Am I about to shoot myself in the foot?

From: MyndPhlyp (notreally@home.now)
Date: 02/16/03 

From: "MyndPhlyp" <notreally@home.now>
Date: Sat, 15 Feb 2003 19:56:37 -0500

I would like to have the ability to Telnet into an ADSL modem from the LAN.
The problem is the PPPoE router - regardless of the routing table setup or
the IP network arrangement, the PPPoE router wants to either keep the Telnet
packets on the LAN side or sends them out via the PPPoE tunnel to the
Internet on the WAN side.

So here's my idea:

Internet => modem => hub => router => workstation
                                      | |
                                      | |
                                       ==============

For those of you who cannot make out the diagram, the workstation would have
two NICs - one with an IP network for the PPPoE router's LAN and the other
for the modem's LAN. One path bypasses the router and connects to the hub
giving it a free and clear route to the hub's LAN port. The other path goes
through the router.

The question I have is this:

Is the PPPoE path the ONLY path for Internet traffic (meaning the Internet
cannot circumvent the PPPoE tunnel and gain access to the workstation via
the hub connection over plain ol' Ethernet)?

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