摘要:
A system, apparatus and method of aggregating TCP-offloaded adapters are provided. When data is being transacted between a local host and a remote host, associated with the data are usually a local port and a remote port through which the data transaction is to occur. If any one or both hosts have a plurality of TCP-offloaded adapters, the adapters may be aggregated by assigning a common IP address to the adapters. Then an adapter is selected through which the data transaction will occur based on the local port and the remote port. Specifically, the port numbers of the two TCP ports are added together and modded (i.e., the sum-undergoes a modulo operation) by the number of adapters in the aggregation. The result of the modulo operation determines which TCP-offloaded adapter is used to handle the data transaction.
摘要:
DHCP lease negotiation is performed in advance of a specified time when the IP address is needed. The client sends a DHCP discover message with an advance lease option indicating a future time when an IP address is needed. The DHCP server reserves an IP address available at the requested time for the requesting client and sends a DHCP acknowledgment of the reservation. Thereafter, the client sends a DHCP discover message requesting the reserved IP address, and the DHCP server assigns it to the client at the scheduled time.
摘要:
Returning to normal power mode a sleeping device operating in low power mode, where the sleeping device is connected to a network, and the sleeping device has a network layer address and a link layer address. Typical embodiments include configuring an administrative device connected to the network with the network layer address of the sleeping device, the link layer address of the sleeping device, and a network layer address of a last router on a route to the sleeping device; instructing the router to store the network layer address of the sleeping device in association with the link layer address of the sleeping device; sending from the administrative device to the sleeping device through the router a unicast message to return to normal power mode.
摘要:
Retrieving dated content from a website including receiving a URL for dated content with a date field; inserting the current date in the date field; and retrieving the dated content with the URL bearing the current date in its date field. In some embodiments, date field bears an encoded date and inserting the current date in the date field includes replacing the encoded date with the current date. Typical embodiments also include bookmarking the URL, including replacing an encoded date in the date field with a date tag. Some embodiments include prompting the user for a date format. In many embodiments, the date tag includes a default date format. Some embodiments include configuring the browser with a default date format.
摘要:
A method, system, and program for accessing data processing systems behind a NAT enabled network are provided. According to one aspect of the present invention, a NAT data processing system is located behind a NAT enabled network with a NAT device as a gateway to the NAT enabled network. A client system located outside the NAT enabled network queries the NAT device for the address of the NAT data processing system located behind the NAT enabled network. The query is automatically routed through the NAT device to a DNS server. The DNS server then returns an address for the NAT data processing system and source routing for the NAT device. The NAT device forwards the address and source routing to the client system. Then, the client system sends packets to the NAT data processing system at the address with source routing through the NAT device, such that the NAT data processing system behind the NAT enabled network is directly accessed by the client system from outside the NAT enabled network.
摘要:
A receiving host in a TCP/IP network sends an acknowledgment indicating a received data packet is corrupt. The sending host will begin transmitting with a new field set in the IP header called a check-TCP-checksum bit, thereby requesting that all routers in the TCP/IP network perform a checksum on the entire received packet. Routers in the TCP/IP network will perform a complete checksum on an entire packet with the check-TCP-checksum bit set, and not just on the IP header. The routers continuously monitor the ratio of corrupt packets received on a particular port that fail the entire packet checksum to the total number of packets received on that port. If the ratio of corrupt-to-received packets exceeds a corruption threshold, the router assumes that the associated link is causing data corruption and issues a routing update indicating that the link is bad and should be avoided. Once the retransmission rate between the sender and receiver drops below a threshold level, the bad link has been detected and avoided within the TCP/IP network and the check-TCP-checksum option in the IP header is no longer set in data packets transmitted to the receiver host.
摘要:
A method and system for self-healing of routers within a distributed computer network. In response to a detected communication error at a local router over a primary communication path to a distant router, an alternate path is established. Thereafter, a diagnostic process is initiated in the distant router via the alternate path. Communication settings are then reconfigured in the distant router and communication via the primary communication path is tested. If communication is restored, the new communication settings are made permanent. If communications via the primary path are not restored, alternate communication settings are attempted in the local router and communication is tested again. If communication is re-established via the primary path, the new communication settings are made permanent.
摘要:
A resolver queries a DNS server for any network addresses associated with the particular domain name. If the resolver detects a response for the DNS server with multiple network addresses for a particular domain name, then the resolver creates and sends a shortest path query to at least one router enabled to receive and respond to shortest path queries. The shortest path query indicates at least one source address and the multiple destination addresses returned by the DNS server for the particular domain name. The router detects a separate length for each path accessible between each source address and each of the multiple destination addresses. The router then orders the destination addresses from shortest path to longest path and returns the ordered destination addresses to the requesting resolver. The resolver caches the ordered network addresses in the local cache in association with the particular domain name, such that for future requests for the particular domain name, the resolver retrieves from local cache the shortest path network address as ordered by the router. In addition, the resolver, responsive to receiving the ordered destination addresses, selects the shortest path network address for a response to an application requesting the resolution of the particular domain name.
摘要:
A method and system for self-healing of routers within a distributed computer network. In response to a detected communication error at a local router over a primary communication path to a distant router, an alternate path is established. Thereafter, a diagnostic process is initiated in the distant router via the alternate path. Communication settings are then reconfigured in the distant router and communication via the primary communication path is tested. If communication is restored, the new communication settings are made permanent. If communications via the primary path are not restored, alternate communication settings are attempted in the local router and communication is tested again. If communication is re-established via the primary path, the new communication settings are made permanent.
摘要:
A method, system, and program for redirecting client connection requests among sockets providing a same service are provided. An application requests multiple sockets from a kernel. In addition, the application generates a socket call option to bind the sockets to a particular port number and passes a list of the sockets to the kernel, where the list indicates that the sockets will all provide access to server systems providing the same service. In response, the kernel sets up the sockets, bound to the same port, and set to reference one another. Then, when a connection request is received for a first socket in the list with a queue that is full, the kernel redirects the connection request to a second socket in the list with available queue space. Thus, rather than drop the connection request from the first socket when it lacks available queue space, the connection request is redirected to another socket providing access to the same service.