nat چیست و جه کاربردی دارد؟؟مرسی
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nat چیست و جه کاربردی دارد؟؟مرسی
[CODE]http://en.wikipedia.org/wiki/Network_address_translation[/CODE]
[QUOTE=mj_02003;250399]nat چیست و جه کاربردی دارد؟؟مرسی[/QUOTE]
[LEFT][SIZE=4][B]What is NAT[/B][/SIZE]
Windows Server 2003 provides network address translation (NAT) functionality as a part of the Routing and Remote Access service. NAT enables computers on small- to medium-sized organizations with private networks to access resources on the Internet or other public network. The computers on a private network are configured with reusable private Internet Protocol version 4 (IPv4) addresses; the computers on a public network are configured with globally unique IPv4 (or, rarely at present, Internet Protocol version 6 [IPv6]) addresses. A typical deployment is a small office or home office (SOHO), or a medium-sized business, that uses Routing and Remote Access NAT technology to enable computers on the internal corporate network to connect to resources on the Internet without having to deploy a proxy server.
The following figure is a simplified depiction of the Routing and Remote Access NAT service. When a client on the private network sends a request for information to a computer on the public network, the NAT-enabled router, located at the border between the private and the public networks, translates the outgoing packets and then sends them to the destination computer on the public network. The router also translates the response from the public network resource and returns the response to the client on the local network.
[B]NAT-Enabled Router Translating Request and Response Packets[/B]
[IMG]http://i.technet.microsoft.com/cc739385.f9ffc673-f2c0-4c37-b3fb-b864f7b55d70%28en-us,WS.10%29.gif[/IMG]
[B]NAT Architecture[/B]
Understanding the architecture of Routing and Remote Access NAT requires recognizing the relationship of the NAT routing protocol component to other routing components, to the NAT editors and proxies, to TCP/IP, and to the TCP/IP Address Resolution Protocol (ARP) module. The following figure illustrates Routing and Remote Access NAT architecture:
[B]Routing and Remote Access NAT Architecture[/B]
[IMG]http://i.technet.microsoft.com/cc756722.54dc467d-d984-472b-9cce-81275cad3564%28en-us,WS.10%29.gif[/IMG]
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دوست عزیز، به زبان خیلی ساده:
به فرآیند تبدیل آی پی های Private به آی پی های Public به منظور برقراری ارتباط آی پی های Private با بستر اینترنت، Nat گفته میشه.
شما تو محل کارت با آدرس آی پی 192.168.0.20 داری کار می کنی. طبیعتا شما با این آدرس نمی تونی وارد محیط اینترنت بشی. سرور اینترنت شما یا مودم یا Provader شما، داره واستون عمل NAT رو انجام میده. یعنی آدرس آی پی پکت های شما رو بر میداره و بجاش آدرس Public خودش رو میزاره. مثلا 12.12.12.12.
فکر کنم گویا باشه.
