Port Forwarding Problems on Netgear Nighthawk R6700

[evmoore]

I've been trying to forward ports on my Netgear R6700. V1.0.1.16_10.0.30

I have an Arris 6183 modem.

After playing around for several hours last night I managed to get it to work, but I had to check "Default DMZ Server" and then manually set an IP address. However, when I turned my computers on tonight when I got home from work, none of them could connect to the internet. I could not even connect to the router with the 192.168.1.1 login. I wound up having to reset my router completely to reestablish internet service. I'm now afraid to select "Default DMZ Server" box again.

One of the problems I seem to be having is that my 3 computers are randomly assigned IP addresses each time I turn them on. I need these ports specifically for a program I run on my laptop computer.

The ports I'm trying to open are 1700 and 1800.

NAT Filtering = Open
UPNP = On

Under Advanced I've selected Port Forwarding tab. I have the box checked for Port Forwarding (not port triggering) and typed in 1700 for external and internal. And 1800 for external and internal. For Internal IP address I chose 192.168.1.2 because that's the IPv4 address that was assigned to my laptop last night.

One of the problems I seem to be having is that my computers get randomly assigned IP addresses each time I turn them on.They vary between 192.168.1.2, 192.168.1.3 and 192.168.1.4

I've tried testing the ports on canyouseeme.org but I always get the fail message.

Any help would be appreciated.

[evmoore · Accepted solution]

I managed to get the ports forwarded in the past few ago (finally). Thanks everyone for the assistance.

[ElaineM]

Welcome to the community, @evmoore

You may use Address Reservation feature on the router if you want those computers to have a static IP address assigned to it.

See the link below on how to configure Address Reservation. 

How do I reserve an IP address on my NETGEAR router?

[evmoore]

That was a small part of my question that was answered - but not the question involving the core issue - which is why the ports won't forward, and how to fix it so they do.

[StephenB]

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@evmoore wrote:

That was a small part of my question that was answered - but not the question involving the core issue - which is why the ports won't forward, and how to fix it so they do.

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What device is between the router and the ISP network?

[evmoore]

You're referring to the modem? Arris 6183

[StephenB]

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@evmoore wrote:

You're referring to the modem? Arris 6183

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Yes.  I wanted to confirm that it wasn't a gateway (which it isn't).

Also, does the router's internet IP address look like 100.x.x.x?  

192.168.x.x, 10.x.x.x, 172.16.x.x - 172.31.x.x are all private addresses (and you'd see one of those if you were using a gateway).

100.x.x.x isn't exactly private, but it is reserved for Carrier NAT, so it's not a public internet address either.

[evmoore]

Where am I supposed to look to see this? I dialed into the Arris modem, but I don't see much listed for configurations.

Under Addresses Tab is says  6c:ca:08:70:58:7c and 10:da:43:8d:07:c4

[evmoore]

Sorry, you were asking about the router.

No, the internal IP address isn't 100.x.x.x or anything like that

[schumaku]

No, the question was about the public / WAN / Internet address.

Click the "Internet" button on the Basic Home ...on Basic -> Internet you find the currenty typically ISP assinged public IP address:

 

Carrier grade NAT range (RFC6598 - IANA-Reserved IPv4 Prefix for Shared Address Space would be 100.64.0.0/10 resp.100.64.0.0 - 100.127.255.255 to be exact.

[evmoore · Accepted solution]

I managed to get the ports forwarded in the past few ago (finally). Thanks everyone for the assistance.