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KhurshidAlamACCESS-8060 asked ·

Office365 portal IPs conflict with onprem DNS

Dear Team We are trying to setup Hybrid Office 365 . But few IP ranges in Microsoftonline.com is same i our on prem. For example Microsoftonline is having ip range 20.x.x.x and in our onprem we have also 20.x.x.x subnet/vlan. So once we login it goes to our internal dns/core switch and does not resolve login.microsoftonline.com sites. Please advice how to get rid of this without changing our vlan.

office-online-server-general
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@KhurshidAlamACCESS-8060
Please refer to trevorseward's reply.

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trevorseward answered ·

Private VLANs shouldn't be using public IP space, unless you own that IP space. You'll need to reconfigure your network, there's no way out of doing that.

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