[ale] HELP, need to setup wireless access point!

[Ron Frazier]

Hi Michael W. (since we have two Michael's),

I hadn't thought of the possible conflict you mentioned, but I already 
had the DHCP servers in each of my routers set to distribute LAN 
addresses on different subnets.  The cable modem would never hand me a 
192.168 address, so it works OK.  Both you and Michael T. make some good 
points about potential problems, and this strategy might not apply to 
more complex commercial networks.  I'm in a home office situation.  As 
detailed in another post, my setup is:

wifi router 1 --> wifi router 2 --> wired router 3 --> cable modem

The only shared resource I have is a printer, which is connected to 
router 2.  Anyone logged into router 1 or router 2 can use the printer.  
As I noted in the other post, a router is like a one way valve, 
unsolicited data doesn't go backwards from the WAN to the LAN port.  So, 
it IS true that anyone connected to router 3 would NOT be able to use 
the printer on router 2.  However, I only use that router for port 
stealthing anyway, and don't connect directly to it.

I don't do any gaming, at least at this moment, so that's not a problem.

I think it's good to have these dialogs, and bring these issues out into 
the open, and realize there is always more than one way to build a network.

Sincerely,

Ron

On 02/04/2011 01:58 PM, Michael H. Warfield wrote:
> It will sort of work (for some value of "work") but the real gotcha's
> happen if the two NAT's are using the same address range (a very
> frequent occurance) and then conflict.  The inner NAT can get really
> confused if his WAN port and default gateway is on the same subnet as he
> is offering on the LAN side of the house.  This is one reason why CGN
> (Carrier Grade NAT or ISP NAT) will probably use 240.0.0.0 and up.  That
> block is reserved and discussions are ongoing at the IETF and recently
> at an ARIN conference here in Atlanta.  Double NAT does break
> somethings, though.  That was mentioned at that conference in that some
> things are going to break with CGN that just can not be fixed (mostly
> certain games, I heard them say).  It also won't help if you need a flat
> address space between the WAN port and the WLAN wireless and the LAN
> ports say for shared network resources and Windows stuff.
>    

-- 

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Ron Frazier

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