2Wire modem giving me wrong IP address

Teacher

2Wire modem giving me wrong IP address

[ Edited ]

Hi -

 

I don't know what I did to cause this, but one of the systems on my home network is no longer getting the 192.168.1.NNN IP address. Instead, I'm getting assigned my public IP address, which causes problems getting to this system from other machines on the network.

 

Any ideas? I've rebooted with no change in results. Thanks for any ideas.

 

EDIT: the system in question is a Mac, running 10.6. It's worked with 2Wire for ages.

Message 1 of 12 (4,803 Views)
ACE - Master

Re: 2Wire modem giving me wrong IP address

What modem do you have?

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Message 2 of 12 (4,771 Views)
Professor

Re: 2Wire modem giving me wrong IP address

What do you mean Public IP address? You are not using a Time Capsule behind the 2Wire per chance, are you?
________________________________________________________________

"Ren: Now listen, Cadet. I've got a job for you. See this button? Don't touch it! It's the History Eraser button, you fool!

Stimpy: So what'll happen?

Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?"
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Message 3 of 12 (4,767 Views)
Teacher

Re: 2Wire modem giving me wrong IP address

2Wire modem.

 

By "public IP," I mean that it's the broadband IP address (in my case, 75.NN.NN.NN), not a 192.168.1.NN.

 

No, no time capsule.

Message 4 of 12 (4,764 Views)
Professor

Re: 2Wire modem giving me wrong IP address

Then it may be a issue with the IPTables on your computer, not with the router. What 2wire modem do you have?
________________________________________________________________

"Ren: Now listen, Cadet. I've got a job for you. See this button? Don't touch it! It's the History Eraser button, you fool!

Stimpy: So what'll happen?

Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?"
________________________________________________________________
Message 5 of 12 (4,759 Views)
Teacher

Re: 2Wire modem giving me wrong IP address

The model on the front says "3801HGV."

 

What/where are the IP tables? That's not a term I'm familiar with.

 

And, again, all the other devices on the network have "good" addresses.

Message 6 of 12 (4,757 Views)
Highlighted
Professor
Solution
Accepted by topic author mzimmers
‎09-30-2015 1:39 AM

Re: 2Wire modem giving me wrong IP address

IPtables is used by linux systems such as MacOS for how it handles firewall, etc. Now the other thing I can think of is that computer got placed into DMZPlus on the 2wire device.
________________________________________________________________

"Ren: Now listen, Cadet. I've got a job for you. See this button? Don't touch it! It's the History Eraser button, you fool!

Stimpy: So what'll happen?

Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?"
________________________________________________________________
Message 7 of 12 (4,747 Views)
Teacher

Re: 2Wire modem giving me wrong IP address

It was in fact in DMZPlus. I just changed that (hopefully I can live with that change) and renewed my DHCP lease, and I now have a good address! Thank you so much.

 

A couple of post-mortem questions, please:

 

1. why does DMZPlus affect this?

2. why didn't it affect the other systems on the network?

3. is returning to maximum protection going to affect my ability to file share within the network, or does it just effect traffic outside my LAN?

 

 

Message 8 of 12 (4,742 Views)
Guru

Re: 2Wire modem giving me wrong IP address

1. All inbound traffic, except traffic which has been specifically assigned to another computer using the "Allow individual applications" feature, will automatically be directed to this computer. The DMZplus-enabled computer is less secure because all unassigned firewall ports are opened for that computer.

Note: Once DMZplus mode is selected and you click save, the system will issue a new IP address to the selected computer. The computer must be set to DHCP mode to receive the new IP address from the system, and you must reboot the computer. If you are changing DMZplus mode from one computer to another computer, you must reboot both computers. The new IP address you aquire is the RG's public IP address so it can be seen to the outside world.

2. Other systems simply have a 192.168.1.x IP (unless otherwise specified) and communicate with the RG as normal.

3. It will not affect your sharing speeds on the LAN, simply from the LAN to the WAN and vice-versa.
Message 9 of 12 (4,734 Views)
Professor

Re: 2Wire modem giving me wrong IP address

dmzplus basicilly opens the firewall for a device.
________________________________________________________________

"Ren: Now listen, Cadet. I've got a job for you. See this button? Don't touch it! It's the History Eraser button, you fool!

Stimpy: So what'll happen?

Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?"
________________________________________________________________
Message 10 of 12 (4,734 Views)
Teacher

Re: 2Wire modem giving me wrong IP address

Hi, bauwls...thanks for the reply. I think a minor correction is in order: on the Mac, I don't have to reboot; I can just renew the DHCP lease (at least that worked this time).

 

So, if no computer has DMZplus enabled, does that mean that the 2Wire does all the routing itself? I'm still trying to grasp the concept/benefit here.

Message 11 of 12 (4,730 Views)
Professor

Re: 2Wire modem giving me wrong IP address

For the private Lan. Otherwise the computer is doing the routing. That is where IPtables comes into play. For more info, you can do a search on the web regarding.
________________________________________________________________

"Ren: Now listen, Cadet. I've got a job for you. See this button? Don't touch it! It's the History Eraser button, you fool!

Stimpy: So what'll happen?

Ren: That's just it. We don't know. Maybe something bad, maybe something good. I guess we'll never know, 'cause you're going to guard it. You won't touch it, will you?"
________________________________________________________________
Message 12 of 12 (4,721 Views)