2 wire DSL

[Luke Militello]

Karl F. Larsen wrote:
> Leonard Chatagnier wrote:
>> --- On Sat, 12/6/08, Dotan Cohen <dotancohen at gmail.com> wrote:
>>
>>   
>>> From: Dotan Cohen <dotancohen at gmail.com>
>>> Subject: Re: 2 wire DSL
>>> To: "Ubuntu user technical support, not for general discussions" <ubuntu-users at lists.ubuntu.com>
>>> Date: Saturday, December 6, 2008, 3:23 PM
>>> 2008/12/6 Karl F. Larsen <klarsen1 at gmail.com>:
>>>     
>>>>    I think you should be using 192.168.0.1 and at
>>>>       
>>> least try that. It
>>>     
>>>> has been the Standard for a lot of years. Your
>>>> 192.168.1.254 looks weird to me :-)
>>>>
>>>>    There are a lot of better numbers.
>>>>
>>>>       
>>> Of the past four routers I've had (Level 1, Edison, and
>>> some others I
>>> don't remember what they were) none of them used that
>>> address. Google
>>> your router for it's LAN-side IP address. You might
>>> even need to
>>> access it on a non-standard port (not 80).
>>>
>>>     
>> Not sure if you meant this for me or Karl but I googled over it
>> and found many hits.  But nothing to help.  No matter what router
>> IP I add to the address bar in firefox , I get a url not found error.
>> The hits may be worth looking at in the future more closely but
>> not now.  My problem, or one of them at least, is that I still can't
>> connect to my 2wire.net router configuration page via the router IP
>> or via the bookmarks in firefox that I've used before many times.
>> Once the real problem is found, I'm sure they will all work again.
>> The real problem may simply to reset the router manually but still
>> waiting for Nils and NoOp to reply to my original thread.  Since they
>> were the first to reply, I don't want to change too much and upset
>> their line of thought.  Wish they would reply soon. Thanks for your
>> input.
>> Leonard Chatagnier
>> lenc5570 at sbcglobal.net
>>
>>
>>   
>     Leonard did you get the pdf that Nils had in his message. It tells 
> you how to set everything and a lot about your 2Wire devise. I got the 
> PDF and think I will ask my phone company if I can get and use one. It 
> seems a lot faster than my old one.
> 
> Karl
> 
> 

Sounds to me the problem is a double NAT.  From what I am reading... is 
this how your network is setup?

INET <----> 2WIRE-DSL <----> WIFI-RTR <----> END-USERS

Most DSL routers do NAT by default, however lack the option of WiFi 
capabilities so most users opt for a secondary router.  If your network 
is like the one above, then your WiFi router is "NAT'ing" down to one IP 
address on the "DSL network".  Although double NAT is bad for port 
forwarding and I wouldn't recommend it, it can be done, however you must 
be sure the two private ranges are not conflicting.  In other words, if 
the device doing NAT sees the same network on each side, it will get 
confused.  If this is the case, do something like this.

INET <----> 2WIRE-DSL <--(192.168.1.0/24)--> WIFI-RTR 
<--(192.168.2.0/24)--> END-USERS

You will still have double NAT in place, but this should allow 
connectivity to 192.168.1.254 (your DSL box).  Because this IP address 
only exists on one side, your WiFi router would treat it like a "public" 
IP and translate it just fine.  Feel free to use any of these networks 
as they are all reserved for private use.

10.0.0.0/8 (10.0.0.0-10.255.255.255)
172.16.0.0/12 (172.16.0.0-172.31.255.255)
192.168.0.0/16 (192.168.0.0-192.168.255.255)

However, the best approach would be to directly connect one PC to your 
DSL box (via DHCP), login and disable NAT, connect your WiFi router back 
up, reboot both DSL and WiFi router (in that order), then login to your 
WiFi router and verify for its public address that it does NOT have an 
IP address which falls in the ranges given above.

One more thing to mention, most DSL routers will automagically disable 
NAT once they see a connection to the WAN/DSL/Internet side.  In this 
case, your network should be fine.  Simply disconnect the DSL box from 
the phone line, reboot it and you should get connectivity to 
192.168.1.254 for management purposes.  Once plugged back in to the 
phone line, connectivity to 192.168.1.254 will go away.  However, to do 
this, I would plug a PC directly into the DSL box to avoid network 
confusion if you WiFi router uses the same network as your DSL box (as 
stated above).

Hope this helps, if not, please enlighten me on your network setup as 
there are too many posts for me to trace back on ;)

-- 

Luke J Militello, CCNA
Network Engineer
Technical Operations
Charter Communications
Cisco Certified Network Associate
Michigan Technological University, BS
Computer Network & System Administration