Send an echo request to a foreign node (remote host) to determine whether the node is accessible:
>>-ping--+-+------------+-- host_name-+------------------------>< | '-| Option |-' | +- -h------------------------+ '- -?------------------------' Option .---------------------. V | |----+-----------------+-+--------------------------------------| +- -A-+-ipv4-+----+ | '-ipv6-' | | .-1----. | +- -c-+------+----+ | '-echo-' | +- -i interface---+ | .-256---. | +- -l-+-------+---+ | '-bytes-' | +- -n-------------+ +- -P-+-yes----+--+ | '-ignore-' | +- -p tcpname-----+ +- -s srcip-------+ | .-10------. | +- -t-+---------+-+ | '-seconds-' | '- -v-------------'