single host multiple IP address configuration in Linux

Just write for avoid the forget.

1. configure multiple IP address in /etc/hosts

If we want to assign two IP addresses to a single host named "test", we can just simply configure the /etc/hosts like:

192.168.1.1 test
192.168.1.2 test

After this configuration, if we call the C function gethostbyname("test") to get the IP addresses of host "test", most probably it returns only one single IP address.

2. turn the "multi on" in /etc/host.conf

add the following line to the end of /etc/host.conf

multi on

After this modification, the gethostbyname("test") will return two IP addresses.