Manage Static IPS in VOIP Setup

July 21, 2011 at 10:40:21
Specs: Windows XP
I have VOIP and was provided a modem, a Tilgen Router (Vood 452_A). I also currently have a Linksys WRT54G router. I also have a home surveillance system with a DVR that can be accessed via the net. I am trying to allow the ports to open so that traffic can navigate down to the DVR.

My IPs:

My VOIP has provided me with 6 static IP addresses. For sake of this issue they are:, through .158

My subnetmask is set to:

My Settings:
The Modem is connected to world. To the modem I have the Tilgen Router connected. The Tilgen is set with an ip of .153 and the subnetmask listed above. DHCP is turned on and has IP range set for .154-.158. It is set in Bridge Mode with NAT and Firewall turned off. To that I have the WRTG54G router connected and assigned the router an Static IP of .154.. The cable is going into the Linksys WAN port.

From a computer connected to a LAN port on the WRT54G, I see my public IP as .154, currently my internal IP is so I believe I have to assign one of my Static IPs to this PC, however when I try to connect to the Linksys Router (.154) from the outside web, I am get a time out error. (also from a ping test.)

My thoughts are to assign the Linksys to DHCP and use a range of .155-.158 to give each lan item a static IP. My question is will this work? Will each item in the network have its own IP and if I forward the port to the DVR that i needed, ie 80 for web client or 6100 for desktop client, will that forward through?
Or do I set it to Router Mode and use the Tilgen to assign the ips.
On the Tilgen I also have an option for a DHCP relay or to turn off DHCP.

Hope this is explained well enough, let me know if I can provide any additional information
For clarification here is the setup chain
Broadband/DSL Line>>Tilgen Modem>>(LANPort1)Tilgen Router(LAN Port2)>>(WAN) Linksys(LANPort1)>>DVR/Computers

Edit: Found this walkthrough on setting the WRT54G into a Switch. If I did this, in theory the VOOD would assign those computers/dvr connected downstream via the WRT54G a static ip from my range set on the router. then in theory I would not need to port forward port 80 since the DVR would be on its own public IP.? Does this work as a solution?

****Edited to mask IP address****

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July 21, 2011 at 14:51:38
Why are you using routable IP's on your LAN?

Typically one uses a router and utilizes it's built in NAT service to allow for using private IP's on the LAN. Done this way, you only require one external (routable) IP and if you're paying more for the extra IP's, you could change your package to be only the single IP and save yourself some money.

Your connection between routers should be "LAN port to LAN port" unless you have need for a separate subnet. If you don't require a separate subnet then you would let your Tilgen router's DHCP provide IP's for all clients.

For info on how to interconnect the two routers, click on my name above in this response and read my “how-to” guide titled, “Add a second Router to your LAN

Pay attention to the scenario where you make the downstream router part of your LAN and interconnect the two routers "LAN port to LAN port"

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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July 21, 2011 at 15:14:10
why did they give you a router?
reason for a router is to do nat. you are not doing nat. you are only doing bridging.

you are using public ips. They should have just given you a switch.

You can't do port forwarding while bridging. There is nothing to forward since forwarding uses nat. Same is true for the linksys. No nat=no fowarding

if the dhcp scope starts at .154 you would not assign that ip to the linksys router or you will have a ip conflict on the net.

How many phones do you have? from your listed dhcp scope I am guessing 5.

Given your situation this is what it would look like:

modem<>switch<>voip phones w/static ips assigned
modem<>switch<>router doing nat<>forward to dvr private static ip
The router would have a public ip on its wan interface and its that ip plus port number you would use to connect to the dvr.

Normally it would look like this:

modem<>voip router doing nat<>voip phones with private static ips
modem<>voip router doing nat and port forwarding<>wireless switch<>private ip of dvr
router would be doing dhcp but the voip ips would not be in its scope

Did you talk to the voip provider concerning your requirement for DVR access via the internet?

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July 21, 2011 at 16:24:31
Hey guys, thanks for the prompt replies. Let me give a bit more background on the situation. I am a CCTV tech that is hired by my client to setup his DVR for remote viewing. I have arrived into the setup as it stands in my description. It appears looking at the previous VOIP techs notes, that the router was previous equipment that my client had.

They then added a Modem and the VOOD router in the backroom ran a ethernet cable from the LAN port on the VOOD to the WAN on the LINKSYS. My Client purchased the 6 IPs either for the phones or what not i am not sure but we have these public ips available. The idea is to get to the DVR.

I called the VOIP tech when I was unable to gain access to the VOOD for lack of credentials. They gave them to me and informed me that the VOOD was set in bridge-mode and that the Linksys is doing all the routing. However this is not true because I cannot access the Linksys behind the router from its WAN IP (.154)

After reading your comments and other threads on this site, I came up with a proposed solution. Set the LINKSYS in Switch mode (which saves me from having to run 4 cat5 cables to where it sits now). Let the VOOD assign IPs via DHCP and then just port forward on the VOOD to the Private IP of the DVR as though the Linksys does not exist.

But.. i just cant help but dream about instead of portforwarding, assign one of the public ips to the DVR and then just get to it by entering that IP and have it jump right to the DVR.

Also they have two phone nubmers that are managed through the VOOD in a settings menu Phone and plug into the Phone Jack on the back of the VOOD.

thanks again.

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Related Solutions

July 22, 2011 at 08:39:16
how many phones?
am I reading this right, they brought in a second wan link?

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July 22, 2011 at 14:24:33
how many phones?

Not sure how many phones, I only know that there are two phone lines (numbers) connected to the VOOD.

am I reading this right, they brought in a second wan link?

Not sure I understand, I assume he had some version of DSL or T1 going to the store. Then he wanted VOIP so they brought in a new modem and router. The system is setup in the back where his current router is placed in the front. The tech probably ran a cable over to the Linksys and used it to administer the DHCP requests out to the LAN.

I think I will put the VOOD into DHCP mode, remove Bridged Mode and then put the Linksys into Switch Mode by moving the connection from the WAN port to the LAN port. Then hopefully the VOOD will assign the Static IPs from the Router and if it doesnt work that way, Ill still just Portforward on the WAN IP that comes out of the VOOD to the DVR.

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July 22, 2011 at 14:35:19
If you take the router out of bridge mode the phones will stop working.

You can not have the public ip address on the wan and on the lan

Routers do not assign static ips. Only way you can do that is with mac address to ip address filtering [ip reservations] but again you can't assign those public ips to the phones because they are on the lan and you need a public ip on the wan.

You can not route with the same ip subnets on each side of the router.

We don't have an accurate picture of the present config. Anyway you can draw a diagram and post if for review of what you have seen?

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July 22, 2011 at 14:58:37
If you take the router out of bridge mode the phones will stop working.

Ok. I am not familiar with VOIP so this is good to know.

Network diagram the best I can tell from what I See

I was told by the tech the following "We dont mess with the router, we only set it in bridge mode and defined a subnet so that the router (Linksys) would act as the contring factor in this situation. We have the main router (Tilgen) set to bridge mode so that there is no config done there. Everything should be passing down to the Linksys. Why dont you go ahead and have the Linksys DHCP set to assign the IPS that we gave you (the public IPs) that way the systems will have them assigned and you can connect directly to them."

Most of what he said made some sense but then i started questioning his knowledge since he really had no idea what was going on. The tech that did the install originally (a few years ago) is no longer with the company.

I am set to go over there around 4:30pm PST, I hope to have a game plan by then but if not no worries.

Is there away to just turn the linksys into a switch, have the tilgen assign the IPs and just port forward as I would with one router? If I wanted to do that, could I with the phones also connected? NAT is turned off on the Tilgen...Here is a copy of the settings menu in the Tilgen if it helps.

Lan Configuration
Static Configuration

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