Re: Accessing DSL Modem's web config from behind NAT router in Networking http://www.dslreports.com/forum/r22655071 en Tue, 09 Feb 2010 22:08:36 EDT Tue, 09 Feb 2010 22:08:36 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22702526 Bink : I don’t know if the Netopia can do this, but I have a bridged modem in front of my OpenBSD box/firewall and can access the modem via conditional NAT on the OpenBSD box—and I feel this is the best method for doing this as it does not require any special configuration on the modem. Even though my modem is in bridged mode, it still has an IP—and I have my OpenBSD box configured in such a way that if traffic is going out to the Internet, the OpenBSD box NATs my IP out the public IP, but if traffic is destined to the private subnet between the OpenBSD box and the modem, my IP is NATted out the private IP that’s in the “modem” subnet. With this configuration, I can fully access the modem from any system on my LAN—and do not need to create a route on the modem that points back to the LAN to do so.]]> http://www.dslreports.com/forum/remark,22702526 Mon, 13 Jul 2009 20:14:01 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22702450 efflandt : Not sure which routers are capable of doing TCP/IP ethernet and PPPoE on their WAN, or if you can even access your modem when in bridge mode (can you when directly connected to modem using PPPoE on the PC?). Getting a modem/router out of bridge mode sometimes requires a hard reset.

I know it may be possible (if your modem responds to its IP in bridge mode) if you had any old PC running Linux as a router and proper routing. It allows setting an ethernet IP on the nic to the modem, while the pppoe connection through that line shows up as separate ppp0 interface.

As mentioned the PPPoE is encapulated, so nothing that listens for TCP/IP on the ethernet is going to interact with the TCP/IP within the PPPoE. ]]> http://www.dslreports.com/forum/remark,22702450 Mon, 13 Jul 2009 19:58:09 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22702256 tschmidt :
said by etr102 :

Unfortunately my router still seems to be encapsulating everything in a PPPoE frame so that my modem just sends it off and it never gets routed anywhere.
As NormanS See Profile posted if you have a PPPoE connection you are out of luck since router encapsulates everything on the WAN port with PPPoE. Try the other workarounds he mentioned.

This is why I prefer modem/router combo to separate modem and router.

/tom ]]> http://www.dslreports.com/forum/remark,22702256 Mon, 13 Jul 2009 19:15:28 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22702203 NormanS : If your router is encapsulating everything PPPoE before sending it off to the gateway, you will never be able to get to the modem. Short of having the ability, in the router, to build a route to the modem, which is different from the route to the Internet gateway, about the only things that you can do would be either shift PPPoE to the modem (which is how I have my connection set up), or install another network adapter in the computer, and connect it to the modem via a switch. For that, you will have to build a route on the computer.
--
Norman
~Oh Lord, why have you come
~To Konnyu, with the Lion and the Drum]]> http://www.dslreports.com/forum/remark,22702203 Mon, 13 Jul 2009 19:04:48 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22655377 anon : Thank you for your reply, tschmidt.

Yes it is possible to set my modem's web interface IP statically. I have changed my modem's IP to 192.168.2.1, and also tried setting up a static route on my router to route all traffic for 192.168.2.0/24 to 192.168.2.1 as the next hop, which should be my modem. Unfortunately my router still seems to be encapsulating everything in a PPPoE frame so that my modem just sends it off and it never gets routed anywhere.

My router is a Netopia 3387WG-ENT, an enterprise grade router, and there are lots of routing functions to play with. There's got to be a way in there to do this, I just wish I could find it.]]> http://www.dslreports.com/forum/remark,22655377 Sat, 04 Jul 2009 22:01:41 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22655071 tschmidt : As you are finding out it is difficult to access web interface on external modem.

Is it is possible to set modem web interface IP address statically?

If so set it to a private IP address block not used on your LAN or by your ISP. ISPs often use the 10.x.x.x (10/8 address block for edge routers). Most home routers are set up as /24 meaning the last octet of the address is used for host addresses, the first three for network address. Try setting modem web interface to 192.168.2.1. That should allow you to enter 192.168.2.1 inter your browser to access the modem.

/tom ]]> http://www.dslreports.com/forum/remark,22655071 Sat, 04 Jul 2009 20:11:24 EDT Re: Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22654549 diggs : I'm not sure what the modem configured as a bidge is, I haven't come into contact with any of those (I don't think), and I'm not sure where your DHCP is coming from, but it seems like it would work if you configured the modem for router mode, and left just one dhcp server on, either on the modem or the actual router, and turned the others off. I am not sure why it is not working now though.]]> http://www.dslreports.com/forum/remark,22654549 Sat, 04 Jul 2009 17:09:11 EDT Accessing DSL Modem's web config from behind NAT router http://www.dslreports.com/forum/remark,22654335 anon : Greetings Everyone.

I am unable to access my DSL Modem's web config from behind a NAT-enabled router, was wondering if anybody had any suggestions as to how I could do this.

Here is my setup.

Zhone 6211-I3-200 Modem (configured as a bridge), with it's web config IP changed to 192.168.1.2, connected to the WAN port of a Netopia 3387WG-ENT router, configured for PPPoE, My router has an IP of 192.168.1.1 ...Connected to this router is also an Netgear 8 port managed switch (with an IP of 192.168.1.3).

This setup works perfect, and I can telnet into my switch, and router just fine, but not surprisingly, since the DSL Modem is outside of my LAN and NAT, and on the WAN side, I can't talk to it.

Do any of you know of any way of getting this to work? I would like to access my modem's web config to see such diagnostic information as error counts, etc, but I don't want to have to disconnect my router to log onto the modem.

There is one way that I know of to make it work, and that is to use my Netopia router's built in 4 port switch. If I plug the modem into one of the LAN Ports, and use another ethernet cable and connect one of the LAN ports to the WAN port my router accesses the modem via it's own built in switch, as long as I give my modem an IP on the same subnet as my other hosts. I would like to avoid wiring things up this way though.

Does anyone have any other suggestions as to how I might accomplish this task?]]> http://www.dslreports.com/forum/remark,22654335 Sat, 04 Jul 2009 16:07:10 EDT