Office 365 URL categories to help you optimize the network traffic which really matters

Updated 21st May April 2019 As part of the improvements Microsoft announced in 2018 to the way the required URLs and IPs for Office 365 are published, we have also changed how the URLs are categorized to help customers deliver best practice in terms of connecting to the required endpoints for the service. In the…

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URL & IP Provisioning Service for Office 365

Updated 21 May 2019 In late 2018 Microsoft made some significant updates in the connectivity space for the Office 365 service. This consists of two elements, a new method to provide the URL & IP requirements for the service which will help our customers manage and automate the requirements, and secondly, as part of this…

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Office 365 Connectivity Guidance: Part 3

3. Unhindered access to the endpoints required. The next principle is to get your traffic to Microsoft as unhindered as possible, this means minimising the work done on the traffic or ensuring any work done doesn’t cause an impact to that traffic. When moving to the cloud it’s worth having a rethink about how you…

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Office 365 Connectivity Guidance: Part 4

4. Local DNS resolution Finally, local DNS resolution is a necessity to ensure Microsoft can connect your clients to resources based on their location. Many cloud services use this method, for example, we currently use Geo DNS for Exchange Online to connect your clients to the nearest front-end server for the service. I’ve covered this…

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Office 365 Connectivity Guidance

Updated 23 May 2019 Whilst our official guidance around Office 365 connectivity can be found at http://aka.ms/tune/ and also here it’s worth discussing in detail what best practice looks like in this space. One area I spend a great deal of time working on, and discussing with customers, is how to best connect to an…

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HTTP Flood Mitigation causing slow Exchange Mailbox Migrations to Office 365

It's been a while since I've updated this blog as I've been busy rolling out content internally in Microsoft to help our customers connect to our cloud services. I do have some new tips around checking routing and ISP performance that I'll write up soon and publish. However, my colleagues have run into an issue…

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How to analyse Application level performance for Outlook and SharePoint online

If we've stepped through all the network level checks and all looks good from that perspective, then we need to move up the stack to the application itself and see if something above the network is causing performance issues. This can prove tricky with Office 365 as the information is almost always encrypted within an…

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Checking your TCP Packets are pulling their weight (TCP Max Segment Size or MSS)

This is a quick one to check to ensure your TCP packets are able to contain the maximum amount of data possible, low values in this area will severely affect network performance. Maximum Segment size or MSS is a TCP level value which is the largest segment which can be sent on the link minus…

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Ensuring your TCP stack isn’t throwing data away

Fw In my previous blog post, I discussed checking the MSS to ensure full sized packets are used. Well, whilst you're digging around in the TCP Options of the SYN-SYN/ACK packets, it's worth checking another option SACK or Selective Acknowledgement. As you most likely know, TCP is a reliable protocol, in that it ensures delivery…

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