- interval: the host will be pinged every "interval" seconds.
- ping-protocol: indicates which protocol to use to ping the destination host,
the currently supported protocols are TCP (tcp, tcp_ipv6) and ICMP (icmp, icmpv6).
- This configuration can be used to perform a protocol fallback, in which N pings
- are performed with one protocol, and then after those N attempts, a second protocol
- is used. For example, with the given configuration:
- ping-protocol=ICMPv6,42,ICMP
- the program will ping a host 42 times using the ICMP over IPv6, and then it will
- use the ICMP over IPv4 after those 42 attempts.