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.
Procedure:
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.

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