Firewall UDP traffic,

Posted on 2007-10-09
Last Modified: 2013-11-16
Correct me If I am wrong here, I guess when you setting up a firewall in particular TCP connection its very much depending on who initiate the connection. So for instance if
Network A wants to communicate to Network B
In this case, we can just setup TCP allow Network A to Network B. This is because TCP is a stateful packet.

How about for UDP?
If Network A wants to communicate to Network B?
Do we need to allow packet from
Network A to Network B and
Network B to Network A?
Question by:kecoak
    LVL 1

    Accepted Solution

    UDP is connectionless, just open ports in both routers to allow.

    I use it for syslog monitoring on udp514

    Author Comment

    just open ports in both routers to allow??
    as in open traffic from NETWORK A to B on say on port 2300
    and open traffic from NETWORK B to A on port 2300???
    LVL 14

    Expert Comment

    Yep, kvnsdr is spot-on. In Checkpoint for example you would define a "service" and specify UDP port 2300 for it. Then you put a rule in allowing this service to / from your networks.
    LVL 1

    Expert Comment

    Yes, that's all there is to it. Define a 'Service' and specify port range 2300 to 2300

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