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Thread ID: 81343 2007-07-24 22:37:00 Double NATs? SurferJoe46 (51) Press F1
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572332 2007-07-24 22:37:00 I assume that I am behind a NAT, which I also assume is like a firewall with floating IP addresses..right?

I also am laboring under the impression that the NAT is in my Linksys router...is that right?

Can one use a multiple NAT? Do they interfere with each other? Am I going crazy here?

Here's the problem:

Verizon (spits on ground) says they want to put me on a new DSL modem...the old one is somehow RFI sensitive. They say my daily breakdown in service is from outside radio interference of some sort...but I don't really believe it after the discourse with intelligent persons here a while back.

My loss of connectivity and sync happens daily at about 06:16 to 10:00 M-F and now is coming up on Saturdays too.

OK..I put it on, get it all tuned up and then try to install my Linksys router..and I get shut down.

Running the Linksys installation CD I get as far as the test for the network connection and then I cannot go any further as it says I am not connected...but I was before the CD was run.

The Modem they want me to run is a Westell ADSL2+ NAT Combo unit without any router built in.

I have been successful for over three years with the Westell WireSpeed unit without a hub too...therefor the Linksys unit for all the other puters.

This "+NAT" thing has me spooked.

What's happening?

XP-Pro/SP-2, AMD Athlon XP 1.5, Windows OWN firewall, lots o' RAM, many HDDS and..well youse guys know what I'm trying to do.

This is not my server tower I am talking about here. That's just humming away in the closet running well on Mepis..but don't ask me how.

I have tried all my other other modems and always scurry back to the older Westell Wire Speed one..but it takes a lot of work to get it up and running after I bollix up the settings.

Getting very tried of resetting it back to original when I can't get this sorted out each time.

BTW: Everything's hard-wired...no wireless here.
SurferJoe46 (51)
572333 2007-07-25 04:03:00 BUMP! C'mon...I think this is a good question here SurferJoe46 (51)
572334 2007-07-25 04:08:00 BUMP! C'mon...I think this is a good question here

Thats probably the problem! :D I havn't a clue sorry....
wratterus (105)
572335 2007-07-25 09:14:00 NAT works by the router/modem facing the outside world and uses the IP assigned by your ISP. It gives all the computers attached behind the router/modem an internal IP number. Basically.

As for your question, let me rephrase it:

The new ADSL modem only has a single port (room for one PC)
The existing ADSL modem/router has more than one port

You want to continue to be able to hook up more than one PC, so you want to:

WWW --->New ADSL modem ---> existing ADSL modem/router ---> PCs

Is that right?
Jen (38)
572336 2007-07-25 09:24:00 WWW --->New ADSL modem ---> existing ADSL modem/router ---> PCs


That is using the existing ADSL modem/router as a switch.
johnd (85)
572337 2007-07-25 09:31:00 That is using the existing ADSL modem/router as a switch.Yes. That is what I am trying to work out if Joe is wanting this or trying this when he gets his problem. Jen (38)
572338 2007-07-25 10:33:00 That is using the existing ADSL modem/router as a switch.

In which case he will have to turn DHCP off in it. Easier just to buy a 5 port switch for a few dollars and put that in to give multiple PCs access to the DSL modem.
decibel (11645)
572339 2007-07-25 14:03:00 If you linksys router has NAT as well then i'm guessing that it is an ADSL router? whats the model?

Try what jen says however if your linksys is not an ADSL router but just a router with a four port switch built-in then you will need to hook up the Westell ADSL2+ modem to the WAN port of the linksys. Also another issue could be maybe that the Westell ADSL2+ has the same ip address as the Linksys router.. that is that could be both be set to for example 192.168.1.1, you will need to log into one of them and change this to a different address if this is the case.
Mamaz (10231)
572340 2007-07-25 15:21:00 OK . . . here's the situation .

I got two new modems from Verizon


1) Just a WESTELL Inc, Verizon ADSL2+ NAT COMBO 0/35 PPPO modem with the pair of in and out recepticals plus a USB port but NO router ports .

2) And a Verizon Wireless DSL Modem/Router Mod# GT704WG, and it has the required four ports for other puters plus USB and/or CAT5e from the NIC . It also has a removable antenna which I will remove . . . . and did, but I get hacker traffic on it instantly anyway in my neighborhood .

Neither of the modems are happy with my system . I need to have the hub for the media network that I am running on Mepis, and the other two puters (this one and a Dell) at the same time . That makes a total of three puters and one is on LAN Wakeup .

I tried to run the other two modems; the one without the router built in will not run with the Linksys BESFR41 at all, this is the one with the NAT designation . I can get it to work once, but on reboot, it resets the IP to default and then I have to go thru the whole thing all over again .

The one with the router/hub built-in gets hit with drive-by traffic even with the antenna off . . . but I haven't covered the walls of this room with foil . . YET!

I have another pair of modems, and one is a Linksys, but I quit running it a few years ago for one reason or another . . . which I cannot remember right now . . so I might try it again just for giggles .

The other is a left-behind router/modem with WIFI in it, but can be turned off if I can get to it fast enough .

Guess what Verizon "tech service" advised?

They said to take the new wireless modem/router to a different computer and set it up there and bring it back to my system and try it again . Yeah . . sure! Like that's gonna work!

I swear that the Verizon techs are living on the moon eating blue cheese crackers sometimes .
SurferJoe46 (51)
572341 2007-07-26 02:45:00 Joe, you are trying to drive down the Internet Highway in a 12-wheeler with dual control, and two drivers with different destinations in mind .

You need: one modem, one router, one DHCP server, one NAT server, and one switch . You can get that by turning off all unneeded services in the two boxes you have .

That is a sensible suggestion . : use one computer plugged into each modem/router in turn to set it up to have only the services you need enabled . Other computers connected in a LAN might just confuse things more . (An ADSL modem/router I was looking at today has a "CLI" socket for a terminal to do the setup . )

I''d probably be inclined to do what Verizon wants: use the new modem for all the services, and use the old one as a switch only . Make sure you use a non-default I address on that old one so it doesn't collide with the new on when being setup . (As a switch it doesn't need an IP address; it's just a switch . You do need a unique( local) IP address to set it up) .
Graham L (2)
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