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bachya/DD-WRT DNS Router.sh

Created September 5, 2014 17:28
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iptables rules to re-route specific hosts to certain DNS servers in DD-WRT
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DD-WRT DNS Router.sh
# For the Media Center, use WAN DNS (i.e., Comcast).
# #############################################################
iptables -t nat -A PREROUTING -i br0 -s media-center.phil.lan -p tcp --dport 53 -j DNAT --to $(nvram get wan_get_dns | awk -F' ' '{print $1}')
iptables -t nat -A PREROUTING -i br0 -s media-center.phil.lan -p udp --dport 53 -j DNAT --to $(nvram get wan_get_dns | awk -F' ' '{print $1}')
# For the PS3, use WAN DNS (i.e., Comcast).
# #############################################################
iptables -t nat -A PREROUTING -i br0 -s ps3.phil.lan -p tcp --dport 53 -j DNAT --to $(nvram get wan_get_dns | awk -F' ' '{print $1}')
iptables -t nat -A PREROUTING -i br0 -s ps3.phil.lan -p udp --dport 53 -j DNAT --to $(nvram get wan_get_dns | awk -F' ' '{print $1}')
# For the Samsung TV, use WAN DNS (i.e., Comcast).
# #############################################################
iptables -t nat -A PREROUTING -i br0 -s samsung-tv.phil.lan -p tcp --dport 53 -j DNAT --to $(nvram get wan_get_dns | awk -F' ' '{print $1}')
iptables -t nat -A PREROUTING -i br0 -s samsung-tv.phil.lan -p udp --dport 53 -j DNAT --to $(nvram get wan_get_dns | awk -F' ' '{print $1}')
# For every other client, use LAN DNS.
# #############################################################
iptables -t nat -A PREROUTING -i br0 -p udp --dport 53 -j DNAT --to $(nvram get lan_ipaddr)
iptables -t nat -A PREROUTING -i br0 -p tcp --dport 53 -j DNAT --to $(nvram get lan_ipaddr)
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