Posted By

biiont on 02/20/14


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ping mtu


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Determining MTU With Ping


 / Published in: Bash
 

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).

  1. ping -A -c 3 -M do -s 1472 google.com
  2. ping -A -c 3 -M do -s 1473 google.com

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