's domain name or names to generate a fully qualified domain name.
If pinging by address succeeds but pinging by name fails, the problem usually lies in name resolution, not network connectivity. Note that name resolution might fail if you do not use a fully qualified domain name for a remote name. These requests fail because the DNS name resolver is appending the local domain suffixes to a name that resides elsewhere in the domain hierarchy.