When the device functions as a PPPoE client, why is the Internet access speed of users on the downstream LAN slow

Run the tcp adjust-mss value command in the dialer interface view to set the MSS of TCP packets on the interface.

The recommended value of tcp adjust-mss is 1200 for PPPoE applications.

The MTU of the PPPoE-enabled interface is 1492 bytes. When the MTU of outgoing Layer 3 packets on this interface is greater than 1492 bytes and the packets are configured as non-fragmented, packets cannot be sent out. The Internet access speed is slow. You can run the tcp adjust-mss value command on the dialer interface to change the Max Segment Size (MSS) value so that the packet length is smaller than the dialer interface. The packets then can be processed and this problem is solved.

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