The subinterface supports an IPv4 address. You can configure a PPPOE client on either
a physical interface or a subinterface, but not both at the same time. Only one
PPPoE subinterface is supported on a physical interface. Before you begin
configuring a PPPoE client, ask your ISP what VLAN tag to use for your connection.
You must enter that tag when you configure the subinterface number and the
Tag
. The task below assumes you have already configured a
Layer 3 Ethernet interface on the firewall with a security zone.