Consider the two devices:
A: PC, NIC MTU is set to 1500
B: Router, MTU of relevant interface is 1478
A sends a frame of length
B, something might go wrong. But what if I set
A 's MTU to 1400? Now
B should be OK, what will happen when
B sends a frame of length
MTU setting of
A should drop a frame longer than
1400, But since
1400 is a manually set value,
A's NIC is capable of processing frames of length
This post suggests
MTU is the Maximum Transmission Unit, the largest packet of data that a computer interface will send.
MTU only affects sending. Therefore,
A will accept frame of length
1478 even if its MTU is set to
the maximum transmission unit (MTU) is the size of the largest protocol data unit (PDU) that can be communicated in a single network layer transaction
that can be communicated means '''A''' should reject frame of
1478 since it is not valid at all.
Here is my question: Does MTU setting affect sending, receiving, or both?