
Scenario Description
Cisco 7100 Series VPN Configuration Guide
3-2
Scenario Description
Figure 3-1 shows a headquarters network providing a remote office access to the corporate
intranet. In this scenario, the headquarters and remote officeare connected through a secure
GRE tunnel that is established over an IP infrastructure (the Internet). Employees in the
remote office are able to access internal, private web pages and perform various IP-based
network tasks.
Figure 3-1 Intranet VPN Business Scenario
Figure 3-2 shows the physical elements of the scenario. The Internet provides the core
interconnecting fabric between the headquarters and remote office routers. Both the
headquarters and remote office are using a Cisco 7140-2T3 as a gateway router. Both
routers have two high-speed synchronous serial T3 interfaces, two Fast Ethernet
10/100BaseT autosensing interfaces, and one Integrated Service Module (ISM) installed.
The ISM provides hardware-based encryption services for any interface installed in the
router.
The GRE tunnel is configured on the first serial interface in chassis slot 1 (serial 1/0) of the
headquarters and remote office routers. Fast Ethernet interface 0/0 of the headquarters
router is connected to a corporate server and Fast Ethernet interface 0/1 is connected to a
Web server. Fast Ethernet interface 0/0 of the remote office router is connected to a PC
client.
Corporate
Intranet
Headquarters
router (hq-sanjose)
Remote office
router (ro-rtp)
Remote
office
network
Internet
Serial line Serial line
GRE tunnel
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