First method

The Roku has no possibility to change the DNS to a specific one, so to use US Netflix with the roku the DNS has to be set in the router.

I don’t like all my DNS traffic going to a DNS that I don’t trust so with options of dnsmasq that comes with openwrt I set DNS Forwarding.

Be careful to change x.x.x.x for the ip address of the DNS service you want to use.

example http://www.unblock-us.com ip 208.122.23.23

in the file /etc/config/dhcp add the following lines below config dnsmasq.

    list server '/netflix.com/x.x.x.x'
    list server '/nflximg.net/x.x.x.x'
    list server '/nflximg.com/x.x.x.x'
    list server '/roku.com/x.x.x.x'
    list server '/mgo-images.com/x.x.x.x'
    list server '/netflix.net/x.x.x.x'
    list server '/netflix.net/x.x.x.x'
    list server '/roku.com/x.x.x.x'
    list server '/scorecardresearch.com/x.x.x.x'

it is necessary to add all that list servers.

This method could work for any other hardware but I have only tested it in the roku.

Second method

At first I was using the first method but I had to keep adding forwarder addresses to the dhcp file.

in “network->firewall->custom rules” add the following rules

iptables -t nat -A PREROUTING -i br-lan -s x.x.x.x -p udp –dport 53 -j DNAT –to-destination y.y.y.y:53
#iptables -t nat -A POSTROUTING -j MASQUERADE

where x.x.x.x is the roku or other device you want to use with a specific dns server and y.y.y.y is the address of the specific dns server.