Huawei EchoLife HG520 User Manual page 40

Figure 4-12 DHCP Sever Setting
2) DHCP Relay
DHCP relay is a relay agent for DHCP packets. It is used on a
subnet with DHCP clients to "relay" their requests to a subnet that has
a DHCP server on it. Because DHCP packets can be broadcast, they
will not be routed off of the local subnet. The DHCP relay takes care of
this for the client.
Enter the DHCP Server IP address and click "Submit" to activate
the settings. This function does not work when the PVC setting of NAT
feature is configured in the HG520.
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