ICMP translator
US8477804B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 2007 |
| Grant date | Jul 2, 2013 |
| Priority date | — |
| Expiry date | May 4, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2101/686
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
When an IPv4/v6 dual stack terminal communicating via TCP on IPv6 fails to promptly switch over to IPv4 after the ICMPv6 fails due to a soft error, the problem should be resolved at the prior stage server rather than on the complicated terminal. The server at a stage prior to the terminal receives TCP packets from the terminal to find the TCP connection status on the terminal. When the terminal connection status is SYN-SENT or SYN-RECEIVED, and the server receives an unaddressed soft error such as ICMPv6 “Destination Unreachable: no route to destination (ICMP type=1: code 0)” for that terminal, the server rewrites the ICMPv6 contents as a hard error such as “Destination Unreachable: communication with destination administratively prohibited (ICMP type=1: code 1)” and sends it the terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.