2 IPs on same machine

[shuan.tay\(PCI鄭祺勛\)]

Dear DBAs,   Our Redhat 7.2 machine has 2 IPs configured. So, to listen on these 2 address, should i configure the listener to listen on 2 different port? Or just the same default 1521 port? We're using Oracle 8.1.6.   Thanks in advance.