Does FRWL apply to UDP sockets and what if it is omitted?

2 thoughts on “Does FRWL apply to UDP sockets and what if it is omitted?

  1. Hi All,

     

    Does the FRWL accept chain apply to packets arrived on a UDP socket (created with AT#SD)?

     

    If yes, what are the consequences of not issuing the FRWL at all?

     

    The documentation says default setting is ‘drop’ and therefore I would expect nothing to work if I hadn’t issued FRWL but I am seeing my units working without FRWL which leads me to think it is ignored for UDP

     

    GE865 FW 10.1.0 & 10.0.5

     

    Thanks for help and advice,

    Ciarán

    1. Hi Ciaran,

      The firewall rules (AT#FRWL) applies to all protocols on the transport layer (TCP and UDP).
      Outbound connections creates automatically a dynamic firewall rule for the period of that connection.

      Therefore, for the connections created with AT#SD, you do not have to create a static firewall rule before, with AT#FRWL.

      A static firewall rule must be created only for inbound connections (eg. for AT#SL).
      All above is valid for TCP and UDP.