Cabletron Systems SmartSwitch - Manual (Page 239)

SmartSwitch Router User Reference Manual 239
Chapter 15: Web Hosting Configuration Guide
The network shown above can be created with the following load-balance commands:
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:.
load-balance create group-name quick-www virtual-ip 207.135.89.16 virtual port 80
protocol tcp
load-balance create group-name quick-ftp virtual-ip 207.135.89.16 virtual port 21
protocol tcp
load-balance add host-to-group 10.1.1.1 group-name quick-www port 80
load-balance add host-to-group 10.1.1.2 group-name quick-ftp port 21
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