Ip Addresses - Watchguard Firebox X20E User Manual

order. To make sure that the packets get to the destination, address information is added to the pack-
ets.
The TCP and IP protocols are used to send and receive these packets. TCP disassembles the data and
assembles it again. IP adds information to the packets, such as the sender, the recipient, and any spe-
cial instructions.

IP Addresses

To send ordinary mail to a person, you must first know his or her street address. For one computer to
send data to a different computer, it must first know the address of that computer. A computer address
is known as an IP address. Only one device can use an IP address at a time.
An IPv4 address is commonly referred to in dotted decimal format contained within four octets, sepa-
rated by periods. Some examples of IP addresses are:
192.168.0.11
•
10.1.20.18
•
208.15.15.15
•
User Guide
Data packet
Packets traveling on the Internet
IP Addresses
3