Ethernet

Everything starts with the biggest dump truck: the Ethernet frame. The packet format for Ethernet is

Destination Host Address

6 bytes

Source Host Address

6 bytes

Frame Type

2 bytes

Payload

1500 bytes

The destination address, as you will see momentarily, can be a specific MAC address or a broadcast address. MAC addresses are usually formatted as six colon -delimited bytes. Each byte spans the full 8-bit range of 0255, and the values are typically represented with ASCII-coded hexadecimal. For example, a valid Ethernet MAC address is 00:60:1D:02:08:B5. Notice that each packet received contains the MAC address of the sender (source).



Embedded Systems Firmware Demystified
Embedded Systems Firmware Demystified (With CD-ROM)
ISBN: 1578200997
EAN: 2147483647
Year: 2002
Pages: 118
Authors: Ed Sutter

flylib.com © 2008-2017.
If you may any questions please contact us: flylib@qtcs.net