Делайте по аналогии:
dhcp-range=interface:em2,10.10.28.220,10.10.28.250,255.255.255.0,3h
dhcp-option=interface:em2,option:dns-server,10.10.28.254
dhcp-option=interface:em2,option:ntp-server,10.10.28.254
dhcp-option=interface:em2,option:router,10.10.28.254
dhcp-range=interface:p5p1,192.168.28.220,192.168.28.250,255.255.255.0,3h
dhcp-option=interface:p5p1,option:dns-server,192.168.28.254
dhcp-option=interface:p5p1,option:ntp-server,192.168.28.254
dhcp-option=interface:p5p1,option:router,192.168.28.254
dhcp-host=00:15:58:90:cc:08,ws01,10.10.28.101
dhcp-host=00:22:15:3d:39:0e,ws02,10.10.28.102
dhcp-host=00:0d:61:90:1a:9b,ws03,10.10.28.103
dhcp-host=d0:27:88:72:3e:9a,ws67,192.168.28.3
dhcp-host=d0:27:88:72:3e:a7,ws68,192.168.28.4
dhcp-host=d0:27:88:72:52:44,ws69,192.168.28.5