> Source: [sk102235](https://support.checkpoint.com/results/sk/sk102235)

# sk102235 - Simultaneous ping to IPv6 addresses of cluster members and to Cluster Virtual IPv6 address does not work

| Property | Value |
|----------|-------|
| Solution ID | sk102235 |
| Date Created | 2014-08-29 |
| Last Modified | 2015-05-23 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |
| OS | Gaia |

## Symptoms

- * Cannot simultaneously ping Cluster Virtual IPv6 address and physical IPv6 addresses of cluster members.

* Cannot ping Cluster Virtual IPv6 address.

* Setting the value of kernel parameter "fw_allow_simultaneous_ping" to "1" has no effect on IPv6 pings - neither when setting with "fw6 ctl set int fw_allow_simultaneous_ping 1" command, nor when setting in the *$FWDIR/boot/modules/fwkern.conf* file.

* Kernel debug shows that the IPv6 pings are dropped due to link collision ("fwconn_key_set_link: failed to set the link (-3);") as described in [sk26874](http://supportcontent.checkpoint.com/solutions?id=sk26874).

* Simultaneous ping to IPv4 addresses works correctly.

## Cause

The kernel parameter "fw_allow_simultaneous_ping" does not support IPv6.

## Solution

This solution requires authentication. Please log in to view the full solution.

---

# Agent Instructions

This content is from the Check Point Support Center (https://support.checkpoint.com), the official knowledge base for Check Point cybersecurity products.

## Navigating This Knowledge Base

- **Complete index**: [llms.txt](https://support.checkpoint.com/llms.txt)
- **All SK articles**: [SecureKnowledge Sitemap](https://support.checkpoint.com/sitemaps/secureknowledge-sitemap-index.xml)
- **SK article URL pattern**: `https://support.checkpoint.com/results/sk/{skId}`
- **Markdown responses**: AI bot User-Agents automatically receive `text/markdown` content