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The information on the internet and other networks is sent grouped in data packets. MTU (Maximum Transmission Unit) is the maximum amount of data that can be physically transmitted in a packet. Windows assigns a default value of MTU to each connection according to its type. However, it is necessary to check in practice if this value works properly in each connection.
If the MTU value set is too high, it can cause fragmentation and loss in the sent packets. Otherwise, if it is lower, the network capacity is not properly utilized. The MTU values assigned by Windows according to the network used are:
Each transmission unit consists of headers or headers plus the data used. The data referred to as MSS (Maximum Segment Size), truly define the information to be sent, so the formula would be: MTU = MSS + TCP & IP headers.
ping [-f] [-l
] [host] ping -f -l 1500 google.com
If result = Packet needs to be fragmented but DF set. You have to try until you fragment the package:
ping -f -l 1480 google.com Packet needs to be fragmented but DF set ....
ping -f -l 1460 google.com icmp_seq=0 time=1.883 ms icmp_seq=1 time=3.353 ms
As seen in the last ping there is no fragmentation so it is the correct MTU.Linux
ping [-M do] [-s
] [host] ping -M do -s 1460 google.com
ping [-D] [-s
] [host] ping -D -s 1460 google.com