ethernet controller dual lan

hi I have installed an ethernet controller dual lan (pci and the only available around :) ). it has been perfectely recognized by the system as enp5s6f0 and as enp5s6f1. the driver is loaded as it is shown by the output of lspci -v. howevert the net is unreachable. I try to run ping and ports -u and no sign of connection. I have configured /etc/rc.d/net with dhcp. each port is connected to the rooter. tks