How to change dnsmasq port?

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http://askubuntu.com – I am using port 53 for my vpn, and I need to use port 53. I changed the port of dnsmasq, connected openVPN, and now request are unable to resolve errors. sudo dnsmasq -p 5642 . Is there a way to change the port of dnsmasq w/o conflicts/errors? (HowTos)