Tag Archives: DHCP

When PCs are in a different subnet than a DHCP server installed, DHCP Relay Agent can be used to forward DHCP requests from PCs to DHCP server. How to configure DHCP Relay Agent using Huawei CLI?

Let’s assume that we have the following topology:

We want our PC to acquire its IP address from the DHCP server configured on the labnarioR1 router. To do so, labnarioR2 should be configured as a DHCP Relay Agent to forward DHCP Requests and Offers between server and clients.

First, DHCP server should be configured. LabnarioR1 router will be configured to offer DHCP service for PC.

<labnarioR1>system-view 
Enter system view, return user view with Ctrl+Z.
[labnarioR1] dhcp enable
[labnarioR1] ip pool 1
[labnarioR1-ip-pool-1] gateway-list 172.16.1.1
[labnarioR1-ip-pool-1] network 172.16.1.0 mask 255.255.255.0
[labnarioR1-ip-pool-1] dns-list 150.100.15.1 150.100.15.2
[labnarioR1-ip-pool-1] domain-name labnario.com
[labnarioR1-ip-pool-1] quit
[labnarioR1]interface Ethernet0/0/0
[labnarioR1-Ethernet0/0/0]dhcp select global

Let’s assume that we have a topology like in the picture:

1. IP addresses of ETH 0/1 and ETH 0/2 on Router A are 172.16.1.128/25 and 172.16.1.1/25 respectively.
2. Router B (dhcp client) obtains static IP address, gateway address and DNS server address from DHCP server (router A). A MAC address of interface ETH 0/0 of router B is 0800-6902-01FC.
3. DHCP server assigns IP addresses to clients in subnet 172.16.1.0/24 subnetted to 172.16.1.1/25 and 172.16.1.128/25.
4. DNS server address and WINS server address are 172.16.1.10/25 and 172.16.1.200/25 respectively.
5. For subnet 172.16.1.128/25 configure DNS server address, WINS server address, gateway address and address lease duration for 6 days and 6 hours.
6. For subnet 172.16.1.1/25 configure DNS server address, gateway address and address lease duration for 10 days.