Configuring the Source IP Address of a DHCP Client Packet on the DHCP Relay Agent

You can enable the DHCP server to know the source subnet or network of a DHCP client packet.

By default, a DHCP relay agent forwards a DHCP client packet with the source IP address set to the IP address of the outgoing interface to the DHCP server. You can configure ACLs on a DHCP server to provide or block DHCP services to particular subnets or networks. The ip bootp-use-intf-ip command configures a DHCP relay agent to set the source IP address of a DHCP client packet with the IP address of the incoming interface for the packet. This reveals the source subnet or network of a DHCP client packet to the DHCP server and enables the DHCP server to process or discard the DHCP traffic according to the configured ACLs.

  1. Enter the ip bootp-use-intf-ip command in global configuration mode of the DHCP relay agent. 
    device(config)# ip bootp-use-intf-ip
Parent topic: DHCP Option 82 Configuration