boost::program_options - how to handle multiple sections with the same name in INI file

In a config like below; is there a way to handle individual sections.

I am looking for a way to validate individual "server" sections below, in a reliable manner.

[basic]
number_of_servers=3

[server]
ip=10.20.30.40
password=sdfslkhf    

[server]
ip=10.20.30.41
password=sdfslkhf

[server]
ip=10.20.30.42
password=sdfslkhf

[server]
password=sdfslkhf

[server]
ip=10.20.30.42