75 posts categorized "Paul Offord" Feed

LMTV LIVE | How to Improve Network Performance (with Keith Bromley and Jim Sullivan)

Keith Bromley from Keysight Technologies (formerly Ixia) and Jim Sullivan from ExtraHop will be talking about how to use network visibility to improve network performance. In short, network visibility is what enables you to quickly isolate and resolve performance issues; ultimately ensuring the best possible end-user experience.

Since tactical data loses 70% of its value after 30 minutes, the speed and accuracy of data analysis is critical. A proper visibility architecture addresses the strategic end-to-end monitoring goals of the network, whether they are physical, virtual, out-of-band, or inline security visibility.

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Troubleshooting Slow Broadband (by Paul Offord)

"Are you downloading something?", my wife asked when her YouTube video kept stalling. "Not me", I assured her.

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But then I noticed a port light on my broadband router going nuts, and that port was connected to my Windows computer. What the heck is going on?

In this video ...

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Sharkfest 17 EU - First Thoughts (by Paul Offord)

That's it - another Sharkfest event done and dusted.  Janice and her team did a fantastic job, as always, and the venue was truly spectacular - think of 1930's opulence with a high tech twist and fantastic food.

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I was a bit of a late comer - I didn't arrive until midday on the penultimate day - but even so, I could tell it had been a good one.  With attendees from more than 30 countries it was a truly international event.  I was lucky enough to catch several good sessions, and here's a quick summary of some important points I learned.

First up was Kary Rogers.  I think his US session should be compulsory viewing ( see https://youtu.be/tyk2-0MY9p0 ), and the EU session was another tour de force.  He presents straightforward systematic ways of looking at TCP performance, using some Wireshark features I've never thought to use, all mixed in with a dose of comedy.  The EU session had some new stuff and if it becomes available on the Sharkfest Retrospective area, you are going to want to watch it.

Then I sat in on a session called Developer Bytes Lightning Talks–Development Track, hosted by Roland Knall.  There was some real nitty gritty dev stuff in the session, but

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Analyzing Microsoft IIS Web Logs - Part 2 (by Paul Offord)

Now almost all the streams we analyze are encrypted, how can we see what's inside those pesky SSL/TLS packets. Here's one way.

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In the previous video in this series we saw how web logs provide an abundance of information; just the sort of stuff we need to take a performance problem to a developer.  And now we can analyze web logs with Wireshark.

In this video ...

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Analyzing Microsoft IIS Web Logs - Part 1 (by Paul Offord)

Wireshark's new TRANSUM plugin provides a great way to identify slow web site and web service transactions, but there's a problem.  More often than not, web traffic is carried in SSL (TLS) encrypted messages, and so, although we can see slow response times, we can't see the detail.  To prove the cause of a slow response time, ideally we want to see the URI, query strings and, in the case of a web service request, the SOAP Action value.

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If we are very lucky, we may be able to get a copy of the private SSL keys and use Wireshark to decrypt the traffic, but what if that's not possible.  The good news is that web logs have much of the information we need, and we can combine this with Wireshark network traces to get a more complete picture.

In this video ...

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