Notes on setting up our Airport Extreme as an Internet NAT router.

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Record of setup as a wireless router:

"Base Station" tab:

Base Station Name: sdjc
Base Station Password: ********
Checked both "Remember this password ..." and "Allow setup over WAN"

"Internet" tab:

   Connect Using: Static
    IPv4 Address: 192.168.1.150
     Subnet Mask: 255.255.255.0  <-- Changed to 255.255.0.0 2014-6-15 by jc
  Router Address: 192.168.1.17
     DNS Servers: 192.168.1.17
                : 207.172.3.8
IPv6 DNS Servers:
     Domain Name: sdjc
Internet Options ... popup:
   Configure IPv6: Automatically
        IPv6 Mode: Native

"Wireless" tab:

         Network Mode: Create a wireless network
Wireless Network Name: sdjc
    Wireless Security: None
 Enable Guest Network: [not checked]

"Network" tab: 

Router Mode: DHCP Only
 DHCP Range: 192.168.1.151 to 192.168.1.199
(nothing else filled in)

"AirPlay" tab:
Checked "Enable AirPlay"
Airplay Speaker Name: sdjc
Airplay Speaker Password: [blank]
 Verify Speaker Password: [blank]

Oddity: The above setup works when the ethernet cable is plugged into  either
of  the  two  ports,  but  the  one  marked "<->" (the "LAN" port) produces a
flashing yellow light on the Airport and a "1" in a red circle on the Airport
Utility's  screen.   Moving  it to the port marked with a circle of dots (the
"WAN" port) causes it to turn green.  It seems to work the same  either  way,
but  the  "wrong"  one according to the online manuals is the one that gets a
green signal.

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