anchor.diff:  
         sectionDHCPServer = checkUnitConfig "DHCPServer" [
           (assertOnlyFields [
  +          "ServerAddress"
             "PoolOffset"
             "PoolSize"
             "DefaultLeaseTimeSec"
             "MaxLeaseTimeSec"
  +          "UplinkInterface"
             "EmitDNS"
             "DNS"
             "EmitNTP"
  
positive.code:         (assertValueOneOf "EmitLPR" boolValues)
          (assertValueOneOf "EmitRouter" boolValues)
          (assertValueOneOf "EmitTimezone" boolValues)
        ];
  
        sectionIPv6SendRA = checkUnitConfig "IPv6SendRA" [
  
negative.code:           "OtherInformation"
            "RouterLifetimeSec"
            "RouterPreference"
            "UplinkInterface"
            "EmitDNS"
            "DNS"
            "EmitDomains"
  