ML wifi dropping fixed by no double NAT on APE, but no guest network in no NAT bridge mode.

Question

ML wifi connections drop on Airport Extreme with dual NAT
I have a 2011 MBP, and a 2010 Airport Extreme.  Ever since installing Mountain Lion, the MBP constantly drops wifi connection to the Airport Extreme.  It doesn't drop wifi connection at the coffee shop. 
Fixed by bridge mode
So I started the AirPort Utility.  It informed me the AirPort Extreme (APE) has dual NAT, because the cable modem has NAT, and to change the APE to bridge mode.  I did that.  It fixed it!  No dropped wifi.  However, a few hours later, my neighbors came and told me the guest network is gone!  So it fixed it for me, but broke my neighbor's connection.  So I switched the APE back to NAT.  Now my neighbor has wifi but my ML wifi connection is now dropping all the time.
No guest network in bridge mode
The APE doesn't have a guest network in bridge mode:  http://www.dslreports.com/forum/r25840392-airport-extreme-bridge-mode-guest-conn ect

Answer 1

Linc, I agree it shouldn't work in bridge mode.  I don't like that the Cable ISP is using NAT, but it is.  All of these devices attached to my Airport Express are working.
From Aiport Utility:
     10.53.64.1     Internet router address
     10.53.73.8        Airport Express
From System Preferences, Screen Sharing:
     10.53.65.66     MacBook Pro
     10.53.65.65     MacMini (ethernet connected)
                           Neighbor's Playstation (ethernet connected)
                           Neigbhors Windows laptop (wifi connected)
From iPod Touch (http://techtips.salon.com/ipod-touch-ip-address-4209.html):
     10.53.65.153   iPod Touch 4th gen
     10.53.65.67     iPod Touch 3rd gen
Traceroute (both with and without the AE) shows the first two hops identical private IP addresses.  So the AE is definitely in bridge mode, not routing.  The ISP is giving me a private IP address.
Traceroute with Airport Extreme
traceroute www.apple.com
traceroute to e3191.c.akamaiedge.net (96.16.21.15), 64 hops max, 52 byte packets
1  10.53.0.1 (10.53.0.1) 8.123 ms  7.218 ms  8.513 ms
2  10.0.52.62 (10.0.52.62)  7.651 ms  8.257 ms  7.388 ms
3  static.customer-201-116-nnn-nnn.uninet-ide.com.mx (201.116.nnn.nnn)  13.757 ms  8.553 ms  10.440 ms
4  inet-bcs-snjosecabo-11-s4-2-0.uninet.net.mx (187.130.146.154)  15.486 ms  10.052 ms  10.098 ms
5  bb-la-grand-4-pos0-4-2-0.uninet.net.mx (201.125.19.38)  42.289 ms  42.592 ms  42.945 ms
6  12.89.4.5 (12.89.4.5)  43.300 ms  41.532 ms  42.443 ms
^C
Traceroute from computer plugged directly into Cable Modem. with wifi turned off
traceroute www.apple.com
traceroute to e3191.c.akamaiedge.net (96.16.21.15), 64 hops max, 52 byte packets
1  10.53.0.1 (10.53.0.1)  6.881 ms  7.050 ms  7.557 ms
2  static.customer-201-116-nnn-nnn.uninet-ide.com.mx (201.116.nnn.nnn)  9.341 ms
    10.0.52.62 (10.0.52.62)  7.090 ms
    static.customer-201-116-nnn-nnn.uninet-ide.com.mx (201.116.nnn.nnn)  9.106 ms
From the Cisco thread: 
"3. Apr 10, 2010 2:43 AM (in response to chemilio)
Re: Traceroute output: What is the first hop ip?
It may depend on how the ISP do their network infrastructure.  I've seen internal IP addresses in the first few hops of a Cable ISP but I can't remember whether was it the 1st hop or 2nd hop onwards.
9. May 17, 2011 1:33 PM (in response to chemilio)
Re: Traceroute output: What is the first hop ip?
Most ISPs use private RFC1918 IP address schemes for their private network. They effectively treat your street as a LAN, then perform NAT/PAT on your behalf at their CO. This means they can translate onto the public IPv4 or IPv6 internet and take a lot more control over the traffic generated by your network/PC"
https://learningnetwork.cisco.com/thread/12254
http://en.wikipedia.org/wiki/Private_network