Methods and devices for routing data packets between IPv4 and IPv6 networks
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United States of America Patent
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Apr 28, 2015
Grant Date -
Aug 16, 2012
app pub date -
Oct 20, 2010
filing date -
Oct 30, 2009
priority date (Note) -
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Abstract
A data packet routing system is provided wherein: at least one terminal belonging to a private IPv4 network is connected to a gateway itself connected to an IPv6 network; at least one interface device at the interface between said IPv6 network and a public IPv4 network implements a translation function comprising exchanging a private IPv4 address with a public IPv4 address. The gateway allocates to the terminal an IPv6 address by providing an IPv6 prefix with the private IPv4 address of the terminal in its private IPv4 network; said gateway verifying whether IPv4 address conflict exists, and if IPv4 it does exist, for replacing said private IPv4 address locally with a substitute private IPv4 address. A method is provided that routes an IPv4 data packet sent by a source terminal belonging to a first IPv4 domain via an IPv6 domain to a destination terminal belonging to a second IPv4 domain.
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