3 pppoe-connections, only one NIC. Does this work?

Problem: How do I create 3 or more connections over ethernet, using
single NIC, and other end supports only pppoe? I would like to migrate
these 3 hardware-firewalls into one, running Linux.

This will be my Linux-based firewall, using iptables with "default gw
nexthop ppp0 nexthop ppp1 nexthop ppp2" and so on.. (more about that
avaible in news message @
http://www.ussg.iu.edu/hypermail/lin...07.3/0028.html)

EtherTAP & some C++ would be one solution.. like creating three "virtual
ethernet NIC's", forwarding all packets from those into my real ethernet
NIC and vice versa.

Yeah, having 3 NIC's inside my firewall-server, which are connected to
Switching Hub with ISP's DSL-line would be a easiest solution, but the
Slackware 9.0's `adsl-start´ script says "Hey, your link is up and
running allready!" after first is connected.

This RoaringPenquin.com's rp-pppoe usermode-driver is working perfectly
with one connection, but what about the 3 other ppp-connections? How do
I add them with automatic connection restore?