Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Patent
1996-12-02
1999-04-06
Pham, Chi H.
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
370253, 370400, H04L 1256
Patent
active
058927530
ABSTRACT:
A local system issues an ICMP echo request packet with a size based on an initial PMTU value corresponding to that of the local system's interface MTU. When an ICMP needfrag error packet is received by the local system, this signifies that the initial PMTU value was too large for packets of corresponding size to be transmitted through the Internet without fragmentation. The value is accordingly decreased by the local system and a next ICMP echo request packet transmitted through the Internet. The process iterates until an ICMP echo request packet is successfully transmitted through the Internet to a target system. In response thereto, the target system transmits an ICMP echo response packet back through the Internet to the local system, thereby indicating that the last-sent ICMP echo request packet from the local system had the correct PMTU value which is thereafter assumed to be the correct PMTU. An MTU application, MTU table, and corresponding application program interfaces and controls are provided in the system for dynamically maintaining PMTU value estimates and for providing next estimates of PMTU. These next estimates are accessed from the table in next ICMP echo request packet transmissions when an ICMP needfrag error packet does not contain an MTU value returned from a router in the Internet.
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Badt Daniel Edward
Marquardt David Richard
Rao Satyanarayana Billekal
Russell Lance Warren
Wise Larry Steven
Carwell Robert M.
International Business Machines - Corporation
Pham Chi H.
Yao Kwang B.
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