ping & ping6

Question 1

ping

Answer 1

ping uses the ICMP protocol’s mandatory ECHO_REQUEST datagram to elicit an ICMP ECHO_RESPONSE from a host or gateway.

Question 2

ping

• 4, IPv4 only.
• 6, IPv6 only.
• a, Audible ping.
• A, Adaptive ping.
• b, Allow broadcast addr pinging.
• B, Do not allow ping to change source addr of probes.

Answer 2

• d, Set the SO_DEBUG option.
• D, Print timestamp
• f, FLood ping.
• L Suppress loopback of multicast packets.
• n, Numeric output only.
• O, Report outstanding ICMP ECHO reply.
• q, Quiet output.

Question 3

ping

• r, Bypass the normal routing tables and send direct to host.
• R, Ping only, record route.
• U, Print full user to user latency.
• v, Verbose
• V, Version

Answer 3

• c count, Stop after sending count ECHO_REQUEST packets.
• F flow label, IPv6 only, Allocate and set 20bit flow label on echo requests.
• i interval, Wait interval seconds between sending each packet.
• I interface, interface is either an address or an interface name. Sets the Source address or name depending on interface.
• l preload, Ping sends that many packets not waiting for reply.
• m mark, mark tags packets going out.

Question 4

ping

• M pmtudisc_opt, Select a Path MTU Discorvery strategy. It can be: do, want, or dont.
• N nodeinfo_option, Sends ICMPv6 Node Information Queries: help, name, ipv6, ipv6-[global, sitelocal, linklocal, all], ipv4, ipv4-all, subject-ipv6=ipv6addr, subject-ipv4=ipv4addr, subject-name=nodename, subject-fqdn=nodename.
• p pattern, You can specify 16padbytes to fill out the packet you send.

Answer 4

• Q tos, Set Quality of Service.
• s packetsize, Specifies the number of data bytes to be sent.
• S sndbuf, Set sock sndbuf.
• t ttl, Set the time to live.
• T timestamp option, Set special IP timestamp options.
• w deadline, Specify a timeout before ping exits.
• W timeout, Time to wait for a response.