> Source: [sk182154](https://support.checkpoint.com/results/sk/sk182154)

# sk182154 - The PPPoE interface loses its IP address after the ISP restart

| Property | Value |
|----------|-------|
| Solution ID | sk182154 |
| Date Created | 2024-04-11 |
| Last Modified | 2025-07-06 |
| Technical Level | General |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20, R81.10 (EOS) |
| OS | Gaia |

## Symptoms

- * The PPPoE interface loses its IP address after the Internet Service Provider's restart until rebooting the Security Gateway.

* The `/var/log/messages` file contains these messages:

  * `Timeout waiting for PADO packets`
  * `Unable to complete PPPoE Discovery`
* Changing the state of the PPPoE interface to "off" and then to "on" resolves the issue.

## Cause

When a PPPoE interface is added, it obtains a unique interface identifier ("`ifn`"), which is stored in the "`ifn_map`" database.

When the Internet Service Provider refreshes the IP address of an existing PPPoE interface:

1. The system changes the existing PPPoE interface name in the "`oftab`" database.
2. However, the changes do not reach the "`ifn_map`" database, which means the "`ifn`" identifier remains the same.
3. The IP address change of the PPPoE interface does not reach the "`ifn_map`" database as well.
The difference between the two databases causes the interface issues.

## Solution

This problem was fixed. The fix is included in:

* [Jumbo Hotfix Accumulator for R82](https://sc1.checkpoint.com/documents/Jumbo_HFA/R82/Default.htm) starting from Take 14
* [Jumbo Hotfix Accumulator for R81.20](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.20/Default.htm) starting from Take 99
* [Jumbo Hotfix Accumulator for R81.10](https://sc1.checkpoint.com/documents/Jumbo_HFA/R81.10/Default.htm) starting from Take 173

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.

**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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