ARP for logical router

摘要

Some embodiments provide a method for a computing device serving as a host machine in a logical network. The method executes several virtual machines that are in several different segments of the logical network. The method operates a managed physical routing element (MPRE) for routing data packets between different segments of the logical network. The MPRE includes several logical interfaces, each of which is for receiving data packets from a different segment of the logical network. Each of the logical interfaces is addressable by a network layer address. The method intercepts an Address Resolution Protocol (ARP) broadcast message when the destination address matches the network address of one of the logical interfaces. The method formulates an ARP reply to the ARP broadcast message.

主权项

1. A computing device serving as a host machine in a logical network, the computing device comprising:
a set of processing units; and a non-transitory machine readable medium storing a program for execution by at least one processing unit, the program comprising sets of instructions for:
executing a plurality of virtual machines that are in a plurality of different segments of the logical network;operating a managed physical routing element (MPRE) for routing data packets between different segments of the logical network, the MPRE comprising a plurality of logical interfaces, each logical interface for receiving data packets from a different segment of the logical network, wherein each of the logical interfaces is addressable by a network layer address;intercepting an Address Resolution Protocol (ARP) broadcast message when a network layer destination address of the message matches the network layer address of one of the logical interfaces of the MPRE; andformulating and delivering an ARP reply based on a MAC (Media Access Control) address of the matching logical interface to the ARP broadcast message.