How to determine what MTU size from your networking

Zyxel_Kevin
Posts: 944
Zyxel Employee





in Other Topics
First of all you may know ICMP header is 28 bytes.
Then using ICMP with Don't Fragmented parameter to find your network MTU.
Here is example for Macbook command:
The icmp request can not be sent while length exceed 1473 byte, the message said "Message too long"
Which means the exact MTU size is 1472+28(icmp header) = 1500
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