anchor.diff:          };
         });
         default = [];
  -      example = [ { sourcePort = 8080; destination = "10.0.0.1:80"; proto = "tcp"; } ];
  +      example = [
  +        { sourcePort = 8080; destination = "10.0.0.1:80"; proto = "tcp"; }
  +        { sourcePort = 8080; destination = "[fc00::2]:80"; proto = "tcp"; }
  +      ];
         description =
           ''
             List of forwarded ports from the external interface to
  -          internal destinations by using DNAT.
  +          internal destinations by using DNAT. Destination can be
  +          IPv6 if IPv6 NAT is enabled.
           '';
       };
   
  
positive.code:         kernel.sysctl = {
            "net.ipv4.conf.all.forwarding" = mkOverride 99 true;
            "net.ipv4.conf.default.forwarding" = mkOverride 99 true;
          };
        };
  
  
negative.code:           destination = mkOption {
              type = types.str;
              example = "10.0.0.1:80";
              description = "Forward connection to destination ip:port (or [ipv6]:port); to specify a port range, use ip:start-end";
            };
  
            proto = mkOption {
  