System and method for address resolution

摘要

This invention provides an optimal transmission connection even if a VC (Virtual Connection) resource of a receiving ATM (Asynchronous Transfer Mode) terminal is insufficient by making ATM terminals participate in an address resolution, while maintaining compatibility with operations according to NHRP (Next Hop Resolution Protocol) and ATMARP (Asynchronous Transfer Mode Address Resolution Protocol). When a NHS (Next Hop Server) receives a NHRP reply packet indicating a rejection response from a destination ATM terminal, the NHS judges its VC resource condition. If the NHS judges that its VC resource condition is sufficient for connecting, the NHS sends a NHRP reply packet including its ATM address. When the NHS judges that its VC resource condition is insufficient for connecting, the NHS sends the NHRP reply packet indicating the rejection response without modification. The NHRP reply packet is sent to an origin ATM terminal via other NHS's. A VC setting and data transmission after this is determined based on the reply packet.