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

**Product**: Security Gateways  
**Version**: R81.10 (EOS), R81.20, R82, R82.10  
**OS**: Gaia  
**Last Modified**: 2025-07-06

## 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).

#### NOTE

This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

## Article Properties
**Access Level**: General  
**Status**: Approved by TAC  
**Date Created**: 2024-04-11  
**Last Modified**: 2025-07-06