MTR began being installed by default in place of traceroute.  If you don't know mtr, get it in your life.  It's usually how I know when cox has saturation issues at their peering with buffers killing my internet, and replaces traceroute in any number of ways.

> mtr google.com

> mtr --report -c 5 google.com
Start: Tue Jan  3 13:11:33 2017
HOST: host                       Loss%   Snt   Last   Avg  Best  Wrst StDev
 1.|-- fw1.peoria1.unifiedconver  0.0%     5    0.3   0.3   0.2   0.3   0.0
 2.|-- ???                       100.0     5    0.0   0.0   0.0   0.0   0.0
 3.|-- 100.127.69.154             0.0%     5    9.3   9.1   8.2  10.6   0.7
 4.|-- 72.215.229.22              0.0%     5    9.1  11.0   9.1  13.4   2.0
 5.|-- langbprj02-ae1.0.rd.la.co  0.0%     5   21.7  21.7  21.2  22.5   0.0
 6.|-- 72.14.215.221              0.0%     5   21.1  21.4  21.1  22.1   0.0
 7.|-- 216.239.51.33              0.0%     5   22.9  22.0  21.4  22.9   0.5
 8.|-- 209.85.246.187             0.0%     5   22.2  21.7  20.6  22.4   0.5
 9.|-- 64.233.174.207             0.0%     5   37.3  37.5  36.3  40.8   1.7
10.|-- 209.85.246.39              0.0%     5   36.4  36.8  35.7  37.8   0.7
11.|-- 108.170.243.1              0.0%     5   39.7  36.9  35.5  39.7   1.5
12.|-- 108.170.237.105            0.0%     5   35.9  36.1  35.0  37.6   0.9
13.|-- sfo03s01-in-f206.1e100.ne  0.0%     5   36.7  36.7  35.4  38.2   1.0

-mb

On Tue, Jan 3, 2017 at 12:41 PM, Carruth, Rusty <Rusty.Carruth@smartm.com> wrote:

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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