Cyclades AlterPath OnBoard, Administrator'S Manual

Page: 395 / 460

Appendix A: Advanced Device Configuration 359
Understanding Address Configuration for Connected Devices
The following figure (Figure A-14) shows the same configuration as Figure
A-6, but with the addition of virtual IP addresses.
Figure A-14 shows an example of virtual network configuration that enables
virtual addresses to be assigned to connected devices and to the OnBoard. The
administrator plans to assign virtual IP addresses in the 172.20.0.1 range to
hide the real private subnet IP addresses.
Figure A-14: Example 3: Virtual Network Configuration
AlterPath OnBoard
Primary Ethernet port (eth0)
IP: 203.1.2.3
Subnet mask:255.255.255.0
Internet
sp3
sp1
Private subnet (sub1): 192.168.1.0 Subnet mask 255.255.255.0
Private subnet (sub2): 192.168.4.0 Subnet mask 255.255.252.0
Virtual network address: 172.20.0.0 Subnet mask 255.255.0.0
IP: 192.168.1.3
=> Virtual IP 172.20.0.3
sp2
sp4
OnBoard side IP:192.168.4.1
IP: 192.168.1.2
=> Virtual IP 172.20.0.2
IP: 192.168.4.22
=> Virtual IP 172.20.0.2
IP: 192.168.4.21
=> Virtual IP 172.20.0.4
OnBoard side IP:192.168.1.1