Home > Others

What is the maximum size of a UDP packet?

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞
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?

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
what maximum of function what is packet tracer what is packet sniffing udp packet loss maximum integer size maximum file size mysql maximum table size

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More