define host {
use                            generic-host            ; Name of host template to use
host_name                      foo.bar.pl
alias                          foo
address                        2.2.2.2
check_command                  check-host-alive
max_check_attempts             5
notification_interval          120
notification_period            24x7 
notification_options           d,u,r
}

define host {
use                            generic-host            ; Name of host template to use
host_name                      bar.foo.pl
alias                          bar
address                        1.1.1.1
check_command                  check-host-alive
max_check_attempts             5
notification_interval          120
notification_period            24x7
notification_options           d,u,r
}