NetworkManager dnsmasq Setup (Centos 7)

/etc/NetworkManager/conf.d/dnsmasq.conf
(name could be anything):

[main]

dns=dnsmasq

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Setup Network Bridge Using NetworkManager (Centos 7)

After creating the bridge in NetworkManager, add the following to the ifcfg-eth-xxx for the actual adapter chosen in NetworkManager:

BRIDGE=

Then restart NetworkManager. May take a bit of time to DHCP the bridge.

Note:
With this setup, the ethernet adapter will not configure any IP address, so no changes are needed for that.