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Disclosed is a method to improve Transmission Control Protocol (TCP) performance and provide selection of a better route when a packet drop occurs in a router due to link layer errors.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
57% of the total text.
Page 1 of 1
A method to provide Data Corruption Error Notification in routers .
Link layer error detection is performed at the physical layer for every packet sent on the
network. A typical Internet Protocol (IP) datagram, goes through this link layer error
check at every router along the path from the source to the destination. If a router
encounters a link layer error in an IP datagram it discards it. If the discarded packet is
TCP, which is usually the case in wireless networks, this packet drop causes the sender
TCP to assume congestion in the network and reduce its congestion window into half
and thereby reduce TCP performance.
The disclosed method would work as follows. When a router encounters a link layer
error in a packet, the adapter instead of discarding the packet, delivers the packet to IP
layer. The IP header of the packet contains a checksum of the IP header. If this
checksum is valid, the router obtains the source and destination information from the IP
header. A new Internet Control Message Protocol (ICMP) error message type for link
layer error is defined. The router sends this ICMP link layer error message to the source
with destination information. On receiving this ICMP error message, ICMP informs the
TCP layer about the packet drop due to link layer error and not to reduce the congestion
window into half when a packet drop is detected. This improves TCP performance.
To implement this method, a new ICMP error message type, ICMP_DATA_CORRUPT
is defined. I...