Motels that offer broadband in the room usually do it as a wired connection. If that is the case, just plug the ethernet cable into the iMac and all will be well. Make sure you have the Mac Firewall turned on. System Preferences/Sharing/Firewall Tab.
Sometimes the room is covered wirelessly. Just let the iMac find the connection and all should be well.
You didn't say how you were connecting wirelessly at the house. I gather that you have a wireless router and that is what you were connected to.
You probably were not wireless all the time. Just that when you removed the wired connection, the iMac automatically found another means of communication and used that, seamlessly. The system "should" automatically use the best (fastest) connection available to it. Smart huh!
An iMac seems to be a rather large chunk of equipment to be taking on a trip but I guess that if you are taking a bunch of film equipment then one more 20" device is not going to matter.
Enjoy the trip. Let us know how you got on.
I am a newbie and loving my IMAC, but feel a little intimadated about some issues. I am planning a 4 to 6 week trip to film in Arizona which means I'll be using motel high speed connections during that time. Since I have only used my home local connection before I am wondering if there is anything I need to to know about the security while on my trip. I was happy to see the way the Mac setup my connection without my involvement. I actually had intended to connect via cable in the beginning, coming from windows, I expected a hassle and knew I needed to download updates immediately. After about three days use and feeling more confident I decided it was time to go wireless. I disconnected the cable from the cable and when I went to disconnect it from the router I found I never had even connected it to begin wait so I had been wireless from the beginning. What can I expect on my trip? Will it be more involved and will it be secure?
Thanks for your help.