Network Router User Manual

Chapter 17: Web Hosting Configuration Guide
242 SmartSwitch Router User Reference Manual
Virtual IP Address Ranges
ISPs who provide web hosting services for their clients require a large number of virtual
IP addresses (VIPs). The load-balance create vip-range-name and load-balance add host-
to-vip-range commands were created specifically for this. An ISP can create a range of
VIPs for up to an entire class C network with the load-balance create vip-range-name
command. Once the vip-range is in place, the ISP can then create the corresponding
secondary addresses on their destination servers. Once these addresses have been created,
the ISP can add these servers to the vip-range with the load-balance add host-to-vip-
range command. These two commands combined help ISPs take advantage of web
servers like Apache which serve different web pages based on the destination address in
the http request. The following example illustrates this:.
Router
S1
10.1.1.16 www.computers.com
10.1.1.17 www.dvd.com
10.1.1.18 www.vcr.com
Internet
Web requests:
207.135.89.16 www.computers.com
207.135.89.17 www.dvd.com
207.135.89.18 www.vcr.com
S2
10.1.2.16 www.computers.com
10.1.2.17 www.dvd.com
10.1.2.18 www.vcr.com
...
...
...
10.1.1.50 www.toys.com
10.1.2.50 www.toys.com
207.135.89.50 www.toys.com
Group Name Virtual IP TCP Port
Destination
Server IP
TCP Port
www.computers.com 207.135.89.16 80 S1: 10.1.1.16
S2: 10.1.2.16
80
www.dvd.com 207.135.89.17 80 S1: 10.1.1.17
S2: 10.1.2.17
80
www.vcr.com 207.135.89.18 80 S1: 10.1.1.18
S2: 10.1.2.18
80
www.toys.com 207.135.89.50 80 S1: 10.1.1.50
S2: 10.1.2.50
80