Linus Sebastian, CEO, Linus Tech Tips

We Might Need a Wi-FI Upgrade - Juniper Networks Showcase

Industry Voices AI & ML
Linus Sebastian Headshot
Photo of a perplexed Linus Sebastian, CEO, Linus Tech Tips looking hard left at a Wi-Fi device with a frown and his left hand on this chin.

The future of Wi-Fi is here. It’s name is Marvis.

Nothing is more frustrating than tackling WI-FI issues. The Marvis Conversational Assistant, driven by Mist AI, can save you hours of time troubleshooting problems. Linus Sebastian demonstrates how in this entertaining episode of Linus Tech Tips.

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You’ll learn

  • What makes Marvis so amazing (the list goes on and on)

  • How exactly Marvis can help you easily troubleshoot connectivity issues 

  • If Marvis is actually smarter than man (i.e., Linus)

Who is this for?

Network Professionals Business Leaders


Linus Sebastian Headshot
Linus Sebastian
CEO, Linus Tech Tips



00:00 - There's nothing more annoying for me and my staff

00:02 than troubleshooting Wi-Fi issues.

00:03 So, when Juniper Networks told us

00:05 they wanted to sponsor a video featuring the solution

00:08 to our problems, how could we possibly,

00:12 how do I go wrong with that?

00:13 So, they sent us over some

00:15 of their AP43 Wi-Fi 6 access points

00:18 and an EX4400 switch claiming they've done it.

00:21 They figured it out,

00:22 the future of networking.

00:25 And the hardware, that's impressive.

00:27 But the real star of the show is Marvis,

00:30 the virtual network assistant driven by Mist AI.

00:34 Marvis combines machine learning

00:36 and AI with a conversational interface

00:38 that understands natural language queries.

00:40 This should save technicians hours of time

00:43 that would otherwise be spent checking dashboards

00:45 and using other troubleshooting tools.

00:48 Certainly seems like a good idea, but what I,

00:51 and probably all of you also want to know is,

00:54 how smart is Marvis?

00:57 Smarter than me?

00:58 Probably, but we can't end the video here

01:01 so we're going to have to try it anyway.

01:04 (upbeat music)

01:13 So, we started by casually installing two

01:16 of their AP43 wireless access points

01:19 and these things are basically the bangin'-est.

01:22 I'm looking at the data sheet here.

01:24 It's like limited lifetime warranty,

01:27 got a humidity, and pressure,

01:29 and temperature sensor built into it.

01:31 It's Wi-Fi 6, but not just that,

01:33 it's 4x4, with four spatial streams.

01:37 Dynamic packet capture, automatic RF optimization,

01:40 high accuracy indoor location.

01:42 So it has Bluetooth on it

01:43 so you can actually tell exactly

01:45 where everything connected to it is.

01:47 It's crazy.

01:48 So, once we were done installing a couple of these,

01:50 we set up our wireless network

01:51 and added a floor plan,

01:53 which was surprisingly intuitive

01:55 and easy to use given

01:56 the ones that I have tried before.

01:58 And now we're just going to go ahead

02:00 and pull up the management dashboard,

02:02 which you can see scales beautifully across

02:04 my dual monitors.

02:05 Maybe we'll just make it a little bit smaller.

02:07 There we go, that's more like it.

02:09 (Linus sings)

02:10 There we go.

02:11 So, this one has nobody connected to it.

02:14 It's 'cause James isn't even here today.

02:18 And then this one right here has three.

02:20 Look at that.

02:20 Wow, you can actually see.

02:23 Woah, that is exactly where look,

02:26 that's exactly where Plouffe is standing.

02:29 Oh, so coming back to the floor plan,

02:31 we got a bit of a problem.

02:32 One of our AP's is flashing purple!

02:34 - [Plouffe] (gasps)

02:36 Click it, wait, oh.

02:39 Is Jake not done breaking it yet?

02:41 He's supposed to break it

02:42 so that we can see how to fix it.

02:44 That's the problem.

02:45 That's the problem when you're trying

02:47 to do a video about like, oh, troubleshooting,

02:49 is that usually things work from Juniper.

02:54 (laughs)

02:54 So, you have to kind of come up

02:56 with contrived ways to break it on your own.

02:59 There it is, now it's broken.

03:01 Thanks, Jake.

03:03 It's broken now.

03:05 (boxing bell rings)

03:07 Now, I'm not gonna give too many details

03:08 about how we're hand-wavy fixing this,

03:11 but I will say that this gave us a really solid clue

03:14 as to where to look.

03:16 And what we needed to do

03:17 was dig into our DNS server.

03:20 In this case that's the same box as our router.

03:22 And figure out, well, why the heck

03:25 that access point isn't actually getting

03:27 an internet connection.

03:28 And it turns out that the admin. (clears throat)

03:31 Thanks, Jake!

03:31 Fat-fingered a 3 where there should have been a 2.

03:35 So, now what will probably happen in a moment here

03:38 is it's gonna come back online.

03:40 Let's try and use Marvis for this.

03:41 I can't figure out how to reset it.

03:44 It should be working now,

03:45 so let's see if Marvis can help me with it.

03:48 Troubleshoot device, James desk AP.

03:51 Oh, that is so cool.

03:53 Look at that coverage heat map.

03:56 I like it.

03:57 Now that we fixed the problem,

03:59 I mean, we still can't connect to it,

04:00 because we can't tell it to reboot itself

04:03 and get new DHCP information

04:05 because we're not connected to it.

04:07 But fortunately, look at this.

04:09 It's all like, "Oh no, no Linus,

04:11 I have a problem. I am blinking yellow 6, 7, 7 times."

04:17 Then we're gonna go consult the handy key in the software

04:19 and find out what the devil that means.

04:22 Oh, look at that, okay.

04:23 It still says no DNS response.

04:26 Man, that is so perfectly helpful

04:28 to find the problem we had.

04:30 I'm just gonna go ahead and give it

04:31 a quick unplug and replug.

04:33 It's funny how no matter how much AI we add,

04:36 that's still the way to fix so many problems.

04:39 Did you try turning it off

04:42 and turning it back on again?

04:46 Let's give it a sec here.

04:49 Wow, red and orange, a bunch of.

04:53 It's got RGB.

04:54 It has RG (beep) B,

04:57 on an access point.

04:58 Juniper, you mad lads.

05:01 That's one challenge down,

05:03 but of course what I want

05:05 to know is who's wasting network resources

05:08 watching YouTube videos on their phones

05:11 when they should be watching YouTube videos

05:13 on their desktops?

05:15 I mean, I don't actually care if they watch YouTube videos,

05:17 that's scripted into the video by the writer.

05:20 but I mean it's sort of

05:21 part of our homework sometimes

05:22 to watch YouTube videos.

05:24 But they should do it

05:25 over a wire instead of taking up air bandwidth.

05:29 So I can say the site name is LMG.

05:35 "Can you tell me something you want to troubleshoot?"

05:38 Okay, let's go with

05:42 he has a Galaxy A50,

05:45 so I'll try searching for that.

05:47 Aye, there we go.

05:49 Cool.

05:50 Let's collect some client insights.

05:51 Wow!

05:53 All right, yeah.

05:54 I've got a good solid connection speed here.

05:57 Wow.

05:59 You know, I think my bigger concern

06:01 is not actually your YouTube consumption here, Plouffe.

06:04 How on earth have you managed to do 211 megabytes of

06:08 Reddit in the last,

06:12 what is this?

06:13 Day?

06:15 Who bruh?

06:15 It's text, Plouffe.

06:17 - [Plouffe] That's my lunch break.

06:19 - That's your lunch?

06:20 Oh, I guess there's video on Reddit.

06:22 (boxing bell rings)

06:24 Now it's time to do our next challenge here

06:27 and we're supposed to click

06:28 second challenge.

06:28 So this is a desktop computer

06:30 that's actually right

06:31 on the other side of this window.

06:33 And we go in here and nothing is immediately

06:36 out of the ordinary,

06:37 but, oh connected time, two seconds.

06:40 Oh, okay, hold on.

06:41 Client insights.

06:42 Uh-oh, we've got 66 total client events

06:46 with 15 of them bad.

06:48 So this is one of those things where you're

06:49 sitting at the help desk

06:51 and someone's like, "I can't get

06:52 on the Wi-Fi."

06:53 And you go, "Well gee let me have

06:55 a look at your device here real quick, Karen."

07:01 Oh, okay you got an

07:02 authorization failure over, and over,

07:05 and over again.

07:06 I think you might've forgotten your password.

07:09 So here's your password.

07:10 Write it down, but actually don't write it

07:13 down 'cause that's even dumber.

07:16 Most of the time it's not this cut and dried though.

07:18 So, you'll have things like a problem device that's

07:21 constantly disconnecting or running into issues.

07:24 So that's where being able

07:25 to sort by good client events,

07:27 neutral and bad ones is really, really useful.

07:31 And you can grab tons of great information

07:33 from the packet captures.

07:34 And Mist actually has this great dynamic PCAP

07:37 feature that's a blessing to anyone who's sick

07:39 of trying to replicate issues.

07:40 So it'll actually actively capture data

07:42 when an error occurs

07:43 and then store it in the cloud,

07:45 meaning that you've already got the logs

07:46 and you can access them without having to go on site.

07:50 Now let's head over to roaming.

07:53 Oh, there it is, roaming.

07:54 Oh, cool.

07:55 Okay. So here's a common issue.

07:58 You can actually see the roaming data between your access

08:02 points for that particular client.

08:04 So, okay Plouffe is usually

08:06 at the Mac desk and then I don't know,

08:08 maybe he had a meeting

08:09 with James or something and connected

08:10 to his AP,

08:11 and then he's back on this one.

08:13 So you can sometimes get

08:15 into situations where you've got

08:17 someone who keeps swapping bands

08:18 to 2.4 gigahertz

08:19 or they get terrible RSSI values

08:22 from certain APS.

08:23 And that's all nicely visualized for you.

08:25 Or if you have a device that keeps swapping

08:27 back and forth

08:28 from one AP to another,

08:28 which can cause kind of a high latency feeling for them,

08:32 or it can cause issues during video calls.

08:34 Something like this can really help you get

08:36 to the bottom of something funky that's going on.

08:40 Of course what we really want

08:41 to know is can all of this save me

08:43 or more accurately Jake, time?

08:47 Well, our APS are hooked up to an EX4400 switch,

08:49 which offers flow-based telemetry, power over ethernet,

08:52 PoE++, and fast PoE, microsegmentation,

08:55 and end-to-end campus fabric

08:56 for a ton of scalability.

08:58 So what this means for our next test

09:00 is that all the extra telemetry

09:02 should be able to tell us exactly what's

09:04 going wrong without us having to go

09:06 take a look for ourselves.

09:09 (boxing bell rings)

09:11 And what's supposed to be the problem with this one?

09:14 Oh. (laughs)

09:15 I could've figured that out

09:16 if I had just actually clicked on the thing.

09:19 Yes, we have 22 bad DNS failures.

09:22 Fantastic.

09:24 Now, a common mistake when setting up

09:26 a new mobile device on a network

09:27 is just entering the DNS credentials incorrectly.

09:30 You might think you entered it correctly while you're

09:33 just following instructions.

09:35 Famous last words.

09:36 But unfortunately, you were wrong.

09:39 I dream of the day when more IT tasks

09:42 can be handed off to someone less experienced,

09:44 like me, and there's zero worry about the network going

09:47 down because of a rookie mistake.

09:49 Wrong permissions, client can't connect,

09:51 network suddenly down.

09:52 So with Marvis and Juniper networks,

09:54 the idea is that your team can leverage Mist AI

09:57 to proactively notify and correct issues

09:58 before you get a ticket,

10:00 enabling your technicians to look like heroes.

10:02 So thanks Juniper for hooking us up

10:04 and giving us an exclusive look

10:06 at all of Marvis' newest features.

10:09 If you guys are an IT professional

10:10 looking for an easier solution,

10:12 let us know in the comments.

10:13 And if you liked this video,

10:14 make sure you check out our horrible server deployment

10:17 from last year.

10:17 It'll definitely make you cringe.

10:19 Your whole face will fall off from cringe.

10:21 It will go numb,

10:23 and then fall off.

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