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  • ping -- send ICMP ECHO_REQUEST packets to network hosts

    ping [-Rdfnqrv] [-c count] [-i wait] [-l preload] [-p pattern]
              [-s packetsize] host
    Ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to elicit
         an ICMP ECHO_RESPONSE from a host or gateway.  ECHO_REQUEST datagrams
         (``pings'') have an IP and ICMP header, followed by a ``struct timeval''
         and then an arbitrary number of ``pad'' bytes used to fill out the
         packet.  The options are as follows:
  • dig - DNS lookup utility

    dig [@server] [-b address] [-c class] [-f filename] [-k filename] [-m]
               [-p port#] [-q name] [-t type] [-x addr] [-y [hmac:]name:key] [-4]
               [-6] [name] [type] [class] [queryopt...]
    
           dig [-h]
    dig (domain information groper) is a flexible tool for interrogating
           DNS name servers. It performs DNS lookups and displays the answers that
           are returned from the name server(s) that were queried. Most DNS
           administrators use dig to troubleshoot DNS problems because of its
           flexibility, ease of use and clarity of output. Other lookup tools tend

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