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Re: Strange LAN IP Address.

On 07/02/18 12:17, Stephen P. Molnar wrote:
I have my principle Debian Stretch platform on the LAN in our home.
Two towers (both Linux platforms) and a HP Printer have wired
connections, my Win 10 Laptop and two Android smartphones use WiFi

This morning when I

When I tried using WinSCP on the Laptop to transfer a file from the principle Linux platform the connection attempt failed!

When I ran ifconfig on the Linux platform it showed the unet
connection to be!!?????  The LAN modem employs DCHP
set with allowed IP range as through,
which was set by the T&T installer when we switched to a fiber optic

Further examination of the modem settings showed IP Passthrough
status as on (Public IP Address), which was, in fact the IP.

I spent 40 minutes, on hold for 28 of those minutes, with an AT&T UVVerse technical (????) person without hearing any reasons why the
IP was what it was.

Note the tense at the end of the above sentence, because subsequent rebooting the modem restored the IP address to the correct DHCP
range. I suppose the moral of this - first reboot the modem.

The question that I have, however, is how did this happen in the
first place? Or is the reason lost in the black hole of the

Is this indicative of a hardware problem?

Thanks in advance.

On 07/02/18 14:03, Gene Heskett wrote:
Only if the problem continues after that router has been reflashed
with dd-wrt.

Beware that finding the correct build of dd-wrt and getting it into your device correctly is non-trivial. I bricked a Netgear unit trying to upgrade dd-wrt.

On 07/02/18 17:42, David Wright wrote:
Sounds like you have a combined modem/router. My advice would be to ditch it and get separate units. This means you can, if you like,
use the modem your line provider supplies (which means they can't
blame you for any incompatibilities with the wire), but you have
full control over the router. (It also gives you more flexibility
with their siting.)

There are many FOSS firewall/ router distributions -- grab an old PC, install a second NIC and/or WiFi card, install the distribution, configure it, and you're protected. I've had good luck with:

http://www.ipcop.org/ -- Linux based, enough functionality for my SOHO network, not too complex.

https://www.pfsense.org/ -- FreeBSD based, huge functionality, can get very complex.

I alternatively ran one of the above 24x7 for years on older P3 and P4 machines, which drew too much power and generated too much heat and noise. I contemplated building a compact, energy-efficient, silent PC (mini-ITX, etc.), but the cost was not appealing. I had a WiFi access point for WiFi devices.

After the WiFi AP died, I retired the P3/P4 FOSS router and switched to a Netgear WiFi firewall/ router. I did get dd-wrt working for a while, but then bricked it when I tried to upgrade dd-wrt.

After asking opinions on various mailing lists, I settled on Ubiquiti Networks "UniFi" products:


I have a UniFi security gateway and a UniFi AC Lite Wifi access point. I disabled WiFi on my AT&T VDSL residential gateway and configured it to pass-through everything to the UniFi security gateway. As David Wright mentioned, I can still connect a laptop directly to the AT&T gateway for trouble-shooting. The AP AC Lite has plenty of coverage and bandwidth for my small home with 8+ WiFi devices.

For me, the killer feature of UniFi is that you adopt devices into networks and manage everything via a single integrated controller interface. This is far simpler than trying to manage devices individually; especially so if/when I add a hardware controller, additional AP's, cameras, etc., and/or remote sites with VPN's between them. I am not aware of any FOSS project offering this level of integration.