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October 1, 2015 08:20
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Determining MTU With Ping
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| # This script allows to determine MaxTranssmitUnit size for current network. | |
| # | |
| # Argument "-M" selects Path MTU Discovery strategy: - "do" means prohibit | |
| # fragmentation, even local one; - "want" do PMTU discovery, fragment locally | |
| # when packet size is large; - "dont" do not set DF flag. | |
| # | |
| # Argument "-s" specifies payload size. Value 1472 produces frames of 1500 bytes. | |
| # And value 1473 is for frames 1501 byte which is more than usual MTU. | |
| # | |
| # Arguments "-c 3 -A" are used to send 3 packets as fast as possible (adaptive ping). | |
| ping -A -c 3 -M do -s 1472 google.com | |
| ping -A -c 3 -M do -s 1473 google.com |
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Ping www.google.com -f -l 1500