Private IP from ISP

[jamin123]

Adelphia installed cable Internet at my home yesterday, they made the line hot and I’m doing self-installation. The only IP’s my uBR924 cable modem is picking up are private IP’s, so I called them and told them I’m getting a private IP, which is not routable on the internet they said those IP’s are their setup IP and I should be getting a 60.20.x.x IP. They can’t get the problem fix and I don’t want them to come to my house because I’ve a lab and don’t want them to think I’ll be running all that stuff from their ISP network.

Sh ip int brief: shows interface up with an IP 10.175.69.105
Sh ip route: shows Default gateway as 10.175.68.1

I can ping Cisco.com and MSN.com, but when I trace the packet drop at a 68.20.x.x network.

What’s the best way to work with Adelphia on the problem?

 

[geirendre]

well, if you can ping cisco.com and msn.com it sounds like your ICMP-packets are getting routed trough the Internet (and back), dosn't it?
Have you tried rebooting your router to see if it gets a new IP-address?
Maby your ISP has an Access Control List that deny traceroute.....
and is NAT-ing your privat address...

 

[pgordemer]

There probably is nothing wrong. Many of the cable companies do a NAT translation much higher up in their routing structure.

Example, I have COMCAST Workplace at home. I have a UBR905 and that Lan IP address is 10.1.10.1 At the comcast master router the OUTSIDE address of 66.xx.xx.xx (My static IP) is NAT translated to their internal number that corresponds with my LAN IP.

Phil Gordemer
Manager, Technical Support
CADD Value Corporation

 

[shorty545]

Try to open a session of Internet Explorer and type in an IP address instead of a DNS address. Some Internet Providers require registering the individual PC with their network before you are allowed to get a public IP address. Maybe try 64.233.167.99 instead of

http://www.google.com

in Internet Explorer.

~Jeremy

 

[jamin123]

I agreed that a replied to ping mean I’ve access. However, I tried the IP instead of the URL in IE., that still didn’t work. I did notice that when I every site I ping resolved with the same IP address, why? Maybe because they are using NAT, but all packets dropped as soon as it hit their outside global address. I shut the interface down, erase the start configuration and reboot the router and each time gets a 10.175.x.x address.

Phil, are you using that “static inside source” command to map to there outside global address? I should not have to do that. I just moved to a new address and used the same configuration with Cox cable Internet, so I believe it’s a Adelphia problem they're the only cable ISP in my city.

 

[thebruge]

Shot in the dark......but maybe a mtu issue? If you can ping everywhere then there is no problem with the routing. Try bringing the mtu down to 1400 and see if it makes a difference:

http://www.winguides.com/registry/display.php/280/