Excellent step-by-step!  +100 upvotes! ;-)

The only thing I’d add is that, if you can get an external IP address (e.g. 204.110.11.131 (inficad.com - don’t ask) or 216.58.194.206 (one possible value for google.com) and then do a traceroute -n to that address, you can see (without needing DNS) if the packets get out, and how far they get if they don’t get all the way out….

So, “traceroute -n 216.58.194.206”

Unfortunately, traceroute is not always installed by default - GO DO THAT NOW!!! ;-) Since when you need it, you won’t be able to get it!

From: PLUG-discuss [mailto:plug-discuss-bounces@lists.phxlinux.org] On Behalf Of Michael Butash
Sent: Tuesday, January 03, 2017 12:34 PM
To: Main PLUG discussion list
Subject: Re: Offline

Just work your way up the network osi model in troubleshooting.  Everyone should learn some networking these days, one way or another (speaking as a bofh network guy that deals with non-networking app and developers folk commonly - don't be part of the problem).

####

## Layer 1/2, got link? note "state"

> ip link

## If no link,  check cable plugged in for blinky lights

####

## Layer 3, got ip?

> ip addr

## If no ip, check dhcp on the network

## Optional: Set static ip for temporary troubleshooting, insert proper subnets here:

ip addr add 192.168.1.100 255.255.255.0 dev eth0

ip route add default 192.168.1.1

####

## Layer 3, verify arp to gateway

ip nei | grep `ip route | grep default | awk '{ print $3 }'`

## If no arp for gateway, check router/switch network

####

## Layer 3, ping the gateway (whatever that is for you)

ping `ip route | grep default | awk '{ print $3 }'`

## If no response, check prior steps again

####

## Layer 3/4, verify resolv.conf dns resolution and life beyond default route

ping google.com

## If no dns life outside router, check the router has connectivity to the internet

####

## pull up a browser to google.com to test layer 4-7 stuff

On Tue, Jan 3, 2017 at 9:10 AM, Carruth, Rusty <Rusty.Carruth@smartm.com> wrote:

I’ll guess that DHCP server on your router was dead.

But to know for sure - are all your systems using DHCP, or are some using static?

IF your windows side is set for static, and the Linux side is DHCP, then this would be expected - windows works, linux doesn’t.

But I’m just guessing (however, I had a router once that would lose its DHCP server on a semi-regular basis.  I considered putting it on some sort of auto-reboot device (power cycle it once a day) - finally just replaced the stupid thing ;-)

Rusty

From: PLUG-discuss [mailto:plug-discuss-bounces@lists.phxlinux.org] On Behalf Of Michael
Sent: Monday, January 02, 2017 1:42 PM
To: PLUG
Subject: Re: Offline

I'm back. I just had to reset the router..... but why would that work if windows still worked?

On Mon, Jan 2, 2017 at 11:31 AM, Michael <bmike1@gmail.com> wrote:

The TV server, also linux, is still online. It is part of the same network.

On Jan 2, 2017 11:22 AM, "Michael" <bmike1@gmail.com> wrote:

I am now offline in my Linux box. Windows is up and happy and the modem is up and happy too. Heck, the network connection shows I'm connected too. I don't know what to do. What led up to this is I was trying something with th faulty SD card. .. grated said to run, chkdsk /f , twice so I boot into Windows to do that ,couldn't do it though. Then when I boot back to Linux to reformat it there was no connectivity.

--

:-)~MIKE~(-:

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