PPPoE simulation feature of the access network


In Point-to-Point Protocol over Ethernet (PPPoE) simulation, a PPPoE dialup process is initiated on an access device by simulating a user client. PPPoE simulation checks the network connectivity between the access device and the broadband remote access server (BRAS) based on analysis of the simulation results. It is primarily used in deployment acceptance and fault locating scenarios.
PPPoE simulation is performed by remotely logging in to an access device. Whether PPPoE user services can be normally provisioned is determined based on the simulation results.
Maintenance engineers remotely log in to the access device to perform PPPoE simulation, preliminarily locate the network segment in which the fault occurs, and then determine the fault causes and take relevant actions based on the simulation results.

Other related questions:
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.

ARP proxy feature of the access network
When a PC sends an Address Resolution Protocol (ARP) request to another PC, the request is processed by the access device connected to the 2 PCs. This process is called ARP proxy. ARP proxy is often used for communication between the sub virtual local area networks (VLANs) in a super VLAN.

Whether the TE30 supports network access using PPPOE
To connect the TE30 to the network using PPPoE, perform the following operations: 1. Log in to the endpoint web interface and choose System Settings > Network > IP. 2. Set parameters as follows: - Set Enable PPPoE to Enable. - Set Dialing mode to Manual or Auto. - In the User name and Password fields, enter the user name and password obtained from the broadband access service provider respectively.

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.

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

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