secondary dns question

Are you getting 192.168.1.x addresses.. if so the modem is working as router.. but how it was working to not give you a double NAT has me lost.. and I think Bob as well.. we have simply never seen a setup that works that way.

But that also is the kind of thing that will give you issues.. anyway see how it goes using the Modem as all dns is now going to be from the modem.

in bridge mode on my AE I *can* connect multiple clients...right now I have about 6 connected. The difference is on each device I no longer have the familiar 10.0.1.1 for router/dns settings, but the numbers coming straight from the modem. So the modem must be functioning as DHCP or??

The P-600 is a modem/router in its normal setup, as I mentioned before. It might look like a simple modem, but it is performing routing duties, even though it does not provide wireless service.

But I never did get this double-NAT error you mentioned before.

That is what I do not understand, since you would normally see a Double NAT when you have two routers on the same network both running DHCP and NAT.

Please let us know how things are working in a few days.

Thank you. This has been an informative discussion which I stumbled on somewhat by accident. Thanks to questioner and respondents alike.

Since you are on the topic... would someone mind giving a quick explanation of the trouble with Double NAT. I've had the warning pop-up in the past and just ignorned it without obvious issues. I'm planning a trace route as soon as I get home. 🙂

NAT acts like a firewall between your local network and the Internet, so having two devices both trying to perform routing duties on the same network can create some potential issues due to the extra firewall layer that the signal must negotiate.

Since the signal must negotiate more obstacles, it will slow down a bit with the additional NAT firewall. That slow down is usually not noticeable on most networks unless you are measuring signals using a utility.

Double NAT can also create browsing errors with the wrong site coming up, or some sites not coming up at all.

An online gaming console will not like Double NAT at all, making it difficult....if not impossible....to play interactively online.

Yet, Double NAT often does not cause any real issues at all on most simple home networks.

It's better...in my opinion....to avoid Double NAT if you can, but sometimes it is unavoidable with certain setups and connections.

Just to add to Bob's comment.

NAT is a trick to get the most out of the very limited IPv4 address space.. it means all computers behind a NAT router are not directly on the internet.. ports must be forwarded for the connection to work.

Ports are limited.. if you forward a port to one computer it cannot be forwarded to another. Since so much interactive stuff is now involved with the internet NAT becomes a big issue. Try running two games consoles on the same internet connection to see what happens.

When you have double NAT all port forwarding goes to .. a very dark and hot place!!

All automatic port forwarding, upnp or Apple's NAT-PMP will not work through double NAT. The port opening request cannot be sent to the second router.

Try running interactive games or voip or access cameras remotely with double NAT. All the protocols that depend on port forwarding will fail.