Airtunes with an Existing Network

OK, here's the deal. I have:
1 pre-existing wireless network that is public.
1 Airport express (which is only connected to the power strip and to my stereo)
1 stereo that I'd like to connect via Airtunes.
I can connect to my Airport network just fine. When on this network, I can't get online (which makes sense, since there is no ethernet going into my APE), but I can stream music to my stereo. When I am on the public network, I can connect to the Internet but I can't stream music (which also makes sense).
Is there some way that the APE can function as a network extender, allowing me to stream music and be online simultaneously? All FAQs and instructions for doing this assume that the existing network (the one that is connected) is an Airport network (this is not), and that the user can gain access to the settings for the router (which I also cannot).
Failing any of the above, is there some additional hardware I can pick up to make this work? Maybe something that connects to a wireless network and gives me an ethernet jack to plug into?
Thanks for all your help,
Daniel
Seattle, WA

Is there some way that the APE can function as a
network extender, allowing me to stream music and be
online simultaneously?
Yes, via WDS.
All FAQs and instructions for
doing this assume that the existing network (the one
that is connected) is an Airport network (this is
not), and that the user can gain access to the
settings for the router (which I also cannot).
Therefore you can not use WDS.
In theory you could configure the Airport Express to be a client on the public wireless network (configure it as a client does not require an Airport network or access to the router). However then anyone on the public network could stream AirTunes through your Airport Express. This also assumes there is no login via a browser required for the network (which is the case with some public wireless networks).
Failing any of the above, is there some additional
hardware I can pick up to make this work? Maybe
something that connects to a wireless network and
gives me an ethernet jack to plug into?
In theory, though I have not tried it, you could use something like an ethernet wireless bridge such as the Linksys WET54G to connect to the public wireless network and then connect the Airport Express to the WET54G and use it that way.
Assign static addresses to the Airport Express base stations.
iFelix

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Can anybody help me to access Internet with my existing network

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O.K. Still the crucial question remains whether you want the separation of the ISPs enforced or not, i.e. do you actively want to prevent someone to switch to the other ISP simply by reconfiguring some settings on the computer or not?
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Again, this separation only happens due to the different configuration of the computers. If anyone can freely reconfigure the computer he has it is easily possible to change the gateway address and thus swap the ISP. But as long as people comply with the rules it works.
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Same password..
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Hey everyone!
I just can't seem to figure out what I am doing wrong here...
I am working with an office network which was initially set up with a Linksys router and a separate Linksys hub connecting two Macs and a network printer in one particular room. We added several new iMacs and for ease of connectivity, decided to add a new Airport Extreme base as one of the new iMacs is acting as a server for a database the other new wireless iMacs connect to. Also, all the machines need access to the connected network printers connected in various parts of the office.
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maxyourmacs, Welcome to the discussion area!
I am wondering if I should turn off IP distribution on the Airport Extreme and let the Linksys router handle all that?
Yes
The software that the other wireless iMacs run to access the database on the server depends on the server IP address too, so will this need to be changed if the Linksys is handling IP addressing?
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