COMMUNICATION CONTROL METHOD AND SYSTEM
First Claim
1. A communication control system which controls packet exchange between a plurality of closed networks and physically one shared server, where server addresses unique to the respective closed networks are assigned to the shared server, comprising:
- a switch having a plurality of physical ports to be connected to the respective closed networks and a gateway side port; and
a gateway connected between the switch and the shared server, whereinthe switch includes;
means for attaching an ID tag unique to each physical port to a packet input from each physical port and outputting it from the gateway side port; and
means for outputting the packet input from the gateway side port, from the physical port corresponding to the ID tag attached to the packet, andthe gateway includes;
a conversion table for managing correspondences between ID tags and server addresses;
means for detecting an ID tag attached to a packet addressed to the gateway received from the switch;
a first searching means for searching for a server address corresponding to the detected ID tag from the conversion table;
a first packet modifying means for modifying a destination address of the packet into the searched server address;
a second searching means for searching for an ID tag corresponding to a source address of a packet addressed to a closed network received from a shared server from the conversion table; and
a second packet modifying means for attaching the searched ID tag to the packet received from the shared server and modifying the source address into a gateway address.
1 Assignment
0 Petitions
Accused Products
Abstract
A switch 1 having a tag VLAN function includes a plurality of physical ports P1, P2 . . . , and adds an ID tag unique to each physical port to the header of a packet received by the physical port and sends the packet, and on the other hand, refers to an ID tag attached to a packet received from a GW 2 and sends the packet to a physical port corresponding to the ID tag. The GW 2 searches for a server address corresponding to the ID tag attached to the packet received from the switch 1 and modifies a destination address of the packet into the server address. In addition, the GW 2 attaches an ID tag corresponding to a source address of the packet received from the shared server 3 to the received packet, and modifies the source address of the packet into a GW address.
17 Citations
3 Claims
-
1. A communication control system which controls packet exchange between a plurality of closed networks and physically one shared server, where server addresses unique to the respective closed networks are assigned to the shared server, comprising:
-
a switch having a plurality of physical ports to be connected to the respective closed networks and a gateway side port; and a gateway connected between the switch and the shared server, wherein the switch includes; means for attaching an ID tag unique to each physical port to a packet input from each physical port and outputting it from the gateway side port; and
means for outputting the packet input from the gateway side port, from the physical port corresponding to the ID tag attached to the packet, andthe gateway includes; a conversion table for managing correspondences between ID tags and server addresses; means for detecting an ID tag attached to a packet addressed to the gateway received from the switch;
a first searching means for searching for a server address corresponding to the detected ID tag from the conversion table;a first packet modifying means for modifying a destination address of the packet into the searched server address;
a second searching means for searching for an ID tag corresponding to a source address of a packet addressed to a closed network received from a shared server from the conversion table; anda second packet modifying means for attaching the searched ID tag to the packet received from the shared server and modifying the source address into a gateway address. - View Dependent Claims (2)
-
-
3. A communication control method in which a plurality of closed networks are connected to physically one shared server via a switch and a gateway, and server addresses unique to the respective closed networks are assigned to the shared server, comprising the steps of:
-
a host in a closed network transmitting a packet including a host address as a source address and a gateway address as a destination address, as a packet addressed to the shared server; the switch attaching an ID tag unique to the physical port to a packet input into a physical port from a closed network and transferring the packet; the gateway searching a server address corresponding to the ID tag attached to the packet received from the switch; and the gateway modifying the destination address of the packet into the searched server address and transferring the packet; the shared server transmitting a packet including the server address as a source address and the host address as a destination address; the gateway searching an ID tag corresponding to the source address of the packet received from the shared server; the gateway attaching the searched ID tag to the packet received from the shared server, modifying the source address of the packet into a gateway address, and transferring the packet; and the switch transferring the packet received from the gateway from a physical port corresponding to the ID tag attached to the packet.
-
Specification