Configuration note when the AR G3 series is used as the PPPoE client


Configuration note when the AR G3 series is used as the PPPoE client:
When dual uplink is used, you are not advised to configure load balancing based on equal-cost routes. If the AR connects to networks of two carriers, the packet delay is different, causing packet mis-sequencing and retransmission. The Internet access is slow.

Other related questions:
Method used to configure DHCP client on the AR
The AR can function as a DHCP client to dynamically obtain configuration parameters such as an IP address from a DHCP server. This reduces the configuration costs and the errors and facilitates centralized management. Assume that RouterA functions as the DHCP client and RouterB as the DHCP server. The configuration is as follows: 1. Configure RouterA. [HUAWEI] dhcp enable //Enable the DHCP function. [HUAWEI] interface GigabitEthernet0/0/0 [HUAWEI-GigabitEthernet0/0/0] ip address dhcp-alloc //Enable the DHCP client on an interface. [HUAWEI-GigabitEthernet0/0/0] quit 2. Configure RouterB. [HUAWEI] dhcp enable //Enable the DHCP function. [HUAWEI] ip pool p1 [HUAWEI-ip-pool-p1] gateway-list //Configure the gateway IP address. [HUAWEI-ip-pool-p1] network mask //Specify the range of IP addresses that can be dynamically allocated in the global address pool. [HUAWEI-ip-pool-p1] quit [HUAWEI] interface GigabitEthernet0/0/0 [HUAWEI-GigabitEthernet0/0/0] ip address [HUAWEI-GigabitEthernet0/0/0] dhcp select global //Configure the global address pool mode. 3. Verify the configuration. Run the display ip interface brief command on RouterA to view the IP address that GE0/0/0 has obtained.

The PC connected to the DHCP server cannot obtain DNS information when the AR1220 serves as the PPPoE client
The AR used as the DHCP server cannot assign information about the DNS server obtained from the PPPoE server to DHCP clients. 1. Run the ppp ipcp dns admit-any command on the dialer interface to configure the AR to receive the IP address of the DNS server specified by the remote device. If the command is not configured, the AR cannot obtain DNS information. 2. DNS proxy is used to meet customers' requirements. Run the following commands in the system view: dns resolve dns proxy enable In the IP pool view, dns-list is configured as the address of the AR. In this way, the AR is equivalent to the DNS server for a PC. After receiving a DNS request, the AR sends it to the DNS server to complete domain name resolution.

Method used to configure the DDNS clients on AR series routers
A Huawei AR (except for the AR 550) supports the DDNS client function. When the IP address mapping the domain name is changed, the DDNS client can notify the DNS server of updating the mapping between domain names and IP addresses on the DNS server to ensure that users can successfully access the servers on the network using domain names. The AR used as the DDNS client supports update through DDNS (defined by RFC 2136) and the DDNS server. DDNS update defined by RFC 2136: The AR used as the DDNS client directly updates the mapping between domain names and IP addresses on the DNS server. This function has been available since V200R005C10. Update through the DDNS server: The AR used as the DDNS client sends the mapping between domain names and IP addresses to the DDNS server with the specified URL. Then the DDNS server notifies the DNS server of dynamically updating the mapping between domain names and IP addresses. The AR can connect to DDNS servers from DDNS service providers,, and, Siemens DDNS server, and common DDNS servers that use HTTP. There is no difference in the DDNS configuration between different models and versions of AR series routers. For details about the configuration process, see Configuration Guide - IP Service - DNS.

Does VLANIF interfaces of the AR router support the PPPoE client
The PPPoE client cannot be configured on a VLANIF interface, but the PPPoE server can be configured on the VLANIF interface.

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.

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