MTU: Difference between revisions
Content deleted Content added
| Line 96: | Line 96: | ||
Explanation: |
==Explanation:== |
||
'''-c1''' In these examples, we've only used a count of one ping using the -c option. |
'''-c1''' In these examples, we've only used a count of one ping using the -c option. |
||
| Line 102: | Line 102: | ||
'''-M do''' Use the path discovery options to ping. The option is -M. See the man page for all the options. |
'''-M do''' Use the path discovery options to ping. The option is -M. See the man page for all the options. |
||
''' -s 1472''' When setting size in ping, the size is the payload size - not the full packet size. The full packet size is <syntaxhighlight inline> payload + |
''' -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! |
||
Note: ping is slightly different on different operating systems, the above is a Debian machine. |
Note: ping is slightly different on different operating systems, the above is a Debian machine. |
||
| Line 123: | Line 123: | ||
rtt min/avg/max/mdev = 12.491/12.491/12.491/0.000 ms |
rtt min/avg/max/mdev = 12.491/12.491/12.491/0.000 ms |
||
So, here we see '''1480''' bytes received. 1480 plus 20 bytes for the IP header and 8 bytes for the ICMP header is a '''1500''' byte MTU! |
|||
Checking if you have smaller than 1500 MTU: |
Checking if you have smaller than 1500 MTU: |
||