port mapping and cl-http question

i need to serve to remote IP addresses from my cl-http-based 
application, running behind comcast's cable modem into my office 
network running NAT

i've got port mapping working so that i can give out an IP address, 
obtained from comcast's cable modem, and reach my cl-http server from 
a remote machine. i know this because i get a cl-http error page from 
my server, which says:

Bad Request: Unknown Virtual Host
The virtual host xx.yy.zz.qq [my cable modem's IP address] on port 
8000 is unknown.
-------
CL-HTTP/70.190 (Macintosh Common Lisp; 3.9.7)
-----------------------------------------------------------------------------
so it seems that my cl-http code isn't understanding the request 
that's coming in well enough to serve from my application code, but 
at least cl-http is connecting via port mapping correctly. my cl-http 
is running fine because i get served correctly from my app when i 
browse to the IP address of the serving machine inside my network

i figure there are 1 of 2 issues/ways to get this working:

- the way i'm using cl-http is wrong/bad form, but i'm not sure how

- i need to add a mapping from the cable modem IP address to the IP 
of my server machine somehow via cl-http code. is this the proper use 
of http:add-virtual-host? do i have to re-write every export-url 
form? my experiments with this have failed

i'm using the vanilla start-server.lisp code [MCL on Mac OS X]

all help welcome, thx in advance

-paul

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