AT&T "microcell" (femtocell) device passes-thru a public IP? How?

Ichinisan

Lifer
Oct 9, 2002
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Anyone else have one of these?

I installed my AT&T Microcell at my mother's home. It took AGES to come up. I had to tape it to the window temporarily so it could get a GPS fix.

I spend all day at work telling customers (over the phone) how to connect their network equipment, and I had no trouble connecting it. I was immedicately critical of the vague label for the WAN / Internet port, which is labeled simply "Ethernet." The LAN port is labeled "Computer" (aren't they BOTH technically "ethernet" ports?!). I reset the Linksys cable modem (used w/ Charter Communications) because I believe charter has a CPE limit of 1 DHCP IP address.

To my surprise, my router keeps getting a public IP address from the behind the 3G Microcell device. It seems like the Microcell is doing some fancy NAT trickery in order to seem invisible. The Anandtech review indicates that they wanted to lock this down as much as possible...so I'm not surprised there. However, you can't log-in to it to configure port forwarding or anything. At first, I was convinced that port-forwarding was broken by this because I couldn't access the router's remote administration over port 8080...but I *can* still access the VNC server on my mother's computer over port 5099.

I'm actually pretty curious to know if the ISP sees the MAC of the router, behind the AT&T device.

Anyway, even though it finally seemed to get a GPS fix and come online after several hours, I quickly learned that something was really wrong w/ the GPS. Out of curiosity, I launched Google Maps on my iPhone and it keeps finding me in South Carolina somewhere instead of Newnan, GA 30263!
 

notposting

Diamond Member
Jul 22, 2005
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Hmm, our Samsung VZW network extender does pull an IP from our router but doesn't show on the network otherwise. Why wouldn't you just put the Microcell after the router anyway?
 

Ichinisan

Lifer
Oct 9, 2002
28,298
1,235
136
Hmm, our Samsung VZW network extender does pull an IP from our router but doesn't show on the network otherwise. Why wouldn't you just put the Microcell after the router anyway?

Because I would then need to configure QoS in the router to ensure that voice traffic is correctly prioritized. I've never trusted the QoS feature of any router because I've observed it having the exact opposite effect than what is desired / expected.
 

notposting

Diamond Member
Jul 22, 2005
3,498
33
91
Steve would at least use the correct form of your/you're when he's being obnoxious.

Apple PR: that post never happened, and it wasn't Steve.

Also, crap, you're right. And it was only 8pm so I can't say it was late at night. Damnit. I use pfsense for routing and the QoS is pretty good for me anyway. Understand your point though, and I guess if it works...it works, right? :)