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UDP Flood Threshhold issues

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  • 1.  UDP Flood Threshhold issues

    Posted 09-18-2017 09:19

    I'm trying to configure my SRX and finding issues with UDP flood warnings from Gooogle and my voip providor.  I have already raised the threshhold to 5000 and am still seeing issues.   Doing some research is appears Google is using a protocol called QUIC ( which uses UDP 443 to deliver youtube.  Is there a way I can whitelist traffic from the screen?  I want to be able to whitelist QUIC traffic and traffic from my VoIP providor.

  • 2.  RE: UDP Flood Threshhold issues

    Posted 09-18-2017 11:01

    set zone untrust screen udp-flood ?

    See if you get an option such as source-address and you may be able complete a config like this: <voip-providers-ip> threshold <15000> A value you can tweek.

  • 3.  RE: UDP Flood Threshhold issues

    Posted 09-18-2017 13:50
    This is on an SRX300 running junos 15.1X49-90.7

    I did not exactly have that command, it looks like some examples I saw for ScreenOs. Here is what I got

    set security zones security-zone Internet screen untrust-screen ?
    Possible completions:
    <[Enter]> Execute this command
    > address-book Address book entries
    > advance-policy-based-routing-profile Enable Advance Policy Based Routing on this zone
    application-tracking Enable Application tracking support for this zone
    + apply-groups Groups from which to inherit configuration data
    + apply-groups-except Don't inherit configuration data from these groups
    description Text description of zone
    > host-inbound-traffic Allowed system services & protocols
    > interfaces Interfaces that are part of this zone
    source-identity-log Show user and group info in session log for this zone
    tcp-rst Send RST for NON-SYN packet not matching TCP session
    | Pipe through a command

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  • 4.  RE: UDP Flood Threshhold issues

    Posted 09-18-2017 23:28



    I doubt that such whitelist is possible in the UDP flood though it's available for TCP SYN flood only.


    You can refer below links for the details:





  • 5.  RE: UDP Flood Threshhold issues
    Best Answer

    Posted 09-19-2017 02:38

    We cant do that. We need to increase the threshold.