Author Topic: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100  (Read 12369 times)

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Offline 610Alpha

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I am helping a friend setup their router so they can do port forwarding.  I have done this on my own router but the thing I am puzzled by is that their WAN IP address is not their WAN IP address it is a 192.168.15.100 (private IP) that is being given to the Router from the Modem.  I looked into what you had to say about a 2 router setup but the Modem doesn't have the option of putting an IP address in the DMZ so that won't work.

I know on the Router that the WAN IP should be the IP address of the modem, my friend and I have the same ISP so I am familiar with how this should work. 

The default gateway is 192.168.15.1 when it should be the ISP xxx.xxx.xxx.1

I don't have this specific model so I don't know what all it has in it.  Do I need to change the WAN IP to what the Modem has?

In my setup I have a virtual server rule that listens for traffic on a specific inbound port and forwards to a specific static IP:PORT.  I just use the WAN IP:LISTENING PORT to connect to the STATIC IP:DEST PORT.  But my router has the WAN IP as the actual WAN IP not an IP given to it from the modem. 

Here is an image of the router wan settings:

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Offline Shane

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #1 on: July 26, 2011, 12:32:38 PM »
The default gateway is the IP of the modem. so try http://192.168.15.1

Once in the modem see if it has a DMZ page, if not find the port forwarding page.
Make 2 big port forwarding rules from 1000 - 65500 TCP & UDP
Have both rules point ot the WAN IP of the router, in this case 192.168.15.100

So outside connection comes in, modem sees it and because of the rule sends it to the router. The router gets the connection checks its port forwarding rules and forward the connection to the computer :wink:

Shane
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Offline 610Alpha

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #2 on: July 26, 2011, 01:08:50 PM »
I will have my friend check on this.  From what I saw in the user manual there wasn't anything about DMZ or Port Forwarding.

Offline Shane

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #3 on: July 26, 2011, 02:41:00 PM »
Have him log into it and check. Hopefully the ISP hasn't blocked all those :wink:

Shane
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Offline 610Alpha

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #4 on: July 28, 2011, 07:20:02 AM »
Well he couldn't log in.  Do you happen to know the default user/pwd for the Motorola Surfboard SB5100? or Does Comcast play big brother and lock you out of it?

Offline Shane

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #5 on: July 28, 2011, 09:51:41 AM »
Odd, I thought the SB5100 was a modem only and not a router as well. Yet his router shows it is getting a local address and not a wan address.

Something isn't right. Can you check and make sure on what is all hooked up :-)

I want to make sure we don't have another device hooked up in the mix.

The SB5100 normally logs in with 192.168.100.1

Again it should be a modem only.

Shane
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Offline 610Alpha

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #6 on: July 28, 2011, 11:40:41 AM »
The IP address to the Web interface of the Modem is correct.  Its just that the Modem Website address is also the WAN IP of the router when the WAN IP should actually be a public IP address instead of the Modem Website. 

What's even more odd is the DNS address (public IP) for the router is what I believe to be the actual WAN IP address being issued from the ISP to the modem (he and I have the same ISP and this address starts off in the same range as mine).  I personally have my DNS address on my home router set to the Google public DNS addresses.  I will most likely have him change his DNS to the Google public DNS.

It was a user authentication to the modem that was the issue. 

I found 3 possible user/password combos for this modem and he will try them out.  Hopefully 1 of the 3 combos will work for him to login to the Modem and poke around. 

Offline Shane

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #7 on: July 28, 2011, 11:55:38 AM »
If all you have is the modem and the router then lets try something.

The modem will only give out 1 internet IP address. If it is already given it out it will give a local address instead. To clear that the modem needs to be power cycled.

So try this, unplug the power to both. Then plug the power into the modem, wait till all the lights are solid and it is back up, then plug the power to the router back in.

Wait till the router comes online, then log into the router and check its WAN ip again :wink:

Shane
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(About Shane)
Site Owner, Top Admin, Lead Programmer, Wife & 5 kids, Needs a lot more coffee.

When people ask "Why fix what isn't broken?" I reply "To make it better."
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Honor & Respect is all that matters.

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Offline 610Alpha

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #8 on: July 29, 2011, 07:50:33 AM »
The modem/router does have port forwarding but I don't need quite that range so I will specify only one port number to forward to the 2nd router and on the second router i will specify the port redirect and to which pc.  I'll keep you posted on this.  Thanks for the help!!

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Re: WAN IP question for F5D8236-4 v2 (01) & Motorola Surfboard SB5100
« Reply #8 on: July 29, 2011, 07:50:33 AM »

 

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