宽带共享技术.ppt

INTERNET的各种接入方式 PSTN+MODEM ISDN BRI ADSL ISDN PRI 长宽等 GPRS 共享技术 PROXY SERVER代理服务器 ICS NAT 连接方式 PROXY SERVER WINGATE SGATE等多种软件。 NAT Use NAT if: You need to connect to the Internet and your hosts do not have globally unique IP addresses You change over to a new ISP that requires you to renumber your network Two intranets with duplicate addresses merge You want to support basic load sharing NAT Overview and Terminology NAT Operation NAT functions: Translation inside local addresses Overloading inside global addresses TCP load distribution Handling overlapping networks Translating Inside Local Addresses Overloading Inside Global Addresses TCP Load Distribution Dynamic NAT Configuration Configuring Inside Global Address Overloading Configuring TCP Load Distribution Configuring NAT to Translate Overlapping Addresses Verifying NAT Troubleshooting NAT Clearing NAT Translation Entries CASE xyz公司 长宽 接入 没有固定的 ip Inside hosts250 最经济 设备选型 Cisco 16xx/26xx/36xx Cisco 25xx Cisco 8xx/100x TP-LINK R402/R410/R460/R480 (with TWO Ethernet PORT） 配置 interface F0/0 ip address DHCP ip nat outside no cdp enable interface F0/1 ip address 192.168.0.1 255.255.255.0 ip nat inside ip route 0.0.0.0 0.0.0.0 F0/0 ip nat inside source list 1 interface F0/0 overload access-list 1 permit 192.168.0.0 0.0.0.255 dialer-list 1 protocol ip permit Purpose: This figure displays the dynamic NAT configuration output. Purpose: This figure describes how to configure inside global address overloading. Purpose: This figure describes how to configure NAT to translate overlapping addresses. Purpose: This figure describes how to configure TCP load distribution. Purpose: This figure describes how to verify your NAT configuration output. Emphasize: The upper output box displays the typical NAT table. The lower output box displays the NAT table with overloading. Note: When looking at the IP NAT translations, you may see many translations from the same host to the same host at