[arm-allstar] Assigned local wireless IP address

[Doug Crompton]

Just a point because this has caused some confusion with some users. If you use the DTMF wireless switching script from the hamvoip.org howto's and/or you switch wireless access points in some other way there is a possibility that your DHCP assigned IP address may remain the same when switching from a home wifi to a cell hotspot. This is not a problem but here is an explanation why this happens.

This would generally happen when the hotspot device has the same dhcp range as your home wifi, for instance 192.168.1.x  

Verizon jetpack or MIFI hotspots often use the 192.168.1.x range. 

When restarting with the new hotspot the dhcp client asks for the same IP it is currently assigned and if it is available from the server it would remain the same confusing you that it did not really switch from one hotspot to the other.

I do not have one of these devices but in cases where it is on the same subnet you could possibly through a web page login to the device and change the dhcp address range to something like - 192.168.40.x - then you will know from the spoken IP when you change hotspots that it is actually on the device you want. 

There is no requirement that you do this. When using the DTMF switching script and the integrity of the script and files it calls is not in question there is no possibility you would be on the wrong hotspot even though it is the same local IP. The wpa_supplicant file would ONLY have the ssid and passphrase of the hotspot you select and could not be connected elsewhere.
73 Doug
WA3DSP
http://www.crompton.com/hamradio
 		 	   		  
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