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ChrisLewis
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Joined: Mar 27, 2007
Posts: 4

PostPosted: Tue Aug 07, 2007 7:53 am    Post subject: VT2542 installation behind Router Reply with quote Back to top

OK -

I've just gotten my second Voip router for lines 3 and 4, and its a VT2542.

What I have is

Code:

Internet->Old R-> LinkSys Voip
             |
             +> VT2542 Voip


Set it up similar to my Linksys, but for some reason, if I connect to the WiFi on it, it doesn't hand out a routeable IP address. I can't ping 192.168.0.1.

IP of Router: 192.168.0.76
Mask: 255.255.0.0

LAN IP of Router: 192.168.16.1
Mask: 255.255.255.0

I've set up DHCP relay, but it doesn't seem to be working.

And for some reason, whenever I try to change the IP of the LAN (to 192.168.0.21/255.255.0.0 to put it on the same sub-net+gateway) I don't seem to be able to change it, and I get an error:

SUBNETS ARE MATCHING

so I'm quite confused.

I haven't called Vonage yet, probably will today.

I've looked at this thread on routing:

http://www.vonage-forum.com/ftopic15982.html

and this thread on the VT2442

http://www.vonage-forum.com/ftopic13841.html
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NateHoy
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Joined: Nov 01, 2005
Posts: 2257
Location: New England

PostPosted: Tue Aug 07, 2007 9:39 am    Post subject: Reply with quote Back to top

OK, the way I see it, your Internet connection is handing out IP address 192.168.0.76, correct?

If that's the case, then you need to configure "Old R" to hand out addresses in a different range, which as I can see you have done. Your "Old R", if I am reading it correctly, is handing out 192.168.16.x addresses.

However, you CANNOT have 192.168.0.x ANYWHERE on your LAN, in any of the segments. Your connection to the Internet routes using that address, so if you try to make one of your segments use the same address, you will develop a circular route.

I'd pick different subnets for each of your routers, and accept the fact that each of them is going to be serving a different network and they are going to be unreachable from each other.

The assigned LAN addresses from your various connections should be as follows:

Internet = 192.168.0.x, you cannot change this, nor should you use it on your LAN.

Old R = 192.168.16.x, this works. The WAN addresses on the LinkSys and VT2542 are going to be 192.168.16.x

VT2542 = set this to 192.168.15.x. Any devices connected to this (including on the WiFi) are going to be part of their own separate network. and cannot be accessed from computers connected to "Old R" or the Linksys if applicable.

LinkSys = if this is a router, set it to 192.168.14.x - see note above on the VT2542 in terms of accessability of other LAN segments.

If you want one segment with all of your routers, then you have several options:

1. Put the VT2542 out front, and use it as your primary router. Either decommission the "Old R" or use it for things you want on a "more secure" segment not accessible from the Wireless.

2. Retool the VT2542 and/or LinkSys if applicable as a switch and wireless access point, by looking at Scenario Three in the article below:

http://vonage.nmhoy.net/tworouters.html

3. Connect all of your clients to the VT2542, that way all of the clients are on the VT2542's network, wired and wireless (but almost all of your traffic is then going to be routed through the VT2542).

_________________
Comcast Cable (3m down / 256k up) -> Linksys BEFCMU10 v2 (DOCSIS 1.0) -> WRT54G v4 ("Tomato" firmware) -> the rest of my network including a WRTP54G (Firmware: 5.01.04)
My Vonage Self-Help Guides: http://vonage.nmhoy.net
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kumakuma
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Joined: Jun 07, 2007
Posts: 63

PostPosted: Wed Aug 08, 2007 3:24 am    Post subject: Reply with quote Back to top

you cannot use 192.168.0.X as you LAN IP,it is a reserved IP for the network domain..your old router set the LAN IP to 192.168.15.1 and your NEW router's LAN IP to 192.168.16.2...in this way they will have different networks
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ChrisLewis
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Joined: Mar 27, 2007
Posts: 4

PostPosted: Wed Aug 08, 2007 9:51 pm    Post subject: Reply with quote Back to top

Well, first of all thanks for the replies.

My internet connection is handing out a routable IP address - 66.93.115.233, that is then multi-NATted into my 192.168.0.x/255.255.0.0 range by my Netopia DSL Modem/Router (Old R in the diagram above)

All connections to the internet go to the Netopia via a 24 port switch.

DHCP is handled by the Netopia Router (a netopia DSL modem/router) for the 192.168.0.129-254 range.

Since each of the Voip Routers WAN connection is actually connecting to the Netopa, the Voip WAN IP's are in the 192.168.0.x range

The Linksys is connected to the switch, and is programmed for WAN address 192.168.0.75 with its internal LAN IP of 192.168.15.1.

The Motorola is connected to the switch, and is programmed for WAN Address 192.168.0.76 with its internal LAN IP of 192.168.16.1.

From a node in the network (192.168.0.135) I can ping the following:
192.168.0.1
192.168.0.75 ===Linksys WAN
192.168.0.76 ===motorola WAN
192.168.15.1 ===Linksys internal LAN
192.168.16.1 ===Motorola internal LAN

So basically, I DON'T want to mess with the netopia, and shouldn't have to - it's doing its job quite nicely Smile

I don't want to plug anything into the Linksys - there's no need.

But because the Motorola is a WiFi access point, I want to utilize it's wifi, but have it assign an IP address within the 192.168.0.x range and issue DHCP relay for the 192.168.0.x range - in other words, act as a BRIDGE rather then a ROUTER.

Now some further information - I've set up a static route on the Moto of 192.168.0.1/255.255.0.0 via 192.168.16.1 and turned on the DHCP server on the moto for 192.168.16.2 through 192.168.16-254.

This *seems* to have fixed everything - I can obtain an IP (192.168.16.2) and ping the following:
192.168.16.1 ===Motorola internal LAN
192.168.0.76 ===Motorola WAN
192.168.0.1
www.google.com

It seems to me the static route *might* be unnecessary, since, by definition of being a router, that route should *already* exist.

I guess the Bridge/Router is my biggest question, and the fact that I can't DHCP relay is a bummer. Also, the fact that I can't change the LAN IP anymore is a little concerning, but, whatever...

PS
Here's the Route dump
Destination IP Mask Gateway Metric Delete
192.168.0.1 255.255.0.0 192.168.16.1 0
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habarama
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Joined: Aug 10, 2007
Posts: 7

PostPosted: Sat Aug 11, 2007 2:32 am    Post subject: Reply with quote Back to top

maybe I'm a little green but why are you changing the subnets? You have 255.255.0.0 on one and 255.255.255.0 on the other two...put 'em all on the same subnet and see if they'll all talk to each other then?
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ChrisLewis
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Joined: Mar 27, 2007
Posts: 4

PostPosted: Sun Aug 12, 2007 10:22 am    Post subject: Reply with quote Back to top

That's what I thought also, but it seems like there's no way to Bridge the WAN address onto the WiFi/LAN address range.

The GUI won't let me change the IP address of the LAN or the subnet.
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habarama
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Joined: Aug 10, 2007
Posts: 7

PostPosted: Mon Aug 13, 2007 1:35 am    Post subject: Reply with quote Back to top

I'll ask you the same question I've asked others with the wireless router. Which browser are you using? Neither the Motorolla's, Dlinks or the Linksys' like mozilla - if you're using it try explorer. If you're not I bet it's a firmware issue - call Vonage
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ChrisLewis
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Joined: Mar 27, 2007
Posts: 4

PostPosted: Tue Aug 14, 2007 11:40 pm    Post subject: Reply with quote Back to top

Browser is IE 7.

I'll give Vonage a call tomorrow to see if its a firmware issue.
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ofblong
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Joined: Jan 18, 2008
Posts: 1

PostPosted: Fri Jan 18, 2008 12:19 pm    Post subject: additional information Reply with quote Back to top

I have this problem as well that it says subnets are matching and then it reverts back to default settings. I can get the internet just fine BUT I cant get it to see the other computers that are on my Linksys router. Basically have cable modem to 4 port linksys which has 2 computers an xbox360 and then to the Vonage modem (vt2142). From there I goto my laptop. Like I said I can get internet but cant get the laptop to view the computers on the linksys. I tried changing the LAN ip but it reverts back.
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pri101
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Joined: Dec 30, 2006
Posts: 2

PostPosted: Tue Jun 17, 2008 2:27 pm    Post subject: LAN/WAN Subnets are matching Reply with quote Back to top

I'm having the same issue as ofblong. Does anyone have a solution or reason for the error.

My current setup:
ISP
|
Linksys WRT54g-->Desktop1
|
RTP300-->Laptop1


I cannot network Desktop1 and Laptop1 together. Changing the LAN IP on the RTP300 gives the error: "LAN/WAN Subnets are Matching" and then reverts back just like the previous poster.
Thanks in advance.
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