Draytek 2800 Series User Guide

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Vigor2800 Series User’s Guide 
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After finished basic configuration of the router, you can access Internet with ease. For the 
people who want to adjust more setting for suiting his/her request, please refer to this chapter 
for getting detailed information about the advanced configuration of this router. As for other 
examples of application, please refer to chapter 4. 
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IP means Internet Protocol. Every device in an IP-based Network including routers, print 
server, and host PCs, needs an IP address to identify its location on the network. To avoid 
address conflicts, IP addresses are publicly registered with the Network Information Centre 
(NIC). Having a unique IP address is mandatory for those devices participated in the public 
network but not in the private TCP/IP local area networks (LANs), such as host PCs under 
the management of a router since they do not need to be accessed by the public. Hence, the 
NIC has reserved certain addresses that will never be registered publicly. These are known as 
private IP addresses, and are listed in the following ranges:     
From 10.0.0.0 to 10.255.255.255 
From 172.16.0.0 to 172.31.255.255 
From 192.168.0.0 to 192.168.255.255 
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As the router plays a role to manage and further protect its LAN, it interconnects groups of 
host PCs. Each of them has a private IP address assigned by the built-in DHCP server of the 
Vigor router. The router itself will also use the default private IP address: 192.168.1.1 to 
communicate with the local hosts. Meanwhile, Vigor router will communicate with other 
network devices through a public IP address. When the data flow passing through, the 
Network Address Translation (NAT) function of the router will dedicate to translate 
public/private addresses, and the packets will be delivered to the correct host PC in the local 
area network. Thus, all the host PCs can share a common Internet connection. 
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To acquire a public IP address from your ISP for Vigor router as a customer premises 
equipment, there are three common protocols: Point to Point Protocol over Ethernet 
(PPPoE), PPPoA and MPoAMulti-PVC is provided for more advanced setup of the 
above. 
In ADSL deployment, the PPP (Point to Point)-style authentication and authorization is 
required for bridging customer premises equipment (CPE). Point to Point Protocol over 
Ethernet (PPPoE) connects a network of hosts via an access device to a remote access 
concentrator or aggregation concentrator. This implementation provides users with 
significant ease of use. Meanwhile it provides access control, billing, and type of service 
according to user requirement. 
When a router begins to connect to your ISP, a serial of discovery process will occur to ask 
for a connection. Then a session will be created. Your user ID and password is authenticated 
via PAP or CHAP with RADIUS authentication system. And your IP address, DNS server, 
and other related information will usually be assigned by your ISP.