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Size of empty UDP and TCP packet?

Tags:

tcp

size

udp

What is the size of an empty UDP datagram? And that of an empty TCP packet?

I can only find info about the MTU, but I want to know what is the "base" size of these, in order to estimate bandwidth consumption for protocols on top of them.

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puccio Avatar asked Dec 04 '09 10:12

puccio

People also ask

What is the size of a UDP packet?

The number for the length of a UDP packet is 16 bits wide. This means it can be between 0 and 2^16 - 1, or 0 to 65535.

Is a UDP packet smaller than a TCP packet?

The standard size of a TCP packet has a minimum size of 20 bytes, and a maximum of 60 bytes. The UDP packet consists of only 8 bytes for each packet.

What are the sizes of TCP and UDP headers?

UDP header is an 8-bytes fixed and simple header, while for TCP it may vary from 20 bytes to 60 bytes.

What is TCP packet size?

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1 Answers

TCP:

Size of Ethernet frame - 24 Bytes
Size of IPv4 Header (without any options) - 20 bytes
Size of TCP Header (without any options) - 20 Bytes

Total size of an Ethernet Frame carrying an IP Packet with an empty TCP Segment - 24 + 20 + 20 = 64 bytes

UDP:

Size of Ethernet frame - 24 Bytes
Size of IPv4 Header (without any options) - 20 bytes
Size of UDP header - 8 bytes

Total size of an Ethernet Frame carrying an IP Packet with an empty UDP Datagram - 24 + 20 + 8 = 52 bytes

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Himanshu Avatar answered Sep 20 '22 15:09

Himanshu
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