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ldavisfl
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PostPosted: Fri Jun 03, 2005 2:02 pm    Post subject: VT1000V DHCP/NAT functionality, IP Address pool Reply with quote Back to top

I have a Motorola VT1000V adapter/router that I want to put in front of my Netgear RP614V2 router. Through experimentation, I have determined that my audio quality is better (less stuttering and crackling) if the router is NOT behind my router, but is instead plugged right into the modem.

The VT1000V has no problem acquiring an IP address and DNS info from my ISP (Comcast). I have the VT1000V's DHCP/NAT functionality enabled. Because Comcast limits me to one (and only one) issued IP (without paying extra, that is), I need the VT1000V to serve out IP addresses to the downstream devices on my network.

I've read somewhere on this forum that the Motorola VT1000V has only one address (192.168.102.100) in its DHCP address pool.

IS THIS TRUE?

In theory, one should be able to connect a dumb hub to the VT1000V and have various devices access the VT1000V trough this hub, each getting its own unique IP address. It doesn't make sense to me that there is only one device permitted, and that this device will always be assigned 192.168.102.100. Motorola's own product sheet on this device states that "many users" can share the internet without getting a seperate router.

Assuming the VT1000V actually assigns IP addresses to multiple devices (as DHCP servers are supposed to), does anyone know the range of addresses issued? Is it .2 through .256? Are the IP addresses issued in sequential order? I've tried to find any info on this but all Motorola's literature on this product is dumbed down and Vonage FAQs just keep telling everyone to reset their adapters (it seems to be their answer to everything, doesn't it?).

Anyway... thanks if anyone can speak to any of these questions.

(1) IP address pool: Is there really only one address available?
(2) IP address range is not user settable, so what is it actually?
(3) In what order does the VT1000V issue addresses?
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paul248
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PostPosted: Fri Jun 03, 2005 3:07 pm    Post subject: Reply with quote Back to top

Even if the VT1000V only gives out 1 IP address, just stick your Netgear router behind it, because the router only uses 1 address anyway.
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ldavisfl
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PostPosted: Fri Jun 03, 2005 3:58 pm    Post subject: Reply with quote Back to top

I have considered this possibility.

However, I want to turn off the NAT/DHCP in my Netgear RP614V2 router so that I will not have double NAT.

Once I turn this NAT/DHCP off, the router is basically a switch. Now, all my devices plugged into the router will each request their IP address from the Motorola VT1000V (correct?). Hence my original post; one IP address from the VT1000V is not enough.
It's hard to believe that the VT1000V's DHCP would be designed to dole out just one IP address. I was hoping to get some info here from a Vonage technician to minimize the inevitable experimentation.
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paul248
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PostPosted: Fri Jun 03, 2005 8:22 pm    Post subject: Reply with quote Back to top

http://broadband.motorola.com/consumers/products/VT1000/downloads/VT1000_User_Guide.pdf

That documentation recommends connecting the unit ahead of a router, although it doesn't explicitly say that it won't dish out more than one IP address.

If you really want to know what it does, try it and see what happens. If it doesn't provide more than one DHCP address, then see if you can use static IPs instead.

If you do end up using double-NAT, then I'd recommend putting your router in the VT1000's DMZ. That way, all non-voice traffic will show up at the Netgear router, and setting up stuff like port forwarding will be simpler.

I personally would recommend the double-NAT idea. It looks like the VT1000 was designed to be a Voip gateway and QoS-er, and not much else-- it's a simple device with one simple purpose.
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ldavisfl
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PostPosted: Sat Jun 04, 2005 1:50 pm    Post subject: VT1000V serves out multiple IP addresses Reply with quote Back to top

To clarify the abilities of the Motorola VT1000V, I removed my Netgear router and replaced it with a simple Linksys hub I had lying around. I plugged several devices into the hub, and each device was able to get a unique IP address from the VT1000V, starting with 192.168.102.100 and going up sequentially. So, whoever originally wrote that the VT1000V has only one IP address in its address pool was uninformed.

In addition, I also discovered that the VT1000V will accept devices with fixed IPs. My airport express needs to have a fixed IP address because it's a network print server. Various PCs need to rely on it having a consistent IP so they can print. I set the Airport Express manually to have a fixed IP of 192.168.102.200 (easily remembered) and restarted it. The VT1000V accepted the Airport Express at this IP address.

So, for now, I have removed my Netgear router and am just using the hub. This means I lose the router's SPI (Stateful Packet Inspection) which as far as I can determine, the VT1000V does not have. I'm not really happy about this.

The previous poster suggested going with the double NAT. I am not a complete expert on this, but I've read nothing good about double NAT. Doesn't this cause all sorts of problems? Slow performance? Port forwarding nightmares? Or, is this a complete myth?
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paul248
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PostPosted: Sat Jun 04, 2005 2:32 pm    Post subject: Reply with quote Back to top

You can get rid of the port forwarding headaches caused by double-NAT if you put the second router in the DMZ of the first. Essentially, the first router lets everything through, and the second does all the filtering and forwarding.

The extra hop can make stuff go slower, but it's probably on the order of a few milliseconds. Once again, the best way to find out for sure is to try it.
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