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New Member

UDP

Hi there! I hope someone is kind enough to help me with the following query:

I've read in a book that User Datagram Protocol does not segment the data. Is this true? I find this odd because if that's the case, does UDP send all data in one big chunk? Furthermore in a previous edition of this same book by the same author, he mentions that UDP does indeed segment data. I will be most grateful if someone can clear up this confusion.

Thank you in advance.

Best wishes,

Ashraf.

  • Getting Started with LANs
1 ACCEPTED SOLUTION

Accepted Solutions
New Member

Re: UDP

Hi, The UDP protocol does not garantee delivery of data, with that said UDP does provide check sum. Yes it does segment data if I remember correctly the MTU is 1500bytes. UDP receives data from the application process attatches destination and source port numbers fields, add additional needed fields and passed the SEGMENT to the network layler. Have a look at the link below.

http://www-net.cs.umass.edu/kurose/transport/UDP.html

http://www.networksorcery.com/enp/protocol/udp.htm

4 REPLIES
New Member

Re: UDP

Hi, The UDP protocol does not garantee delivery of data, with that said UDP does provide check sum. Yes it does segment data if I remember correctly the MTU is 1500bytes. UDP receives data from the application process attatches destination and source port numbers fields, add additional needed fields and passed the SEGMENT to the network layler. Have a look at the link below.

http://www-net.cs.umass.edu/kurose/transport/UDP.html

http://www.networksorcery.com/enp/protocol/udp.htm

New Member

Re: UDP

Thank you very much for your help. I appreciate it very much.

Re: UDP

Whether TCP or UDP, they have to be encapsulated & send as IP datagram. IP has the ability to fragment packets based on the mtu configured.

New Member

Re: UDP

Unless of course the DF bit is set. However, if the DF bit is set and the datagram is too large to traverse a part of the network an ICMP message will be sent back to the sending station informing that "fragmentation is needed but DF is set".

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