> Source: [sk174969](https://support.checkpoint.com/results/sk/sk174969)

# sk174969 - VLANs lose IPv6 addresses after trunk is restarted/added/removed from a bridging group

| Property | Value |
|----------|-------|
| Solution ID | sk174969 |
| Date Created | 2021-08-28 |
| Last Modified | 2022-04-07 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R81.10 (EOS), R81 (EOS) |

## Symptoms

- * VLANS lose IPv6 addresses after the trunk is restarted/added/removed from a bridging group
* If users do one or more of these actions, the IPv6 address disappears:
  * add bridging group \<\> interface \<\>
  * delete bridging group \<\> interface \<\>
  * set interface eth5 state off
  * set interface eth5 state on

## Solution

This problem was fixed. The fix is included in:

* [Jumbo Hotfix Accumulator for R81.10](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk175186) starting from Take 38
* [Jumbo Hotfix Accumulator for R81](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk170114) starting from Take 60
* [Jumbo Hotfix Accumulator for R80.40](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk165456) starting from Take 158
* [Jumbo Hotfix Accumulator for R80.30](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk153152) starting from Take 251
* [Jumbo Hotfix Accumulator for R80.20](https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk137592) starting from Take 208

If you choose not to upgrade, run this command to restore the IPv6 address:  

`[Expert@admin]# ifm -o`  

**Important:**This command causes an outage for a few seconds.

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