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

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:

The system changes the existing PPPoE interface name in the "oftab" database.
However, the changes do not reach the "ifn_map" database, which means the "ifn" identifier remains the same.
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 starting from Take 14
Jumbo Hotfix Accumulator for R81.20 starting from Take 99
Jumbo Hotfix Accumulator for R81.10 starting from Take 173

If you choose not to upgrade, Check Point can supply a Hotfix. Contact Check Point 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 from the Security Management Server and Security Gateways involved in the case.

Hotfix installation instructions:

Refer to sk168597 - How to install a Hotfix.

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