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#53981 by jeremym
Mon Apr 26, 2010 7:39 pm
I am set up as Router --> Ooma --> Cablemodem --> Comcast

So, my "real" problem is that I want to use port forwarding and open up a port 45631/TCP.


So I go to and I see that my configuration says that it's the following (I've put in the X's for security sake):

MODEM: Connected : [76.117.X.X]
HOME: Connected : [172.27.X.X]

Turns out, I'm also using a Wireless+router+Firewall device NetGear-something-or-other and it's configured as and all the computers on the network (all of them, including computers, Tivos and other devices) are all 192.168.2.X.

Here's my question:

() I went to do a port forward of 45631 to on the OOMA device, and got (rightly) told that I cannot do this, since it doesn't know about the 192.168.2.X network.

() Is there any reason why I should NOT change the OOMA to or something similar?

() THEN port forward? Will this work?

() Is this the recommended way to -do- port forwarding from OOMA (172.27.x.x) to my 192.168.2.X .. or am I totally off in the weeds? (Note: I did the port forwarding ALREADY on the Netgear, and my port still appears closed.)

Obviously, I need my phone system to keep working... so I figured I would just ask before I did this first.

Thanks in advance.
#53988 by murphy
Tue Apr 27, 2010 3:24 am
You can not have the same subnet in two different devices (Ooma and router). It makes routing impossible.
There is no reason to mask your IP address. It is a private address just like the 192.168.x.x range. Every Ooma box comes with the same address.
Configure the Ooma box DHCP to issue exactly one IP address, ie. make the start and end IP addresses This guarantees that your router will always get the same address.
Put in the Ooma's DMZ entry.
Or leave the DMZ entry blank and forward port 45631 to
Do not do both.
Click the radio button that says to use the built in MAC address and then click update.
Also forward 45631 in your router to the device you want to access (192.168.2.x).
If you are using DynDNS, run their client on a computer that is on 24/7. You can't use the facility that is built into your router in this environment.

You can't test your port forwarding from inside of your network because the Ooma does not support loopback. Test from a computer that is outside of your house.
#53997 by murphy
Tue Apr 27, 2010 6:40 am
jeremym wrote:You are my hero.

Thank you. Got it.

Will now be able to watch movies on my iPad on the beach in Mexico.

Yippie! Thanks so much !

You're welcome.

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