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External sources (not reviewed)

DHCP 的转发代理（dhcrelay）允许你把无 DHCP 服务器的子网内的 DHCP 和 BOOTP 请求转发给其它子网内的一个或多个 DHCP 服务器。

bsdmap.com

The DHCP RelayAgent (dhcrelay) allows you to relay DHCP and BOOTP requests from a subnet with no DHCP server on it to one or more DHCP servers on other subnets.