Netgear 802.11g Uživatelský manuál stáhnout pdf (Strana 202)

Reference Manual for the ProSafe Wireless 802.11g Firewall/Print Server Model FWG114P v2

B-8 Networks, Routing, and Firewall Basics

201-10301-02, May 2005

The router accomplishes this address sharing by translating the internal LAN IP addresses to a

single address that is globally unique on the Internet. The internal LAN IP addresses can be either

private addresses or registered addresses. For more information about IP address translation, refer

to RFC 1631, The IP Network Address Translator (NAT).

The following figure illustrates a single IP address operation.

Figure 11-3: Single IP Address Operation Using NAT

This scheme offers the additional benefit of firewall-like protection because the internal LAN

addresses are not available to the Internet through the translated connection. All incoming

inquiries are filtered out by the router. This filtering can prevent intruders from probing your

system. However, using port forwarding, you can allow one PC (for example, a Web server) on

your local network to be accessible to outside users.

92.168.0.2

92.168.0.3

92.168.0.4

92.168.0.5

192.168.0.1 172.21.15.105

Private IP addresses

assigned by user

Internet

IP addresses

assigned by ISP

1 2 ... 197 198 199 200 201 202 203 204 205 206 207 ... 295 296

Žádné komentáře

Netgear 802.11g Uživatelský manuál Strana 202