Router using remote address resolution to enable bridge like dat

Details Router using remote address resolution to enable bridge like dat Router using remote address resolution to enable bridge like dat

1991-06-14

1995-05-30

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, H04L 1246

Patent

active

054208629

ABSTRACT:
A communications system is disclosed, having a first communications link, a second communications link, a first end station attached to said first communications link, a first packet forwarding apparatus attached to the first communications link, a second end station attached to the second communications link, and a second packet forwarding apparatus attached to the second communications link. Each packet forwarding apparatus routes packets it receives having destination address equal to a data link destination address of the apparatus, and bridges all other received packets. When the first end station wishes to send a packet to the second end station, it first transmits an ARP request message to learn the data link address of the second end station. The first apparatus receives the ARP (Address Resolution Protocol) request message, and determines that the end station for which a data link address is requested is attached to a remote communications link. The first apparatus requests the second apparatus to transmit an ARP request message to determine the second station's address, and to relay the ARP response back to the first apparatus. When the first apparatus receives the ARP response, it forwards the response to the first end station. The first end station transmits subsequent packets to the second end station, using the data link address of the second end station as a data link destination address. These subsequent packets can be bridged by any intermediary apparatus between the first end station and the second end station.

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