Nortel 1010 用户指南

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Chapter 7 Configuring control tunnels 139
Nortel VPN Router Configuration — Basic Features 
 
Figure 28   Sample control tunnel environment
Branch office control tunnels allow anyone on the configured network to 
communicate with the Nortel VPN Router being managed. This allows a Nortel 
VPN Router to communicate with various systems within a company’s network 
operations center or corporate headquarters (the Cleveland private network). 
A user control tunnel allows a Nortel VPN Client to communicate with a Nortel 
VPN Router that is being managed. This allows network management personnel 
from anywhere in the world access to the management tasks.
If you work at a NOC in Cleveland and you manage a customer’s Nortel VPN 
Router that is located in Boston, you would want to use control tunnels. On one 
end of the control tunnel (the Nortel VPN Router under management), access is 
always restricted to the management address only. Access to the Boston Nortel 
VPN Router is limited. The Cleveland end of the tunnel could allow access to its 
entire private network. This allows multiple systems in your Cleveland NOC to 
communicate with the management address only of the Boston Nortel VPN 
Router; or for the Boston Nortel VPN Router to use remote servers (FTP, DHCP, 
RADIUS, and DNS servers) on the Cleveland private network.