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What is the maximum size of a UDP packet?

Source: Internet
Author: User
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What is the maximum size of each UDP packet?
65507 approximately equal to 64K

Why is the maximum 65507?
Because the UDP header has 2 bytes for recording the package body length. 2 bytes can indicate the maximum value is: 2^16-1=64k-1=65535
UDP header accounted for 8 bytes, IP header accounted for 20 bytes, 65535-28 = 65507

What if the UDP message to be sent is greater than 65507?
Need to be sent on the application layer by the developer himself shards. The granularity of the Shard is 65507 bytes maximum. The SendTo function of the system is not supported for single-packet delivery larger than 65507 bytes.


UDP header Format:



The test results are as follows, when the size is 65508 times wrong.

What is the maximum size of a UDP packet?

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Related Keywords:
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