IP address renumbering

The module renumbers addresses in answers to different address space. e.g. you can redirect malicious addresses to a blackhole, or use private address ranges in local zones, that will be remapped to real addresses by the resolver.

Warning

While requests are still validated using DNSSEC, the signatures are stripped from final answer. The reason is that the address synthesis breaks signatures. You can see whether an answer was valid or not based on the AD flag.

Example configuration

modules = {
        renumber = {
                -- Source subnet, destination subnet
                {'10.10.10.0/24', '192.168.1.0'},
                -- Remap /16 block to localhost address range
                {'166.66.0.0/16', '127.0.0.0'},
                -- Remap /26 subnet (64 ip addresses)
                {'166.55.77.128/26', '127.0.0.192'},
                -- Remap a /32 block to a single address
                {'2001:db8::/32', '::1!'},
        }
}