> Source: [sk177946](https://support.checkpoint.com/results/sk/sk177946)

# sk177946 - Anti-Spoofing drops traffic during recovery of a Security Group Member or with configured IP-Helper

| Property | Value |
|----------|-------|
| Solution ID | sk177946 |
| Date Created | 2022-02-15 |
| Last Modified | 2022-06-22 |
| Technical Level | General |
| Products | Security Gateway, Scalable Platforms |
| Versions | R81.10 (EOS), R81 (EOS), R81.10 (EOS) |
| OS | Gaia |

## Symptoms

- * Spoofing drops appear in fw ctl zdebug + drop:


  `
  @;272064749;[kern];[tid_2];[SIM-241552702];pkt_handle_no_match: packet dropped (spoofed address), conn: `, ifn 6, macs:;  
  @;272064749;[kern];[tid_2];[SIM-241552702];dst mac: xx:xx:xx:xx:xx:xx <--> src mac: xx:xx:xx:xx:xx:xx;  
  @;272064749;[kern];[tid_2];[SIM-241552702];do_packet_finish: SIMPKT_IN_DROP vsid=0, conn:;  
  @;272064795;[kern];[tid_2];[SIM-241552702];pkt_handle_no_match: packet dropped (spoofed address), conn: , ifn 6, macs:;  
  @;272064795;[kern];[tid_2];[SIM-241552702];dst mac: xx:xx:xx:xx:xx:xx <--> src mac: xx:xx:xx:xx:xx:xx;  
  @;272064795;[kern];[tid_2];[SIM-241552702];do_packet_finish: SIMPKT_IN_DROP vsid=0, conn:;  

* In R81.10, issue does not occur with Jumbo HFA Take 45 but starts after upgrading to Jumbo HFA Take 55.

* IP-Helper function may be configured on the Gateway for the dropped connections.

* Dynamic routing may be configured on the applicable Virtual System/Gateway with **Network defined by Routes** topology setting.

* **Quantum Maestro**: When the original SMO (1_1) becomes active again, the above address spoofing drops appear in zdebug.

* **Quantum Maestro**: Traffic drops do not occur on failover from blade 1_1 to 1_2 (SMO failover).

* **Quantum Maestro**: Anti-Spoofing drops traffic during recovery of a Security Group Member.

## Solution

This problem was fixed. The fix is included starting from:  

* [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 61
* [Jumbo Hotfix Accumulator for R81](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk170114) starting from Take 68
* [Jumbo Hotfix Accumulator for R80.20SP](https://supportcenter.us.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk155832) starting from Take 331

<br />

[Contact Check Point Support](https://www.checkpoint.com/support-services/contact-support/) to get a Hotfix for this issue.   
A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.   
For faster resolution and verification please collect [CPinfo](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk92739) files from the Security Management and Security Gateways involved in the case.

**Hotfix installation instructions:**   
Refer to [sk168597 - How to install a Hotfix](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168597).

---

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