Suricata floods the log with "invalid checksum"



  • Just got suricata working but it floods the log with "suricata 5498 [1:2200075:2] SURICATA UDPv4 invalid checksum [Classification: Generic Protocol Command Decode] [Priority: 3] {UDP}"

    What to do about it?



  • @Koenig:

    Just got suricata working but it floods the log with "suricata 5498 [1:2200075:2] SURICATA UDPv4 invalid checksum [Classification: Generic Protocol Command Decode] [Priority: 3] {UDP}"

    What to do about it?

    Try toggling the Hardware Checksum Offloading feature under SYSTEM > NETWORKING > ADVANCED.  If that does not do it, you can simply disable that particular rule by either clicking the red X icon on the Alerts tab in the GID/SID column, or you can find and selectively disable that rule on the Rules tab for the interface.

    Bill



  • @bmeeks:

    @Koenig:

    Just got suricata working but it floods the log with "suricata 5498 [1:2200075:2] SURICATA UDPv4 invalid checksum [Classification: Generic Protocol Command Decode] [Priority: 3] {UDP}"

    What to do about it?

    Try toggling the Hardware Checksum Offloading feature under SYSTEM > NETWORKING > ADVANCED.  If that does not do it, you can simply disable that particular rule by either clicking the red X icon on the Alerts tab in the GID/SID column, or you can find and selectively disable that rule on the Rules tab for the interface.

    Bill

    I have Intel NIC's so the (QOTOM I5) hardware checksum should be working or shouldn't it?

    Waiting for an answer here I googled it, and from what I gather it is better to supress it for until I get into it more?

    I'm a total newbie when it comes to suricata.



  • @Koenig:

    @bmeeks:

    @Koenig:

    Just got suricata working but it floods the log with "suricata 5498 [1:2200075:2] SURICATA UDPv4 invalid checksum [Classification: Generic Protocol Command Decode] [Priority: 3] {UDP}"

    What to do about it?

    Try toggling the Hardware Checksum Offloading feature under SYSTEM > NETWORKING > ADVANCED.  If that does not do it, you can simply disable that particular rule by either clicking the red X icon on the Alerts tab in the GID/SID column, or you can find and selectively disable that rule on the Rules tab for the interface.

    Bill

    I have Intel NIC's so the (QOTOM I5) hardware checksum should be working or shouldn't it?

    Waiting for an answer here I googled it, and from what I gather it is better to supress it for until I get into it more?

    I'm a total newbie when it comes to suricata.

    See this thread from the official Suricata documentation Wiki for details:  http://suricata.readthedocs.io/en/latest/performance/packet-capture.html, but the short answer is you want hardware checksum offloading disabled as well as LRO (it is already off by default in pfSense).  Suricata uses PCAP for packet capture during Legacy Blocking Mode operation, and Netmap for Inline IPS Mode operation.  In both cases, hardware checksum offloading needs to be disabled.

    Bill



  • @bmeeks:

    @Koenig:

    @bmeeks:

    @Koenig:

    Just got suricata working but it floods the log with "suricata 5498 [1:2200075:2] SURICATA UDPv4 invalid checksum [Classification: Generic Protocol Command Decode] [Priority: 3] {UDP}"

    What to do about it?

    Try toggling the Hardware Checksum Offloading feature under SYSTEM > NETWORKING > ADVANCED.  If that does not do it, you can simply disable that particular rule by either clicking the red X icon on the Alerts tab in the GID/SID column, or you can find and selectively disable that rule on the Rules tab for the interface.

    Bill

    I have Intel NIC's so the (QOTOM I5) hardware checksum should be working or shouldn't it?

    Waiting for an answer here I googled it, and from what I gather it is better to supress it for until I get into it more?

    I'm a total newbie when it comes to suricata.

    See this thread from the official Suricata documentation Wiki for details:  http://suricata.readthedocs.io/en/latest/performance/packet-capture.html, but the short answer is you want hardware checksum offloading disabled as well as LRO (it is already off by default in pfSense).  Suricata uses PCAP for packet capture during Legacy Blocking Mode operation, and Netmap for Inline IPS Mode operation.  In both cases, hardware checksum offloading needs to be disabled.

    Bill

    Thank you!

    All disabled.


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