Configuring PPPoE, NAT, and DHCP on Huawei AR2220 Router (WAN‑Only Model)

Applicable Model: Huawei AR2220 (WAN‑only device).

Business Requirement: ISP provides PPPoE credentials (user1 / huawei123) and internal users must access the external network.

Network Topology: GE1 connects to the ISP (WAN), GE2 connects to the LAN (IP 192.168.1.1/24). LAN hosts obtain IPs via DHCP.

WAN Side Configuration

1. Create a PPPoE dialer interface and enable CHAP/PAP authentication.

system-view

interface dialer 1

dialer user abc

dialer bundle 1

dialer number 1 autodial

ppp chap user user1

ppp chap password cipher huawei123

ppp pap local-user user1 password cipher huawei123

tcp adjust-mss 1200

ip address ppp-negotiate

ppp ipcp dns admit-any

quit

2. Bind the dialer to the WAN interface (GE1) and start the PPPoE client.

interface gigabitethernet 0/0/1

pppoe-client dial-bundle-number 1

quit

3. Add a default static route via the dialer.

ip route-static 0.0.0.0 0.0.0.0 dialer 1

4. Configure NAT to translate LAN traffic to the WAN.

acl number 3000

rule permit ip

quit

interface dialer 1

nat outbound 3000

quit

LAN Side Configuration

Enable DHCP globally and configure the LAN interface (GE2) with IP address and subnet mask.

dhcp enable

interface gigabitethernet 0/0/2

ip address 192.168.1.1 255.255.255.0

dhcp select interface

dhcp server dns-list 114.114.114.114

return

After completing these steps, internal users will obtain IP addresses via DHCP and be able to access the Internet through the configured PPPoE connection.