network engineering
Firewall A
Internet
Router
Internet Outside
Zone
Firewall B
Corporate Network
10.1.1.0/24
"DMZ"
Inside Services
VPN Concentrator
Firewall C
Router
Internet Outside
Zone
Firewall D
"DMZ"
VPN Concentrator
Remote Office Network
10.1.2.0/24
Telecommuter
No fixed IP
140.192.1.1
140.192.1.2
140.192.2.1
140.192.2.2140.192.2.3 140.192.22.2 140.192.22.3
140.192.22.1
140.192.12.2
140.192.12.1
10.1.1.1 10.1.2.1
10.2.1.1
10.2.1.2 10.22.1.1
10.22.1.2
VPN Tunnel