Airport Express dolling out different networks

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Level 1

12 points

Airport Express dolling out different networks

Consider our airport express that, according to the airport express utility, shows the 10.0.1.x network as the LAN configured for DHCP for connecting computers. Despite this apparent configuration, my macbook air receives an address on the 192.168.x.x network, while at the exact same time, the Dell Inspiron receives an address on the 10.0.1.x network. The macbook is allowed through to the internet via it's 102.168.254.1 gateway received from the airport, while the Dell, though it can ping the 10.0.1.1 gateway is also receives from the airport, is not allowed onto the internet. Temporary fix was to manually configure the Dell with an IP address on the 192.168.x.x network. Power re-set of airport, computers, and DSL modem do nothing. I haven't seen any other posts to this issue. Anyone, anyone, Bueler? Many thanks.

airport express 2nd generation-OTHER, 7.6.3 firmware

Posted on Jul 9, 2013 4:02 PM

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Answer 1

Jul 9, 2013 4:23 PM in response to fwgs

Sounds like you have 2 routers, both providing DHCP and NAT services.

Can you provide the make and model number of your "modem"?

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Answer 2

fwgs Author

Level 1

12 points

Jul 10, 2013 5:33 PM in response to Bob Timmons

Windstream (Siemens) DSL modem: 4200.

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Answer 3

Jul 10, 2013 6:08 PM in response to fwgs

I can find info on a Siemens Speedstream 4200. Is this the device that you have?

This device is a modem/router that is providing DHCP and NAT services. By default, this device hands out IP addresses to clients in the 192.168.x.x. range.

So, a device that connects to your 4200 gets a 192.168.x.x IP address. The manual for the 4200 confirms this:

SpeedStream Router - Optus Internet Help

The Apple routers use the 10.0.1.x range by default. Any devices that connect to the Apple are getting 10.0.1.x range IP addresses.

Even if you do not have the exact version of the 4200 in the link above, based on the info that you have provided, you do have two devices on the network, both provding DHCP and NAT services. You only want one device on a network acting as a router delivering DHCP and NAT service.

The AirPort needs to be configured in Bridge Mode to take it out of router mode so that any devices that connect to the AirPort will receive the same 192.168.x.x IP addresses as devices that connect to the 4200.

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Answer 4

fwgs Author

Level 1

12 points

Jul 11, 2013 4:21 AM in response to Bob Timmons

The DSL modem doesn't have a wireless network set up on it, the wireless network is configured on the airport express. Both of these computers can join the wireless, airport express network, they just get two different addresses.

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Answer 5

fwgs Author

Level 1

12 points

Jul 11, 2013 4:22 AM in response to Bob Timmons

I will try this.. thank you.

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Answer 6

Jul 11, 2013 4:44 AM in response to fwgs

The DSL modem doesn't have a wireless network set up on it, the wireless network is configured on the airport express. Both of these computers can join the wireless, airport express network, they just get two different addresses.

So, if the modem/router is not providing wireless, and you have two computers that both connect using wireless, and one is on a 192.168.x.x range and the other is on a 10.0.1.x range, then you do have two different networks working.

Did you enable the Guest Network on the AirPort Express? That would explain two networks that are visible.

Or, is it possible that one computer is connected to another open wireless network around you?

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