Netgear DG834 Instructions d'exploitation télécharger pdf (Page 105)

Reference Manual for the Model DG834 ADSL Firewall Router

Network and Routing Basics B-7

NETGEAR strongly recommends that you configure all hosts on a LAN segment to use the same

netmask for the following reasons:

• So that hosts recognize local IP broadcast packets

When a device broadcasts to its segment neighbors, it uses a destination address of the local

network address with all ones for the host address. In order for this scheme to work, all devices

on the segment must agree on which bits comprise the host address.

• So that a local router or bridge recognizes which addresses are local and which are remote

Private IP Addresses

If your local network is isolated from the Internet (for example, when using NAT), you can assign

any IP addresses to the hosts without problems. However, the IANA has reserved the following

three blocks of IP addresses specifically for private networks:

10.0.0.0 - 10.255.255.255

172.16.0.0 - 172.31.255.255

192.168.0.0 - 192.168.255.255

NETGEAR recommends that you choose your private network number from this range. The

DHCP server of the DG834 ADSL router is preconfigured to automatically assign private

addresses.

Regardless of your particular situation, do not create an arbitrary IP address; always follow the

guidelines explained here. For more information about address assignment, refer to RFC 1597,

Address Allocation for Private Internets, and RFC 1466, Guidelines for Management of IP

Address Space. The Internet Engineering Task Force (IETF) publishes RFCs on its Web site at

www.ietf.org.

Single IP Address Operation Using NAT

In the past, if multiple PCs on a LAN needed to access the Internet simultaneously, you had to

obtain a range of IP addresses from the ISP. This type of Internet account is more costly than a

single-address account typically used by a single user with a modem, rather than a router. The

DG834 ADSL router employs an address-sharing method called Network Address Translation

(NAT). This method allows several networked PCs to share an Internet account using only a single

IP address, which may be statically or dynamically assigned by your ISP.

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Netgear DG834 Instructions d'exploitation Page 105