Strange AirPort Extreme Guest Network BSSID
This is the first time I have used the Guest Network feature on my AirPort Extreme without a password.
I have two children at home with their Chromebooks and they wouldn't stay connected to our WiFi network that uses a password. When their Chromebooks go to sleep they "forget" our home WiFi password.
I get strange BSSID and IP address on their laptops when they connect to the Guest WiFi network.
The IP address is not on my normal network and none of the Apple wireless routers I own have the BSSID that appears on their Chromebooks:
172.16.42.1 Gateway/DNS
172.16.42.3 assigned to the device
Is this normal for a Guest Network created on Apple AirPort Extreme? If so how do I setup what DNS address they use. I use OpenDNS to filter the web for them.