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I have a modem router (TP-Link TD-W8961ND) connected to the internet and working fine. It is broadcasting a wireless network and that too works fine.

I have a second modem router (Siemens SL2-141) functioning as an extender. It is wired to the first router and broadcasting a wireless network with the same SSID, same security, but on a different channel. DHCP and UPnP are disabled on the second router.

My iPad, iPhone, and Win7-based ThinkPad are all able to move between the two networks with no problems.

We also have a WinXP SP2 Netbook. When in proximity to Router1, this machine accesses the LAN and Internet with no problems. As soon as it gets closer to Router2, it picks up the signal and shows an "Excellent"/"Strong" connection but it can no longer see the internet. It can see Router2's config page and the other machines on the network but it cannot get past the router to the internet.

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you need to do some more test to see to what extent it can't "see the internet". Can you ping www.google.com for example. – barlop Sep 21 '11 at 21:08
If you don't have DNS service working correctly, you won't be able to resolve names like "google.com" in to IP addresses. Try pinging the IP 4.2.2.2 (some public DNS server).. – Doc Sep 21 '11 at 22:17
@Doc 4.2.2.2(BBN or something like that).. there's also 8.8.8.8(Google's) tummy.com/Community/Articles/famous-dns-server and even neater in terms of memorizing! or 8.8.4.4 and the opendns ones are 208.67.222.222 and 208.67.220.220 mentioned davidbau.com/archives/2006/05/06/memorable_dns_ips.html – barlop Sep 21 '11 at 23:08
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There's some good suggestions here: Multiple access points for the same SSID? Personally, I use three routers with a hard-wired backbone, all with different SSIDs and passphrases and on non-overlapping channels. Only the router connected to the internet is used for DHCP though. It's a more complicated setup but it works for me.

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