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IPv6 over IPv4 tunnel switching method and device

A tunnel and equipment technology, applied in the field of IPv6over IPv4 tunnel switching, can solve the problems of unable to send ICMPv6 unreachable messages, unable to directly switch routes, unable to resolve the original IPv6 source address, etc., to speed up, realize dynamic adjustment, and rational use The effect of the tunnel resource

Inactive Publication Date: 2009-11-04
NEW H3C TECH CO LTD
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of tunnel encapsulation, 8 bytes cannot cover the address part of the IPv6 header, so that when the source end of the tunnel receives an IPv4 unreachable message, it cannot resolve the original IPv6 source address, and cannot send ICMPv6 unreachable message
[0016] Secondly, for an IPv6 host, even if it receives an ICMPv6 unreachable message, the only action it can take is to give a prompt message on the user interface or stop sending packets, and it cannot directly switch the route.

Method used

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  • IPv6 over IPv4 tunnel switching method and device
  • IPv6 over IPv4 tunnel switching method and device
  • IPv6 over IPv4 tunnel switching method and device

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Embodiment Construction

[0050] The core idea of ​​the present invention is: the tunnel source device calculates the initial priority of each tunnel according to the preset IPv6over IPv4 tunnel priority calculation rules; Available tunnels, select the tunnel with the highest current priority among the available tunnels to send the IPv6 packet; when the tunnel source device receives an ICMPv4 unreachable message for the selected tunnel, reduce the current priority of the tunnel.

[0051] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0052] figure 2 The flow chart of the method for IPv6over IPv4 tunnel switching provided by the embodiment of the present invention, as figure 2 As shown, the specific steps are as follows:

[0053] Step 201: Preset the calculation rule of IPv6over IPv4 tunnel priority, and the tunnel source device calculates the initial priority of each tunnel according to the calculation rule. ...

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Abstract

The invention discloses an IPv6 over IPv4 tunnel switching method and a device. The method includes: a tunnel source device calculates initial priority of each tunnel according to preset IPv6 over IPv4 tunnel priority calculation rule; when the tunnel source device is about to send an IPv6 message, available tunnels capable of transporting the message are searched, and the IPv6 message is sent by the tunnel with the highest priority in the available tunnels; and when the tunnel source device receives an ICMPv4 unreachable message direct to the selected tunnel, the current priority of the tunnel is reduced. The invention realizes the IPv6 over IPv4 tunnel switching.

Description

technical field [0001] The invention relates to the technical field of tunnels, in particular to an IPv6over IPv4 tunnel switching method and equipment. Background technique [0002] The IPv6over IPv4 tunnel mechanism is to encapsulate the IPv4 packet header before the IPv6 data packet, and make the IPv6 packet traverse the IPv4 network through the tunnel to realize the intercommunication method of the isolated IPv6 network. [0003] figure 1 It is a schematic diagram of an existing IPv6 packet traversing an IPv4 network through an IPv6over IPv4 tunnel, such as figure 1 As shown, the process is as follows: [0004] 01. A device in the IPv6 network sends an IPv6 packet to the source device of the tunnel. [0005] 02. The source device of the tunnel judges that the message should be forwarded through the IPv6over IPv4 tunnel according to the routing table, and encapsulates the IPv4 message header before the IPv6 message. The source address in the IPv4 message header is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/46H04L45/741
Inventor 黄哲
Owner NEW H3C TECH CO LTD
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