Main Types of CISCO router proxy access

Source: Internet
Author: User

I believe that many users are using CISCO routers, and their product performance and features have been recognized by many people. The following uses CISCO routers as an example, I will introduce several successful configuration methods for reference:

With the rapid development of network technology, more and more ways are available for enterprises and institutions to access INTERNET shared resources. In most cases, ddnleased lines are widely used with their stable performance and good scalability, DDN connection is simple in terms of hardware requirements. Only one router and proxyserver are required, however, system configuration is a tough issue for many network administrators. The following uses a CISCO router as an example to describe how to configure a vro that has been successfully configured to allow your peers to use it to access INTERNET resources.

  Overall Ideas and device Connection Methods

10.0.0.0/8:10. 0.0.0 ~ 10.20.255.255

172.16.0.0/12: 172.16.0.0 ~ 172.31.255.255

192.168.0.0/16: 192.168.0.0 ~ 192.168.255.255

Under normal circumstances, when a workstation inside the Organization directly uses a route for external access, it is filtered out by the CISCO router because the workstation uses a reserved address on the Internet, as a result, Internet resources cannot be accessed. The solution to this problem is to use the NAT (NetworkAddressTranslation) address translation function provided by the routing operating system to convert private addresses on the Intranet to valid addresses on the Internet, this allows users with invalid IP addresses to access the Internet through NAT. in this way, you do not need to configure a proxy server to reduce investment, save valid IP addresses, and improve the security of the internal network.

  NAT has two types: Single mode and global mode.

The NAT single mode maps many local LAN hosts into an Internet address just like its name. All hosts in the LAN are regarded as Internet users for External Internet networks. The host in the local LAN continues to use the local address. In the global mode of NAT, the CISCO router interface maps many local LAN hosts to a certain Internet address range (IP address pool ). When the local host port is connected to a host on the Internet, an IP address in the IP address pool is automatically assigned to the local host. After the connection is interrupted, the dynamically assigned IP address is released, the released IP address can be used by other local hosts.

The following uses the network environment of our Organization as an example to list the configuration methods and processes for your reference. Our company uses China Unicom Optical Cable (V.35) to connect to the INTERNET. The CISCO router LAN uses the INTEL550 MB switch. China Unicom provides us with the following four IP addresses:

211.90.137.25 (255.255.255.252) is used for the WAN port of the local CISCO router.

211.90.137.26 (255.255.255.252) is used for the Peer (China Unicom) Port

211.90.139.41 (255.255.255.252) for your own control

211.90.139.42 (255.255.255.252) for your own control

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