discovery_smb_isp_chapter_4_en思科網(wǎng)絡(luò)技術(shù)學(xué)院ccna40官方資料-ccnadiscovery-cac建議版discovery_ppt英文版-d2_smb-資料下載頁(yè)
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【正文】 to the pool. hen configuring NAT for user access to the outside, configure dynamic NAT 28 思科網(wǎng)絡(luò)技術(shù)學(xué)院理事會(huì) . PortBased Network Address Translation (PAT) Port address translation (PAT) is also called NAT overload ,it translates multiple local addresses to a few or a single global IP address. The gateway translates the local source address and port bination in the packet to a single global IP address and a unique port number above 1024. Because there are over 64,000 ports available, a router is unlikely to run out of addresses, which could happen with dynamic NAT. 29 思科網(wǎng)絡(luò)技術(shù)學(xué)院理事會(huì) . PortBased Network Address Translation (PAT) A gateway does not even create a translation unless a host on the inside work initiates the munication. Handson Lab Determining PAT 30 思科網(wǎng)絡(luò)技術(shù)學(xué)院理事會(huì) . IP NAT Issues Some applications increase the work load of the router because they embed an IP address as part of the encapsulated data. The router must replace the source IP addresses and port binations that are contained within the data, as well as the source addresses in the IP header. 31 思科網(wǎng)絡(luò)技術(shù)學(xué)院理事會(huì) . Summary ? IP addressing can be tailored to the needs of the work design through the use of custom sub masks. ? Classless subting gives classful IP addressing schemes more flexibility through the use of variable length sub masks. ? Network Address Translation (NAT) is a way to shield private addresses from outside users. ? Port Address Translation (PAT) translates multiple local addresses to a single global IP address, maximizing the use of both private and public IP addresses. 32 思科網(wǎng)絡(luò)技術(shù)學(xué)院理事會(huì) .
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