Methods for modifying a switching table of an Internet Protocol (IP) switch. The methods include: receiving a dynamic host configuration protocol (DHCP) option 43 request from a host of a LAN at an access port of the IP switch; transmitting the request to a DHCP server; intercepting a DHCP response for the request from the DHCP server; extracting an IP address from the intercepted DHCP response; and adding the extracted IP address to a corresponding entry (specific to the access port) of a switching table of the IP switch. The methods include: receiving an IP frame at an access port of the IP switch; reading an IP source address from the IP frame; and in the switching table either: creating a new entry including the IP source address and its associated port identifier or changing an existing entry based on the IP source address and the access port.