Joshua Draper wrote:
>> The reason is that with the fitlering, you are using a proxy which is
>> actually doing the talking for the client to the various servers.  
>> It's a
>> middle man and as such needs to be able to send traffic and receive  
>> traffic
>> which requires an IP.
> 
> I was thinking something along those lines, but I was not sure.   
> Thanks for the clarification.

You're right of course.  I've built plenty of bridging firewalls over
the years that actually were completely invisible.  No IP address
whatsoever.  But the machine only did packet filtering, not proxying.

To get this working on a single-IP comcast network, what you'd want,
then, is to connect the box to the cable modem, then connect the other
interface to the wireless access point in one of the LAN slots, not the
WAN port.  THis makes the WAP a mere switch.  Configure the WAP to have
an address like 192.168.1.2, and make the filter box 192.168.1.1.  Then
you turn off DHCP and all firewalling on the WAP.  The filter box now
becomes the DHCP server, the DNS proxy, and the filtering proxy.

Michael


> 
> Joshua Draper
> Department of Civil and Environmental Engineering
> Brigham Young University
> 
> 
> 
> 
> 
> 
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