Watchguard Firebox X5-W Guía de usuario Pagina 20

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Introduction to Network Security
4 Firebox X Edge e-Series
Network addressing
ISPs (Internet service providers) assign an IP address to each device on their network. The IP address can
be static or dynamic. Each ISP has a small number of IP addresses.
Static IP addresses are permanently assigned to a device. These addresses do not change automatically,
and are frequently used for servers.
Dynamic IP addresses change with time. If a dynamic address is not in use, it can be automatically
assigned to a different device.
Your ISP can tell you how their system assigns IP addresses.
About DHCP
Many ISPs assign dynamic IP addresses through DHCP (Dynamic Host Configuration Protocol). When a
computer connects to the network, a DHCP server at the ISP assigns that computer an IP address. It is
not necessary to assign IP addresses manually when you use DHCP.
About PPPoE
Some ISPs assign their IP addresses through Point-to-Point Protocol over Ethernet (PPPoE). PPPoE
expands a standard dial-up connection to add some of the features of Ethernet and PPP. This system
allows the ISP to use the billing, authentication, and security systems of their dial-up infrastructure with
DSL modem and cable modem products.
Default gateway
A default gateway is a node on a computer network that serves as an access point to another network.
Usually, the default gateway is the IP address of the router that is between your network and the Inter-
net. After you install the Firebox X Edge on your network, the Edge acts as the default gateway for all
computers connected to its trusted or optional interfaces.
Domain Name Service (DNS)
If you do not know the address of a person, you can frequently find it in the telephone directory. On the
Internet, the equivalent to a telephone directory is the DNS (Domain Name Service). Each Web site has a
domain name (such as “mysite.com”) that is equal to an IP address. When you type a domain name to
show a Web site, your computer gets the IP address from a DNS server.
A URL (Uniform Resource Locator) includes a domain name and a protocol. An example of a URL is:
http://www.watchguard.com/
In summary, the DNS is the system that translates Internet domain names into IP addresses. A DNS
server is a server that performs this translation.
Services
A service opens access from your network to a computer that is external to your network. You use ser-
vices to send e-mail or move files from one computer to a different computer through the network.
These services use protocols. Frequently used Internet services are:
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