The Motorola CPEs act as network gateways, they connect to the Wimax network and do NATing for you. That’s nice for a home network, less stuff to configure and less clutter.

The indoor CPE worked well when it had coverage, but when I switched to the CPEo 400 I started running into all sorts of problems; DHCP and DNS stopped working, Connection drops, signal losses, and CPE restarts for no apparent reason.

Calling customer care for a week didn’t help, as you know it’s useless if your problem is a bit different. Oh believe me, Orange’s customer care is much worse, at least with Zain they tell you if they’re experiencing technical issues, with Orange it’s always your indoor wiring.

Turns out there are some bugs in the OS running on the CPE, I’m assuming it’s some sort of Linux distribution gone horribly wrong (Software version 02.01.90-02/11/2009). If you turn on UPnP all Hell breaks loose. I thought I should share this because of the lack of documentation and support for this particular unit.

You have 2 solutions, choose whichever fits your technical skills and/or your time.

Solution 1 (simple): This was the first one I went with, just connect the CPE to the WAN port of your aDSL router. Configure a static IP address and DNS on the router so it won’t use the CPE and use that IP as the DMZ. This will have the CPE forward all traffic to the router and have the router handle all the UPnP issues. This, however, you’d end up with double NATing, something not everybody likes.

Solution 2 (A bit technical): Install dd-wrt on your aDSL router and have it take of DHCP and DNS, then configure the default gateway as your CPE. You won’t have UPnP here but you can set up port forwarding on the CPE which should work fine.

Today when I rebooted to my Windows installation which I very rarely do, I noticed that browsing under Windows feels much faster than under Ubuntu. After booting back to Ubuntu I noticed the “looking up domain.tld” part was taking a lot of time, which seemed a little odd.

Anyways, after some googling I found out that Debian enables IPv6 by default and uses that before and uses it before IPv4. A quick remedy was:

sudo vi /etc/modprobe.d/bad_list

#Add this line
alias net-pf-10 off

After which you should reboot your system. Now browsing feels much faster. To speed it up a little I installed a local caching DNS server which works like a charm. A quick HOWTO can be found here

Hope this helps.