What exactly are you trying to do to the DHCP server and you lose connectivity?
With the default configuration, the DHCP server will give to the LAN host IP addresses in the .100-250 range.
So, as long as the LAN IP address is correct in the 10.X.Y.Z range, you don't need to change anything else.
Also have a look at the travelmate package. Although developed for traveling routers, it could work in your case too.
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