Airport extreme won't work without router/switch

Hi all,
I'm a bit dumbfounded here and am hoping you can give me some answers. I've been having connectivity issues, specifically with random pages not loading while on wifi (all devices). They work just fine on my iPhone through LTE so I decided to try and isolate the issue to what hardware was causing my issues.
Previous setup:
Cisco DPQ3212 VOIP modem -> wired to legrand 10/100 router/switch (wired only) -> wired to Airport Extreme -> Airport Express (set to extend range).
I decided to try and eliminate the router/switch and start from scratch using only the modem and Extreme since that's the simplest setup.
I reset the Extreme to factory settings and unplugged it. Then I turned off the Modem (pulled power, etc.). I let both sit for a while to forget anything they may have been remembering. I then connected the ethernet, plugged in the modem, waited for it to get situated, and then plugged in the Extreme. Setup went fine, but I got 'no internet' and 'no dns' errors. Those went away randomly but the ip address I got was 169.xxx... so something was obviously was amiss.
I decided to go even simpler. Connected iMac directly to modem, reset the modem and voila, I had working internet. Thinking I did something wrong, I reset everything again and tried the Extreme setup. Same issue with connectivity. No internet and a bad IP. Tried the same thing with the Express and got the same errors, etc. Tried switching DHCP & Nat, Bridge Mode, you name it, nothing seemed to work. Airport utility shows green for the Airport but amber for the internet.
So I gave up. I connected the wired router/switch back up, reset everything, and it works again without a hiccup.
Summary:
1. Internet works when modem is connected directly to iMac.
2. Internet works fine connected wirelessly through Extreme (or Express) wired to the router/switch wired to modem.
3. Internet will NOT work when modem connected directly to Extreme or Express, despite factory resets.
So help me out... how can this possibly be happening????

Sorry for the super slow response. Shortly after posting the question my wife had a baby so I've been a bit preoccupied!
I'm using the following:
Airport Extreme: 5th Generation A1408 (version 7.6.4)
Airport Express: Current generation A1392 (version 7.6.4)
(if it matters) Legrand 10/100 4 port Router/Switch (http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CB8QFjAA&url =http%3A%2F%2Fwww.legrand.us%2F~%2Fmedia%2FE0E9D84B8E4E4F0EAF6DE2577C23AD7F.ashx &ei=x0rEU8aMHcnjoAT3qYCgBw&usg=AFQjCNGDfOvPP4Dd9k1Xx6FVDkNJi0DOrw&bvm=bv.7081008 1,d.cGU)
I don't have access to a plain switch or crossover cable unfortunately.
And yep, I'm using the WAN port. I get a green light every once in a while, but it really just doesn't work unless I add the other router back in there.
I have been taking the battery out and letting it rest for 30 mins each time.
FWIW, I'm doing all of this due to webpages not loading correctly. I did a trace route to discussions.apple.com and the results show something is obviously amiss. Here's what it says:
traceroute discussions.apple.com
traceroute to e4233.a.akamaiedge.net (184.84.157.54), 64 hops max, 52 byte packets
1 192.168.40.254 (192.168.40.254) 6.983 ms 1.503 ms 4.270 ms
2 * * *
3 24-234-16-181.ptp.lvcm.net (24.234.16.181) 18.210 ms 17.244 ms 15.563 ms
4 24-234-6-81.ptp.lvcm.net (24.234.6.81) 19.638 ms 22.093 ms 11.523 ms
5 24-234-6-254.ptp.lvcm.net (24.234.6.254) 12.806 ms 11.504 ms 10.715 ms
6 langbprj02-ae2.rd.la.cox.net (68.1.1.19) 35.497 ms 30.201 ms 29.679 ms
7 216.156.65.201.ptr.us.xo.net (216.156.65.201) 37.353 ms
216.156.65.25.ptr.us.xo.net (216.156.65.25) 21.546 ms 21.418 ms
8 * * *
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I gave up at this point since there's a clear issue.
Thanks in advance for the help!

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apikoros wrote:
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Airport extreme won't work without router/switch

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