Before we go any further, let's make sure we're talking about the same IP numbers.
1. There is an IP number assigned by your Internet Service Provider, often called the WAN (Wide Area Network) IP number. If you have two providers, as you apparently do, you would have two WAN IPs ? one for Cable and one for DSL. Assuming you have connected one of your routers to the Cable connection and one to the DSL connection, there should not be any conflict with the WAN IPs ? each would necessarily be different. 2. Then there are the IP numbers used by your router(s). Let's call these the LAN (Local Area Network) Router IPs. It looks as if Apple's Airport uses the IP number 10.1.1.1 as the default for its routers (most non-Apple wireless routers use 192.168.1.1 or something similar as Router IPs). 3. And then there are the IP numbers assigned by your router to the computers (or other devices) it finds. These will be in the same range as the Router IP ? so that, if your router has the IP 10.1.1.1, it will assign IPs to local devices of 10.1.1.2, 10.1.1.3, etc. (assuming you are using DHCP and NAT to assign IPs to local devices). I think the fact that you have two wireless routers presumably trying to share the same LAN Router IP of 10.1.1.1 is the source of your problems. I have a situation where I have two routers providing DHCP to devices on the same network ? one is wired, the other wireless ? and I had to change the wireless Router IP to something different than the wired one. (Both were set by default to use 192.168.1.1. I was able to use the router's built-in Web interface to change one of them to 192.168.2.1 and that allowed me to use both on the same network.) I think you will need to do something similar with one of the Airport routers. I've never used its Web interface, so I don't what it's settings look like, but I suspect there will be a way to change one of the routers to, say, 10.1.2.1, so that it will then assign its DHCP addresses in the 10.1.2.x range while the other assigns them in the 10.1.1.x range. You will almost certainly have to turn one of them off while you make that change. In the foregoing, I've made several assumptions about Airport routers that may not be true, so someone with more knowledge of that particular router might verify or alter my assumptions. If this works, you should be able to have each computer choose which Airport it wants to connect to and there shouldn't be any conflict between the two. > Need help from one of the smart ones.... > > > With all the unbelievable problems with Insight I had to install a > backup source for getting online, so I installed a DSL line, to > give added protection I put it behind an Airport Express router, as > I already had done with Insight. > > So I am running two Airport Express routers, named them each > differently, put them on the network and by golly it works > unbelievably well, this blew me away for this would have taken a > degree had I tried to get all this to work under Windows I am > convinced. > > I have one problem when I put one of the computers on DSL and the > others are on Cable, the two routers are wanting to use the same IP > addresses, thus shutting down the DSL for it was wanting the same > IP address that was already in use by the Insight router. > > When I open the Airport Admin utility I find that once I am logged > in I can click on the "network" tab and there I have an option for > "share a range of IP addresses" which is dimmed, and the "share a > single IP address (Using DHCP and NAT) is what is highlighted. > > So, can I get around my problem by selecting the cable network > (since this say using DHCP) I assume I can't use this with the DSL > line, or is DHCP for the router and has nothing to do with Cable? > > If I do select the range, what numbers do I type in there? Below > is the wording of the error that appeared on screen as DSL was shut > down. > > The IP configuration that showed as an error read: 10.0.1.3 in sue > by 00:11:24........DCHP Server 10.1.1.1 > > Most likely I have not explained this well, but someone out there > my still be able to understand what is going on and what I need to > do for correction. > > Many thanks, > > John R. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.math.louisville.edu/pipermail/macgroup/attachments/20060513/3df721fe/attachment.html
