> Source: [sk169352](https://support.checkpoint.com/results/sk/sk169352)

# sk169352 - Dynamic Dispatcher in VSX does not forward the connections equally to all CoreXL instances

| Property | Value |
|----------|-------|
| Solution ID | sk169352 |
| Date Created | 2020-09-14 |
| Last Modified | 2021-11-15 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R81 (EOS) |
| OS | Gaia |

## Symptoms

- * Dynamic Dispatcher in VSX does not forward the connections equally to all CoreXL instances.

* Installing the hotfix in [sk168513](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk168513) does not solve the issue.

## Cause

The Dynamic Dispatcher algorithm does not fully consider the different VSs on a VSX gateway.

## Solution

This problem was fixed. The fix is included in:

* [Check Point R81](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk166715)
* [Jumbo Hotfix Accumulator for R80.40](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk165456) starting from Take 91
* [Jumbo Hotfix Accumulator for R80.30](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk153152) starting from Take 227
* [Jumbo Hotfix Accumulator for R80.20](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk137592) starting from Take 187

<br />

**After installing the fix or the aforementioned jumbo takes, the below kernel parameters should be enabled to enforce the new behavior:** # fw ctl set -f int fwmultik_enable_round_robin 1  
# fw ctl set -f int fwmultik_enable_increment_first 1  

* The change in behavior should be observed on the fly and without a need in reboot (it may take some time as old connections are already affined to specific instances)
* In order to allow these parameters to survive a reboot, the parameters should be added into the fwkern.conf file
* **Starting in the below versions, these Kernel parameters are enabled by default:**
  * R80.30 Kernel 2.6 JHF take 219 - PRJ-16349
  * R80.30 Kernel 3.1 (GOGO) JHF take 219 - PRJ-16352
  * R80.40 - integrated as a GA with any JHF take

<br />

Check Point recommends to always upgrade to the most recent version   
([upgrade Security Gateway](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=overview&product=435) / [upgrade Security Management Server](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=overview&product=184) / [upgrade Multi-Domain Security Management](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doShowproductpage&productTab=overview&product=166)).

<br />

If you choose not to upgrade, Check Point can supply a **Hotfix** . [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 files](http://supportcontent.checkpoint.com/solutions?id=sk92739) from the Security Management Server and Security Gateways involved in the case.

CoreXL mechanism has been improved when firewall running in VSX mode.  

<br />

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