I recently noticed that the three VM’s I run in Azure (courtesy of my VSE subscription) had picked up a new DNS suffix. reddog.microsoft.com.

You can find out more information about the DNS Suffix below: Why is there a “reddog” DNS Suffix for my VM’s? Page 1 of 0 | cloudelicious

IP address assignment in Azure VNET’s are handled by DHCP and can be administered from the portal. This is how the new suffix is picked up by VM’s. In order to remove it, we can adjust the DHCP client configuration file.

vi /etc/dhcp/dhclient.conf
supersede domain-name "infra.williambargent.co.uk williambargent.co.uk";


sudo dhclient -v

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• Azure, Linux, Networking
• azure, ubuntu, vnet
• 08 February, 2020

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