+d64 = s:taboption("service", Flag, "dns64", translate("Enable DNS64:"),
+ translate("Enable the DNS64 module"))
+d64.rmempty = false
+
+pfx = s:taboption("service", Value, "dns64_prefix", translate("DNS64 Prefix:"),
+ translate("Prefix for generated DNS64 addresses"))
+pfx.datatype = "ip6addr"
+pfx.placeholder = "64:ff9b::/96"
+pfx.optional = true
+pfx:depends({ dns64 = "1" })
+