Method and system for balancing a traffic load in a half-duplex environment
View Patent ↗A method and system are provided for balancing a server's traffic load in an internet protocol (IP) based half-duplex network that uses an address resolution protocol (ARP) for address resolution. The server includes multiple network interface cards (NICS) that are used for communicating with multiple clients. The server may be accessible either directly to a client or indirectly to a client via a router or gateway. The clients, router, or gateway may store a single IP address identifying the server. The method comprises sending outbound traffic via some of the NICs and receiving inbound traffic via another of the NICs. To achieve this, the server is configured so that certain NICs are used only for outbound traffic and another NIC is used only for inbound traffic. This prevents a single NIC from both sending and receiving traffic, and minimizes the impact of inbound traffic on the server's overall throughput.
1. A method for balancing a traffic load on a server in a half-duplexed internet protocol (IP) based network that uses an address resolution protocol (ARP) for address resolution, wherein the server includes at least first, second, and third network interface cards (NICS), and wherein the server is accessible either directly to a client that stores a single IP address identifying the server or indirectly to a client via a router or gateway that stores a single IP address identifying the server, the method comprising:
sending outbound traffic only via the first and second NICs, wherein the server is configured to only send and to disallow receipt of traffic via the first and second NICs; and
receiving inbound traffic only via the third NIC, wherein the server is configured to only receive and to disallow receipt of traffic via the third NIC, so that an impact of the inbound traffic on the server will be minimized.
2. The method of claim 1 further comprising balancing the outbound traffic between the first and second NICs.
3. The method of claim 1 wherein the balancing is accomplished using a random load balancing process that does not account for actual load on a given NIC.
4. The method of claim 3 wherein the random load process uses a packet-based methodology.
5. The method of claim 1 further comprising:
receiving an address request from the directly connected client, router or gateway; and
responding to the address request with an identifier associated with the third NIC, so that inbound traffic is directed to the third NIC.
6. A method for balancing a traffic load on a server in a network that uses an address resolution protocol (ARP) for address resolution, wherein the server includes at least first, second, and third data paths, and wherein the server is accessible either directly to a client or indirectly to a client via a router or gateway, the method comprising:
configuring the server to send outbound traffic to the clients only via the first data path and the third data path and to disallow outbound traffic from being sent to the clients via the second data path; and
configuring the server to receive inbound traffic from the clients only via the second path and to disallow inbound traffic from being received from the clients via the first data path and the third data path, wherein the first, second, and third data paths will not become congested as a result of both sending and receiving traffic via a single data path.
7. The method of claim 6 further comprising:
configuring the server to send outbound traffic to the clients via a third datapath and balancing the outbound traffic between the first and third data paths.
8. The method of claim 7 wherein the balancing includes sending packets to a single client using both the first and third data paths.
9. The method of claim 6 further comprising:
receiving an address request either directly from a client or indirectly from a client via the router or gateway; and
responding to the address request with an identifier associated with the second data path.
10. The method of claim 6 further comprising defining each of the first, second, and third data paths by a network interface card that is associated with a media access control address.
11. The method of claim 6 wherein the directly connected client, the router, and the gateway each store a single internet protocol address identifying the server, so that each must direct data to the server via the data path associated with the internet protocol address.
12. A system for maintaining a traffic load balance in a half-duplex environment, wherein the environment includes a server accessible to clients via a router or gateway, wherein the router or gateway stores a single network address for the server, system comprising:
a processor;
first, second, and third data interfaces for connecting the first processor to the clients; and
a memory accessible to the processor for storing instructions, the memory containing instructions for:
sending only outbound traffic to the clients via the first data interface and the third data interface; and
receiving only inbound traffic from the clients via the second data interface;
wherein outbound traffic to the clients is excluded from the second data interface and wherein inbound traffic from the clients is excluded from via the first data interface and the third data interface.
13. The system of claim 12 wherein the environment is an internet protocol (IP) based network, and the first, second, and third data interfaces are defined by first, second, and third network interface cards, respectively.
14. The system of claim 12 further comprising instructions for balancing the outbound traffic between the first and third data interfaces.
15. The system of claim 14 further comprising instructions for configuring the first and third interfaces for only sending traffic and configuring the second interface to only receive traffic.