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How to check the MTU network in wireshark ??

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I have a question, when I use the ping with parametrs "-f" until find the MTU, the max size what I can ping, is 1472, but the size of the fragmenteds packages in Wireshark, is 1500, 1480 data and 20 header. What is the true MTU?

asked 28 Jun '15, 10:23

Igor%20Ramos's gravatar image

Igor Ramos
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One Answer:

2

The MTU size is 1500 and includes 20 bytes IP_header, 8 byte ICMP_header and 1472 bytes ICMP payload.

Regards Matthias

IP Header alt text

ICMP Header alt text

answered 28 Jun '15, 11:53

mrEEde's gravatar image

mrEEde
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accept rate: 20%

edited 28 Jun '15, 11:54

Thank you guy, you helped me a lot. Very good response !!!

(28 Jun '15, 12:16) Igor Ramos