probe router wirelessly, double NAT

Nils Kassube kassube at gmx.net
Sun Dec 29 07:45:31 UTC 2013


thufir wrote:
> I'm having some trouble with vuze, so am looking at some networking. 
> The computer uses a wifi adapter to connect with the router.  The
> adapter is a bit unusual:
> 
> http://www.iogear.com/product/GWU627/
> 
> So the computer gets an IP address from the adapter, and the adapter
> gets an IP address from the router.  Presumably this is double-NAT?

I had a look at the manual of your GWU627 and I think the device works 
as a bridge and you have single NAT from your router.

> thufir at dur:~$ ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:13:20:ac:13:b0
>           inet addr:192.168.0.15  Bcast:192.168.0.255 

[...]

> thufir at dur:~$ traceroute 192.168.1.1

192.168.1.1 is a private IP address which is only used in your local 
network. Do you have a machine with that IP in your LAN? Or is it a typo 
and you meant 192.168.0.1 which seems to be your router?

> traceroute to 192.168.1.1 (192.168.1.1), 30 hops max, 60 byte packets
>  1  192.168.0.1 (192.168.0.1)  1.364 ms  6.244 ms  6.238 ms
>  2  * * *
>  3  64.59.147.161 (64.59.147.161)  19.651 ms  21.628 ms  21.655 ms
>  4  rc2bb-tge0-4-0-5.vc.shawcable.net (66.163.69.33)  21.772 ms rc2bb-
> tge0-13-0-10.vc.shawcable.net (66.163.69.141)  24.005 ms rc2bb-
> tge0-13-0-6.vc.shawcable.net (66.163.69.137)  23.947 ms

Your router tries to find the way to 192.168.1.1 via the public 
internet. That can't work because private addresses should not be 
reachable that way.


Nils





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