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19-Oct-2019 17:41

And if you click, particularly with dispersed— geographically dispersed services like Google, bigger services, you can use this history bar at the bottom and select a value, and you'll actually get the network at that time. And we talk about being able to do time travel and look at what these routes were back in the past, but how many times do you guys have a trouble ticket. The worst example is, an executive comes by and says, "Hey, how's it going in IT? And in fact, the probe, that's installed by default when you install IPM or you do your upgrade, will be on your primary poller. So that's how everyone thinks about it, but that's not the way to continue thinking about it. And that's really the big difference with Traceroute, right? So this way, you're going to see exactly what your users on that application are going to generate. The challenge is, in any of these paths, particularly those that go over the internet, you will have portions of the path that take very little time, like between your own equipment and from inside one room in a building to another room inside that same building, between wiring closets.

" "Oh, it's good." "Yeah, it seems to be going pretty good upstairs, "but man, last Thursday the internet was just so slow." That's right. So one of the things we see with Google, as we move through time, that first graph had a single end point. The idea is that the probe is a representative of your user. Meanwhile, you will also have single hops that are going over an internet backbone, that may be going over hundreds or even a thousand miles, or undersea cables, whatever that might be. Yeah, so let's zoom out here, and we'll have to— if take this same scenario as an example, if we zoom out and take a look at Salesforce. Let's go ahead and expand that and see the nodes that are part of that network. So if we actually mouse over the nodes on each side, we can start pulling out the information we need.

If you click on that network, it will break it out into the hops that comprise that network, and then we're starting to see this hop-by-hop performance, right? And then interval I'm going to probe it, and it's not polling, because this is different. Because polling suggests you have some administrative access. So here we can see a couple places where there's red. Right off the bat, I'm red at my end, because something in this overall path is being affected, right? But just off the bat, right off the bat, I can see that there's another red link here that looks like it's inside my firewall, so just in this first view, do I suspect there's a problem inside? Like, one of the things that it's also giving here is the contact information for that particular node. That comes from one of the internet databases, and you can get even more information if you drill down and start inspecting the DNS, if you're careful in how you parse through it. So we've got configuration chains that happen between and p.m. We'll just click, and it'll tell us what changed in your configuration. So here we can see our NTA information coming across.

From this node to this node, your traffic going through that is imposed two milliseconds of delay. There's a lot of different things going on, and we'll get into that in just a little bit. So here, I can see these are aggregation, AG, aggregation routers. So I can actually get down to the interface name sometimes when people are using that as part of their DNS standard. Looks like the problem started around p.m., ran through , or so. Traffic shapers are egress on this interface, so we'll click our egress here. So we see the transit likelihood of 67% on this link, means some of the customers are getting to the link and it's going fine.

And we can get some more details if we hover over that, about how much packet loss there is, how much transit likelihood. One of the things that we've discovered, and is definitely new for internet paths is that most of these paths are multi-paths. We can see there's a very small amount of traffic being sent through this interface, so likely we're shaping, at a low percentage, of that interface's available bandwidth. Or when it's coming back and they potentially get routed to a different path because they got a new speed conversation, then they may get a link that's working, they may get a link that's not working.

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So this is an example of, we've got data for all of these different links, but we found this specific link is the problem, and the problem is that that link has high latency. Dynamips then, thankfully, routes that over, I don't know how, to the GNS3 VM, running on Virtual Box, which is a different hypervisor. That routes back over to my Dynamics, local Dynamips instance here. OSX using Packet Filter that's built in to the OSX operating system. And I know we're not going to reveal any kind of current roadmap or anything, but what are some of the things that you're thinking about?

Because there's a part of it that seems, "Wow, this is some kind of amazing spoofing that's going on," or we're looking inside of firewalls. Okay, so I imagine this is some sort of custom-crafted packet, where we are messing with the information in the packet, the port, and the TTL information. Oftentimes Traceroute gives you information that's a little bit unintuitive, like hop number three has high packet loss, while hop number four has no packet loss. So there's a layer of— there's two things different that we're doing in Net Path. So, we see, we've got our Windows 2012 server that's running Orion. We've got GNS3 VM running through Virtual Box as the hypervisor.

The first of which is, we are crafting our own packets, TCP packets, that look like the application traffic. We're using GNS3, which is an amazing network emulation tool. That's what they prefer, so that's how they packaged it.

You can install it on pretty much any halfway-modern Windows desktop. So they seem to, first of all, be grateful, because you can get them to resolution quickly, and it's something that doesn't just affect us. It's just a fact of the matter that customers calling in and saying, "Hey, sometimes our internet is slow and we think it's you." Not super helpful. So for Time Warner, they went and actually removed their cell number from that. One is, there are internet databases that have contact information for networks. So it's really only the combination of those two that allows you to reach the intelligent conclusion of, I have a problem in Salesforce's network at this spot specifically. " The way that Traceroute works is by incrementing TTLs and sending ICMP or UDP traffic across a path to try and get responses.

Windows client, we will push the agent uses the agent architecture we already have for SAM in Qo E; this is just a new piece of technology, what we call a plug-in. It affects any of the users who are using that service. So that brings us to the second point, which is, they often times ask, how do we get this information? This is designed for network engineers by network engineers to help us manage networks. And now I have the phone number to tell them about it. You may notice that often times Traceroute is blocked. Yes, Parallels is the hypervisor there, running the Windows VM.

So that's the new F5 load balancer support, the new interface, and the upgraded installer.