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:[email protected]] 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<http://google.com> ## If no dns life outside router, check the router has connectivity to the internet #### ## pull up a browser to google.com<http://google.com> to test layer 4-7 stuff On Tue, Jan 3, 2017 at 9:10 AM, Carruth, Rusty <[email protected]<mailto:[email protected]>> 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:[email protected]<mailto:[email protected]>] 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 <[email protected]<mailto:[email protected]>> wrote: The TV server, also linux, is still online. It is part of the same network. On Jan 2, 2017 11:22 AM, "Michael" <[email protected]<mailto:[email protected]>> 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~(-: --------------------------------------------------- PLUG-discuss mailing list - [email protected]<mailto:[email protected]> To subscribe, unsubscribe, or to change your mail settings: http://lists.phxlinux.org/mailman/listinfo/plug-discuss
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