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Accessing DSL Modem Interface Behind a Router

Posted on 2004-09-13
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Last Modified: 2013-12-14
I have a Westell DSL Modem connected to a Linksys Router(BEFSR41).

The router's IP is 192.168.1.1.
The DSL Modem IP is 192.168.1.254.

Is there any way to acess the DSL Modem interface from a  PC attached to the Router?

Today I have to disconect the DSL Modem from the Router and connect it directly to a PC to access it's interface.

I do not ave ay issues with any conectivity internally or to the Internet, this is for my edification.

Many Thanks.
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Question by:scptech
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10 Comments
 
LVL 11

Expert Comment

by:Eric
ID: 12049009
change your routers IP subnet.
make it 192.168.2.1  

when you apply u get dropped..... retype in new ip  IE: http://192.168.2.1


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Author Comment

by:scptech
ID: 12060223
Could you please explain how this would work? I have not tried it yet.
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LVL 11

Expert Comment

by:Eric
ID: 12060252
The routeing table will be confused if you are routing with NAT between two physical networks that have the same subnet.  The routing table will assume all requests on the same network do not need to be routed.  If you make it 2.x  and 1.x.. it will see the web request to 1.x and say, hey thats not this network, lets pass it to my default gateway.  Which is the outer interface of your router.  That interface will see its on the same network and the connection should be made.

remember routes generally are very specific, everything else goes to the gateway.
being a specific route exsists for that ip range it will not go to the gateway.

Does that help?
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Author Comment

by:scptech
ID: 12061060
Yes, thanks, this is very helpful.
I will try it shortly.
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Author Comment

by:scptech
ID: 12069251
I tried modifying the Router's default IP to 192.168.2.1.

At that point (as expected) I lost all connectivity, internal and external, until renewing the IP address on the PC.
(The Router also servers as the DHCP server).

However, I am unable to see the Modem interface (192.168.1.254).
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LVL 11

Expert Comment

by:Eric
ID: 12069502
ok.  so now you can poing your routers internal IF 192.168.2.1 ?
can you ping its external IF ?  it will be the WAN section of the configuration.  
Is it assigned by Modem DHCP or static? Try refreshing it throught he web interface if DHCP.  Is it 192.168.1.1?
Doe you have internet connectivity now?

once you can ping both sides of your router try and ping the modem.  If it responds you should be all set.


So we have:

Internet == Modem-192.168.1.254 === 192.168.1.1-ROUTER-192.168.2.1

is that correct?

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Author Comment

by:scptech
ID: 12086588
I cannot ping the DSL Modem (192.168.1.254) from any PC.
Putting it on a different subnet does not work either.

I have learnt from Linksys and BellSoth that on Linksys routers private IP adresses are not forwarded / routed to the WAN port (to which the DSL Modem is connected). That might explain why the Modem cannot be accessed while connected to the WAN port.

I believe that there is some way using Static routing on the Router that this can still be accomplished, however, because it is an 'advanced' feature, Linksys will not support it.

Thanks again for your help.
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LVL 11

Accepted Solution

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Eric earned 50 total points
ID: 12086691
Ive never heard such a thing.... sounds more like a restriction of the modem if anything.  The router sound not act differently connecting to your modem vs any other web page.  strange.  Maybe there is a more technical reason that they did not want to get into.

I have actually done this with a linksys router.. but It went to a firewall on a T1 is the only difference.

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Author Comment

by:scptech
ID: 12170400
esczone: While I have not been able to accomplish my objective, I am awarding points to you for your courtesy in  trying to help me, and closing this issue.
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LVL 11

Expert Comment

by:Eric
ID: 12170469
Thank you.  Sorry you were unable to solve this issue.  

Atleast you not routing the same subnet anymore.  Thats bad.

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