PPPoE dialup service is unavailable and the network access rate is low


Root cause:
1. The AR router is tested. The test result shows that the router can normally forward packets, and the forwarding bottleneck is reached sometimes.
2. According to analysis of obtained packets, the TCP connection has been established and enters the data obtaining phase. However, the device receives RST packets (No. 15136 and No. 15137) from the Internet. As a result, the TCP connection is torn down.
1. The networking where the PC is connected to the Internet through the router is tested and services are also abnormal.
2. The networking where the PC is connected to the Internet is tested and no fault occurs. Therefore, the PC works properly.
3. Run the tcp adjust-mss command to set the TCP MSS of the dialup interface to 1400, 1200, or 900. The fault persists.
4. In the networking where the PC is connected to the Internet through the router, services are still abnormal. Run the display health and display interface commands. The command outputs show that the CPU usage and uplink bandwidth usage of the interface are normal, and the interface works in full-duplex mode through negotiation.
5. Run the display fe slot 0 fe-id 0 fwd-status all command to check the packet forwarding status of the device. No severe packet loss occurs.
6. Run the display session number command to check the number of session entries on the device. In peak hours, the number of session entries reaches 16K.
7. Optimize NAT deployment on the intranet interface so that the number of session entries is smaller than the maximum value and users can normally access the Internet.

Other related questions:
The speed of Internet access through PPPoE dialup is slow
The MTU of the PPPoE dialer interface is 1492 bytes. When the length of Layer 3 packets sent from this interface is larger than the MTU and non-fragmentation is configured, packets cannot be sent out and the Internet access speed is low. You can run the tcp adjust-mss value command on the dialer interface to modify the MSS (Max Segment Size) during TCP negotiation so that the packet length is shorter than the MTU of the dialer interface. Then packets can be properly processed and Internet access is smooth.
For example, change the MSS of the dialer interface to 1200.
<Huawei> system-view
[Huawei] interface dialer 0
[Huawei-Dialer0] tcp adjust-mss 1200

When an AR router is used as the PPPoE client, the Internet access rate of the LAN users connected to the device is low
In the dialer interface view, run the tcp adjust -mss value command to set the maximum TCP segment size of the interface. In scenarios of PPPoE application, it is recommended that the value used in the tcp adjust -mss command should be 1200. The maximum transmission unit (MTU) of the PPPoE interface is 1492 bytes. If the packets which are forwarded in Layer 2 and transmitted upward through the interface are larger than the MTU size and cannot be fragmented as configured, the packets cannot be sent, which results in the low Internet access rate of users. In this case, you can run the tcp adjust -mss command in the dialer interface view to modify the maximum segment size (MSS) value determined in the TCP negotiation phase, ensuring that the packet size is smaller than the MTU size of the dialer interface so that the packets can be processed properly and improving the Internet access rate.

Wavelength recommendations for low-rate and high-rate services
For optical-layer ASON, shorter wavelengths are recommended for low-rate services, and longer wavelengths are recommended for high-rate services. This ensures better performance for optical-layer services.

Do TE series endpoints support network access in PPPoE mode
TE series endpoints support PPPoE dial-up. To implement this function, log in to the web interface of the endpoint, choose System Settings > Network, access the IP page, enable the PPPoE function, and set Dialing mode, User name, and Password.

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