PPPOE connection dropping WAN1

Yes, it is possible that the issue you're experiencing with the high-speed bridge modem could be related to the LCP (Link Control Protocol) echo interval. LCP is a protocol used in PPP (Point-to-Point Protocol) connections to establish, configure, and test the link between devices.

The LCP echo interval determines the frequency at which echo request messages are sent between the PPP devices to ensure the link is active and functioning properly. If the LCP echo interval is too high or misconfigured, it can lead to intermittent connection drops or connectivity issues.

Here's how you can troubleshoot this issue:

1. Check LCP Echo Interval: Review the LCP echo interval setting on your FortiGate device and the bridge modem. Ensure that the values are consistent and appropriate for your network environment. Typically, the default interval is around 30 seconds.

2. Adjust LCP Echo Interval: If the LCP echo interval is set to a high value, consider reducing it to improve the responsiveness of the link and decrease the chance of connection drops. However, be cautious when making changes and ensure compatibility with the bridge modem.

3. Verify Modem Compatibility: Ensure that your bridge modem is compatible with the FortiGate device and supports the required PPP and LCP settings. Check for firmware updates for the modem that might address any known issues related to LCP.

4. Check Modem Configuration: Review the configuration settings on the bridge modem, specifically related to PPP and LCP. Verify that the settings align with the requirements of your FortiGate device and the network environment.

5. Contact ISP or Modem Manufacturer: If you have exhausted troubleshooting steps on your end and the issue persists, it's advisable to contact your Internet Service Provider (ISP) or the manufacturer of the bridge modem for further assistance. They can provide specific guidance or potential firmware updates to address the connectivity problems.

Remember to document any changes you make and their effects for future reference. It's also recommended to work closely with your network administrator or IT support team to ensure proper configuration and troubleshooting.