MTU: Difference between revisions

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For example:

Linux

ping -c1 -M do -s 1472 81.187.81.187

On OSX (Apple):

ping -c1 -D -s 1472 81.187.81.187

Windows:

ping -n 1 -f -l 1472 81.187.81.187

^^ That's the ping command to remember. The rest of this section is a bit of info about that command.

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==Explanation:==

'''-c1''' In these examples, we've only used a count of one ping using the -c option.

'''-c1 / -n 1''' In these examples, we've only used a count of one ping using the -c option or -n on Windows.

'''-M do / -f''' Means don't fragment the ping packet

'''-M do''' Use the path discovery options to ping. The option is -M. See the man page for all the options.

''' -s 1472''' The option for payload size is -s. When setting size in ping, the size printed is the payload size - not the full packet size. '''The full packet size is''' <syntaxhighlight inline> payload (1472) + IP header (20) + ICMP header (8) </syntaxhighlight>, so this is 1500 in total!

''' -s 1472 / -l 1472''' The option for payload size is -s, or -l on Windows. When setting size in ping, the size printed is the payload size - not the full packet size. '''The full packet size is''' <syntaxhighlight inline> payload (1472) + IP header (20) + ICMP header (8) </syntaxhighlight>, so this is 1500 in total!

Note: ping is slightly different on different operating systems, the above is a Debian machine.