IRC chat logs for #ltsp on irc.libera.chat (webchat)
Channel log from 9 January 2020 (all times are UTC)
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| 19:48 | <douglas_br> hello all
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| 20:32 | <dgroos> Hi. Anyone ever had the problem on Fat Clients in a 2 NIC setup where Google Chrome is unable to go to any web site even google.com?
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| 20:33 | <vagrantc> can other programs have internet access?
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| 20:33 | <dgroos> Firefox has no problems getting to any page.
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| 20:33 | <vagrantc> huh.
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| 20:33 | <dgroos> :-)
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| 20:33 | <vagrantc> probably google trying to phone home and failing for some odd reason
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| 20:33 | wild speculation :)
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| 20:34 | <mwalters> what error does chrome give?
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| 20:34 | <dgroos> And it's strange, it can be working fine for a student and after 10 minutes the problem arises. I'll post a screen shot...
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| 20:34 | I bet! hadn't though of that...
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| 20:34 | Just a bit, I'll post the screen shot...
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| 20:35 | <vagrantc> is your NAT firewalling very permissive, or does it restrict any ports, etc. ?
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| 20:36 | <dgroos> good point too, I'll check on that...
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| 20:36 | but... what's the recommended site for sharing images here?
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| 20:37 | (BTW, howdy @vagrantc !)
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| 20:37 | <vagrantc> pick your favorite
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| 20:37 | * vagrantc waves | |
| 20:37 | * alkisg waves There's also the new kid on the block, called "DNS over HTTPS", check if either of those browsers has it enabled | |
| 20:37 | <mwalters> not sure there is one... imgur is probably fine if you're fine with it being on imgur ;)
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| 20:38 | <vagrantc> dns over https ... wow.
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| 20:38 | <dgroos> ok! I'll check imgur out, not familiar w/it
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| 20:38 | <mwalters> ah yes, I thought google was going to force it to their own servers in chrome
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| 20:38 | <dgroos> (and hi @alkisg and @mwalters too!)
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| 20:38 | <mwalters> although, I think firefox is investigating doing the same, but with a more "open process" regarding which dns servers
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| 20:39 | ...somehow ended up with cloudflare's I think?
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| 20:39 | <alkisg> I've tested firefox's, it works fine with cloudflare
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| 20:39 | <mwalters> I suspect a janky 2nic config
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| 20:40 | s/janky/incorrect
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| 20:40 | but that probably doesn't make sense if it's happening on the client... dunno
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| 20:40 | <dgroos> https://imgur.com/ajMe8uZ
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| 20:41 | <alkisg> And if you open a terminal right there, does ping google.com work?
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| 20:44 | <dgroos> @alkisg, I can check the last ping check idea, I'll have to check how to check if the browsers have "DNS over HTTPS" enabled. I will have to search for a client that has this chrome problem at the moment (thanks to some students who didn't log out :-)
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| 20:47 | --- google.com ping statistics ---
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| 20:47 | 5 packets transmitted, 5 received, 0% packet loss, time 4005ms
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| 20:47 | rtt min/avg/max/mdev = 11.556/19.795/31.538/7.255 ms
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| 20:48 | <alkisg> No IP there?
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| 20:48 | Is it safesearch?
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| 20:48 | <dgroos> there? I did the ping in terminal
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| 20:49 | <alkisg> Oh I meant that you would paste the google.com ip here so that we see if your organization has google safesearch enabled or not
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| 20:49 | Anyways, need to leave, sorry!
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| 20:49 | * alkisg waves again :) | |
| 20:50 | <dgroos> :-) Thanks and Bye!
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| 20:51 | but, not a filter issue, the same site is reachable w/firefox.
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| 20:53 | But, this sparked idea and I see the problem is ONLY with google.com!
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| 20:54 | I type in a google search for "dog" and I get the dns error.
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| 20:55 | I type dog.com and it goes immediately to the site!
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| 20:56 | <vagrantc> wow, chrome only blocking google. AWESOME!
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| 20:56 | <dgroos> :-D
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| 20:56 | <vagrantc> "we detected a large amount of unsolicited advertizing very disturbingly tuned to your particular profile... and decided to block it"
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| 20:58 | <dgroos> I wonder, is it possible that it appears to google.com that all the traffic coming from my classroom is from a single computer?
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| 20:58 | Here's the error message:
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| 20:58 | www.google.comâs server IP address could not be found.
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| 20:58 | DNS_PROBE_FINISHED_NXDOMAIN
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| 20:58 | <vagrantc> if you're using NAT, definitely.
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| 20:59 | that's what NAT does
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| 20:59 | <dgroos> ummmm www.google.com's server IP address could not be found.
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| 20:59 | DNS_PROBE_FINISHED_NXDOMAIN
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| 20:59 | I am (2 NIC setup)
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| 20:59 | I've had this problem, occasionally, over the last 6+ years.
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| 21:00 | But it never happens on the teacher computer, only clients
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| 21:01 | <vagrantc> could you plug a laptop into the client network and see if it happens to them too?
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| 21:01 | e.g. using the same NAT, but not the same configuration
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| 21:02 | <dgroos> sure, I'll try right now. It doesn't always happen but let's see...
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| 21:02 | <vagrantc> could also be some sort of DNS proxy caching error?
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| 21:03 | are you using dnsmasq? does it have multiple upstream DNS servers configured, and are they both working?
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| 21:03 | something like that, maybe
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| 21:05 | <dgroos> I am using dnsmasq. Would I check this in network manager on the teacher computer?
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| 21:09 | <vagrantc> not sure off the top of my head to check how dnsmasq is configured
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| 21:09 | e.g. it might be running and only serving up dns to the clients and not the teacher compuer
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| 21:10 | <dgroos> I just went to network manager. The internet-facing NIC has 2 dns servers, an internal to our district IP and 8.8.8.8
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| 21:10 | I'm going to check on a client...
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| 21:13 | <vagrantc> i think dnsmasq will query both dns servers and use whichever it gets the first response from, and then possibly cache that for a while ... which could explain why it sometimes works for some machines
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| 21:13 | <dgroos> interesting...
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| 21:14 | <dgroos> So, I wonder which is more likely to be causing this particular problem? I'll try using just 1 at a time...
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| 21:15 | If I restart networking (sudo service networking restart?) on the server after changing the dns entries in nm on the teacher client, I wonder if it will mess things up with connecting to the clients?
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| 21:16 | is there a better way to test?
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| 21:18 | Also, service restart networking OR systemctl restart networking?
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| 21:42 | <dgroos> or... sudo systemctl restart networking.service (I'll try when students in after school study have left :-)
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| 21:43 | <douglas_br> hello all
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| 21:44 | <vagrantc> dgroos: either work, "service" basically just calls the appropriate systemctl command when running systemd
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| 21:45 | and it's certainly easier to type...
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| 21:47 | <douglas_br> I would like to know about sombebody use Linux Mint? I am trying do other ltsp server with Mint. But when client up, it show uncompressor error or stop at check after ipxe part and stop in this part
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| 21:48 | <dgroos> Ah, thanks @vagrantc
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| 21:48 | <douglas_br> so what do you thing about Mint (last version 19.3 64 bits)
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| 21:48 | think
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| 22:00 | <douglas_br> sorry
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