MacBook Pro ip address same as airport

MacBook Pro Yosemite 10.10.2
Airport Wireless (I don't have specs for this connection point)
I frequently have Girl Scout meetings at a location (friend's place of business) that has wifi. The router is an airport and the provider is Comcast.
It seems that all other devices do not have a problem connecting to this wifi, except for my macbook pro. I have multiple ipads, pc and mac laptops, iphones, all connect.
When I try to connect with my MacBook Pro I get an error telling me that I cannot connect because I'm trying to use an ip address that is already on the system.
After further investigation I discovered that the computer is defaulting to the ip address of the airport.
I tried entering the ip address in manually. To be sure I had an ip address that had worked I used the ip address an ipad was using and shut of the ipad. I could get a connection to the network. The green light and a message telling me I'm connected to the network. But I could not get an internet connection.
This is so frustrating. Why is it so difficult? I have looked all over the place for an explanation. Thinking there is some stupid setting that I'm missing... hope it's a simple fix! I'm worried this could happen at another location when I need it even more!

Thanks BTF. Presumably only my MacBook Pro and the Apple TV are connected to the internet as the Airport Express is only set up to join the existing network with the crappy router as the base station. Neither the ATV or AE have static IPs assigned.
I have since restarted my MacBook Pro and at present have Airplay audio streaming to the AE and video to the ATV simultaneously without any (at the moment) problems.

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============================
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=====================
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To all that might be having this same issue, I have confirmed with Apple that it is a problem (and the case has been escalated). In a nutshell, I am trying to stream music from my Macbook Pro to the network which will then talk to the airport express boxes.
The Macbook Pro has an N-airport extreme card.
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I have been having problems with my dlink dir 625 n router as well and after months of problems I finally fixed the problem. The funny thing was that everything worked fine with my imac... it was the macbook pro's airport that wasn't seeing the router correctly.
I just enabled wap2 on the router as the security setting and for some reason now everything is running as it should, upload and connectivity are great!
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MacBook Pro ip address same as airport

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