Adelphia/Comcast uses private IP's for their routers? Try this if this is your IS

NormanNormal

2[H]4U
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Jul 22, 2001
Messages
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I had issues setting my router to 192.168.0.1, so I pinged it and was shocked to find a reply. When I did a tracert it was way out on past some router for my ISP. I saw the telnet port was open and this is what I got:

*********************************************
* *
* ADELPHIA *
* *
* UNAUTHORIZED ACCESS PROHIBITED *
* *
*********************************************




******************************* WARNING NOTICE *******************************
* *
* This system is restricted solely to Adelphia Communications Corporation *
* authorized users for legitimate business purposes only. Any actual or *
* attempted unauthorized access, use or modification of this system is *
* strictly prohibited. Unauthorized users are subject to company *
* disciplinary action and/or criminal and civil penalties under state, *
* federal or other applicable domestic and foreign laws. The use of this *
* system may be monitored and recorded for administrative and security *
* reasons. Anyone accessing this system expressly consents to such *
* monitoring and is advised that if such monitoring reveals possible *
* evidence of criminal activity, Adelphia Communications Corporation may *
* provide the evidence of such activity to law enforcement officials. All *
* users must comply with Adelphia Communications Corporation corporate *
* security instructions regarding the protection of Adelphia Communications *
* information. *
* *
******************************************************************************

User Access Verification

Username:


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Interesting huh? 192.168.15.1 also is alive with a telnet prompt for some SunOS machine.

Someone else try this is comcast/adelphia is your ISP and report back. I just can't believe they would set one of their routers to a private IP like this!
 
I just can't believe they would set one of their routers to a private IP like this!


Why not? It's what the private range of IPs is for. Large sections of Comcast use 192.168.100.1... makes it easy to pull of the web page on the modem to see where connection issues are happening.

For a short period of time you used to be able to get ping responses from the 10.x range on Comcast, which as far as I could tell at the time was the external connection on the modem back to the CMTS.
 
Yeah, that's really not all that strange...

Do you think this is what is causing problems with your router or was this simply an observation? Because if so, it's not...
 
Yup Ive seen those 192 addys befor, I thought it was something on my network for a while and was trying to get a ssh connection to it. I believe a couple of those things you can pull up in a web browser also.

And I think that 192.168.100.1 address is just a standard on cable modems, because just pulling the modem out of the box, plugging it into a wall and not even hooking the coax to it you can pull that status page from the modem.
 
192.168.100.1 is a diagnostics page served by the modem. I believe it's part of the established DOCSIS spec.
 
192.168.100.1 is a diagnostics page served by the modem. I believe it's part of the established DOCSIS spec.

And it makes for fun reading too :)

The encoding of the KDC Server Address sub-option is described in [RFC 3634].96Whenever the first PS WAN-Data interface does not have a current DHCP lease, that first PS WAN-Data interface MUST default to the following IP parameters:
"Fallback" WAN-Data IP address: 192.168.100.5
Netmask: 255.255.255.0
Default Gateway: 192.168.100.1
The purpose for the "Fallback" WAN-Data IP address is to enable access to the cable modem's diagnostic IP address (192.168.100.1) from a LAN IP Device whenever there is no regular WAN-Data IP address available at the PS. The "Fallback" WAN-Data IP address MUST only be used as the WAN IP address portion of the Dynamic NAT or NAPT tuple of a C-NAT and C-NAPT address mapping, respectively, to the cable modem's diagnostic IP address (192.168.100.1). The PS MUST default to the "Fallback" WANData IP address immediately after power up and whenever current WAN-Data IP address leases expire such that no WAN-Data IP address is left active, in order to provide continuous access to the CM diagnostic capabilities.97


http://www.cablelabs.com/specifications/archives/CH-SP-CH1.1-I10-051214-superseded.pdf
(yes it's 1.1, no I haven't had a chance to read thru 2.0 or 3.0 for that matter...)
 
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