The hosts must be able to communicate with each other. If your
network uses host names, the sending host must be able to resolve the receiving
host’s name to an IP address.
To
accomplish this, you may have to update the hosts file, hosts NIS
map, or Domain Name Service. To verify TCP/IP access, use rcp on each
sending host to copy a file to the receiving hosts or use store-and-forward
to send a packet
Note: If hosts in your network are known only by their IP addresses, you can
use the IP addresses instead of host names, and no resolution is necessary.