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#65618 by drdavedmin
Mon Sep 27, 2010 6:19 pm
From reading posts, it seems the best option for me, with an Apple Time Capsule, is to configure the Time Capsule (router) with a static IP address and put it in the Omma telo hub's DMZ. This assumes the Ooma is placed directily after the modem and before the Time Capsule router.

My question is what to put in the settings for the Time Capsule using the AirPort Utility (Internet - TCP/IP - Configure IPv4 Manually. Which setting there gets the static IP within the Oomas numbering range (172...) ?? :?:

Specifically, how do I set each of these choices: :?:
Ip Address
Subnet Mask
Router Address
DNS Server(s)
Domain Name

All except the DNS Servers are automatically filled in when I change the Configure IPv4 from "Using DHCP" to "Manually."
Again, which is the Time Capsule static IP setting, and do the others stay the same? And if Comcast changes any of these other settings, what then? ;)
#65633 by murphy
Tue Sep 28, 2010 1:57 am
Forget static IP configuration.
It's more trouble than it is worth unless you are a networking expert.

Set the start and end IP addresses in the Ooma DHCP table to 172.27.35.2.
Set the DMZ value in the Ooma to 172.27.35.2.
Leave the Apple in DHCP mode.
Since there is only one address in the DHCP table, the Apple will always get that address.
#66161 by drdavedmin
Tue Oct 05, 2010 9:45 am
Thanks for the ideas. In my case setting a single IP address in the Ooma DHCP settings, and the same address in the DMZ (for the Apple router) resulted in error messages in the Apple router, about having a double NAT system. While I was able to bypass it and have the Apple router assign IP addresses, surfing the Internet or doing email were all blocked. When I attempted to open a web page, I got the Comcast activation screen. Since this did not happen when I connected my computer directly to the Comcast router.

I finally gave up and did a hard reset on the Apple router, re-established my settings, and placed the Ooma after the Apple router. I believe this means that I cannot benefit from the QOS capabilities of the Ooma Telo, but at least it doesn't take down my network. I don't believe the Apple router is capable of setting up QOS for a particular device.

Is this likely a problem created because the Apple router needed a reset for some other reason? How do others handle the double NAT error? Would assigning the router a static IP eliminate this problem?

Would appreciate any assistance! :?:
#66162 by murphy
Tue Oct 05, 2010 9:59 am
Double NAT is not a problem.
It's safer than single NAT.
Apparently the Apple router thinks that it is a problem.
Can you configure the Apple router to ignore what it thinks is an error?
#66360 by drdavedmin
Thu Oct 07, 2010 3:19 am
You have been very helpful and I really appreciate it. The subnet thing you mention is very likely the problem. My router was already using the 172. series of IP addresses, which the Ooma also uses. I can reset my router to use a 10. series or a 192. series. Would that be likely to cure the issue?

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