Menu
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.
940
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.
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.
UDP header is an 8-bytes fixed and simple header, while for TCP it may vary from 20 bytes to 60 bytes.
The maximum size of a TCP packet is 64K (65535 bytes). Generally, the packet size gets restricted by the Maximum Transmission Unit (MTU) of network resources. MTU is the maximum size of the data transfer limit set by hardware in a network. The packet size should never exceed MTU.
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
165
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
