Classification of Internet access using vrouters (1)

What is the vro Access Control List function?

Vro provides basic communication traffic filtering capabilities-this is the access control list, which is the command line of a series of statements for the router to allow and deny, these statement controls the IP addresses included in the user's data package and upper-layer protocols such as TCP, UDP, and FTP. Access Control List ACL) is a list of commands applied to the router interface. These command lists are used to tell the router which packets can be received and which packets need to be rejected, that is, they can be forwarded and discarded. Whether a data packet is rejected or received can be determined by the indication conditions of the source address, Destination Address, protocol, and port number.

The WAN connection of the network structure proposed by netizens has two lines, one is the leased line to CERNET, and the other is the ADSL to the WAN of other telecom carriers, such as CNCNET of China Netcom. According to the requirements put forward by netizens, "If a user accesses CERNET, it still uses local broadband access, the easiest way is to control the IP addresses of all the traffic destined for the education network port to become the IP address segment of the education network. I think netizens should be able to obtain the IP address segment of the education network from the CERNET network center. ), the IP address of the access traffic to ADSL is not restricted.

Required Device
As we know, the "Access Control List" is a basic function of all routers. Therefore, you can select any vro of the above grade. In this case, cool recommended Cisco's Cisco2600 series routers to this user, as shown in Figure 1 ). The product with the product code Cisco 2611XM should be able to meet the solution requirements of this netizen. The Cisco 2600 series is an award-winning modular multi-service product family that provides flexible LAN-to-WAN configurations, diverse security options, comprehensive voice and data services, and a series of high-performance CPUs, with a wide range of functions and interfaces, You can flexibly select more than 50 modules to be added to the vro to meet the needs of various line types, so that the Cisco 2600 family can adapt to application requirements from now to the future.

Cisco 2611XM supports the following features:

• Multi-Service speech/Data Integrated Service

• VPN access with Firewall and encryption options

• Consider accessing the Analog dial access services

• Routing with bandwidth management

• Lan vlan Routing

• High-speed business-level DSL access Transmission

• Low-cost ATM Access

• Low Density Switching

The Cisco 2611XM Multi-Service Router provides a network module slot, two 10/100 BaseT Ethernet interfaces, two integrated wan interface card slots, and one advanced integrated module slot, as shown in figure 2 ). We usually use the first three items. In this case, I want to purchase them.
Two WAN Interface Card modules:

1) WIC-1T See figure 3) this high-speed serial wan interface card will be installed in the CISCO2611XM wan interface card slot 1, through the serial cable to the baseband MODEM and other communication terminal equipment, and then connected to the education network line.

2) WIC-1ADSL see Figure 4) This ADSL wan interface card contains ADSL Channel Communication Unit, so do not have to purchase adsl modem, install it in CISCO2611XM wan interface card slot 2. You can directly connect to the user-requested ADSL telephone line through its 201711th interface.