All,

Here is the situation. I recently switched to Comcast business class. I was 
provided with a SMC Network cable modem. THis box is actually a switch 
consisting of four ports. Currently I have my AirPort router plugged into the 
SMC and thus I have a double nat situation. THe SMC is configured to handout 
DHCP addresses, which is how my AirPort gets its address, but I also am handing 
out addresses using DHCP to the devices on my private network. I actually am 
using DHCP reservations and for a specific reason.
I have setup mac address filtering to control certain machines on the network. 
Unfortunately the SMC lacks some of the features for controlling machines that 
are found in the Apple router. However, this double nat situation can and has 
created some issues for me. I could of course just bridge the AirPort and give 
up the whole deal on controlling machines on the network. That may very well 
end up being necessary in the end; however, before I do so, I wanted to ask if 
anyone had any thoughts. I did a little searching around on Google, but 
unfortunately I'm not sure exactly what to look for either. I don't think 
Google would take my message as a search term either. :)
Although I do not have any plans to do this, the advantage of double nat in 
this case is I could strap three more routers onto the gateway (SMC) and have 
some fun. Now maybe there is a way around all of this, but seems the current 
issue is IP6 tunneling, but I am more concerned if this could pose problems 
with other services. So, thoughts welcome and I'll keep poking around and see 
what I can learn. The good thing is that all seems to be working for the most 
part, so this is not a critical need situation. Just need to make sure I can 
vpn into the network at the office. :)

Thanks,
Scott

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