anchor.diff:  
         sectionDHCPServer = checkUnitConfig "DHCPServer" [
           (assertOnlyFields [
  +          "ServerAddress"
             "PoolOffset"
             "PoolSize"
             "DefaultLeaseTimeSec"
             "MaxLeaseTimeSec"
  +          "UplinkInterface"
             "EmitDNS"
             "DNS"
             "EmitNTP"
  
positive.code:           "EmitLPR"
            "LPR"
            "EmitRouter"
            "EmitTimezone"
            "Timezone"
            "SendOption"
            "SendVendorOption"
          ])
          (assertInt "PoolOffset")
          (assertMinimum "PoolOffset" 0)
  
negative.code:           "OtherInformation"
            "RouterLifetimeSec"
            "RouterPreference"
            "UplinkInterface"
            "EmitDNS"
            "DNS"
            "EmitDomains"
  