See the iptables -j TEE policy for cloning the packet on the local
network to send it to another unbound DNS server as well as the
original unbound DNS server:
TEE
The TEE target will clone a packet and redirect this clone to another
machine on the local network segment. In other words, the nexthop
must be the target, or you will have to configure the nexthop to
forward it further if so desired.
--gateway ipaddr
Send the cloned packet to the host reachable at the given IP
address. Use of 0.0.0.0 (for IPv4 packets) or :: (IPv6) is invalid.
To forward all incoming traffic on eth0 to an Network Layer logging box:
-t mangle -A PREROUTING -i eth0 -j TEE --gateway 2001:db8::1
Paul
