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Allowing Broadcast (either LAN or Global)

Argo

I have an SG135 that I would like to allow Broadcast for certain devices.

how do I accomplish this?

I have tried

Source Devices -> Any Service -> Broadcast Address (255.255.255.255/255.255.255.255 or a.b.c.255)

neither have worked as I still see broadcast traffic is being dropped.

I do realize that the UTM is meant to drop broadcast traffic, but I have read about ways to allow this traffic.

Any help appreciated.



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  • 0

    I always thought that a broadcast went to very IP in the sender's subnet and that the UTM just dropped the packet sent to it.  Isn't that what's happening?

    Cheers - Bob 

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • 0 in reply to BAlfson

    Hi Bob,

    yep, you're right.

    I can get the LAN Broadcast to be allowed but am unable to find a way to get the Global Broadcast to be allowed inside the UTM.

    well that's not entirely true, there are 5 Global Broadcasts being transmitted, only one is allowed (e.g. it is going green) the other five are dropped automatically.

    ** I may need to learn about global broadcasts, as I think I am missing something obvious to do with global broadcasting.

     

    thanks for you response

    XG & UTM Architect (Systems: XG v18 & UTM 9.7 - Virtual, HW & SW)
    Curious enough to take it apart, skilled enough to put it back together, Clever enough to hide the extra parts when I'm Done!

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  • 0 in reply to BAlfson

    Hi Bob,

    yep, you're right.

    I can get the LAN Broadcast to be allowed but am unable to find a way to get the Global Broadcast to be allowed inside the UTM.

    well that's not entirely true, there are 5 Global Broadcasts being transmitted, only one is allowed (e.g. it is going green) the other five are dropped automatically.

    ** I may need to learn about global broadcasts, as I think I am missing something obvious to do with global broadcasting.

     

    thanks for you response

    XG & UTM Architect (Systems: XG v18 & UTM 9.7 - Virtual, HW & SW)
    Curious enough to take it apart, skilled enough to put it back together, Clever enough to hide the extra parts when I'm Done!

Children
  • 0 in reply to Argo

    I'm not sure where these broadcasts are coming from or what "going green" means, but does How to fix the global broadcast address (255.255.255.255) behavior on Windows help?

    Cheers - Bob

     
    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • 0 in reply to BAlfson

    Hi Bob,

    apologies I didn't explain myself, the 'going green' is the firewall live log, and when a packet is applied an allow rule it goes green ... see image

    and the article you reference is for windows but this app is on Linux (unfortunately it is a global broadcast, i think due the the developers). I have since got around it (global broadcast) by placing a switch in between the server and the UTM.

     

    on a side note, the image above is the same source (server IP) and destination (255.255.255.255) for all three but only one has the rule applied, this is where I said I need to understand the Global Broadcast.

    XG & UTM Architect (Systems: XG v18 & UTM 9.7 - Virtual, HW & SW)
    Curious enough to take it apart, skilled enough to put it back together, Clever enough to hide the extra parts when I'm Done!

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