Was: how to reach modem on WAN port

To continue my thread of Jan, 12:

Well, this is with 1.33b1 on silent PC HW with embedded NIC (for WAN) 
and dual INTEL card for LAN and OPT1.

As explaned before I need to reach the modem om say, 192.168.178.1. The 
WAN connection is PPPoE, what is translated to PPPoA by the modem (yes, 
this modem is a Vigor120). So the address of WAN is PPP assigned.

I tried adding a few lines in the <secondary> block like this
<secondaries>
   <secondary>
     <if>wan</if>
     <ipaddr>192.168.178.254</ipaddr>
     <prefix>24</prefix>
     <descr>test</descr>
   </secondary>
</secondaries>

I probably need a nat rule too to reach that network but don't know how.

But I begin to wonder if WAN can have a secondary address at all.
I would expect to see it listed under "status interfaces". It isn't.

Any remarks? Manuel? Can I have secondary IP address on WAN at all? Also 
when WAN is on PPP mode?

TIA! Egbert Jan (NL)