Method and device for determining maximum transmission unit
A maximum transmission unit and mobile node technology, applied in the field of network communication, can solve problems such as delayed service response time, re-establishment, data message discarding, etc., and achieve the effect of improving service response speed and shortening service response time
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Embodiment 1
[0055] Negotiation Embodiment 1: In the case that the MN can know the CN of the peer node communicating with it and the lifetime of the MTU, the MN triggers a negotiation process and negotiates the MTU with the CN.
[0056] The MN can obtain all the CNs it has communicated with by recording the information of the CNs it has communicated with. Of course, the MN can also obtain the CN information from the network device. The lifetime of the MTU can be maintained by the MN.
[0057] image 3 In , when the MN migrates to a new access network, or during the migration process of the MN between access networks, the MN can obtain its new address from the access gateway or foreign agent before the migration, that is, the MN can access Before the target accesses the network, it obtains an address that can be used in the target access network, and the address may be called a care-of address. At the same time, the MN can also obtain the MTU value of the migrated access network from the...
Embodiment 2
[0061] Negotiation Embodiment 2: The HA triggers the negotiation process, and negotiates the MTU of the MN with the CN.
[0062] Figure 4In the above, the HA can know the access network migration of the MN at any time. The HA can obtain the MTU supported by the target access network through the tunnel establishment negotiation process with the target gateway. HA can also learn the MTU based on pre-configuration and information obtained from the policy center. The HA can also learn the MTU according to the interaction with the MN. After learning the MTU supported by the target access network, the HA can negotiate the MTU with the CN in two different ways.
[0063] Mode 1: The HA triggers the process of the CN learning the MTU, and responds to the request in the process of the CN learning the MTU on behalf of the MN. For example, when the CN wants to communicate with the MN through the HA, if the size of the data packet sent by the CN exceeds the MTU value supported by the ...
Embodiment 3
[0067] Negotiation Embodiment 3: The gateway in the access network triggers the negotiation process.
[0068] Figure 5 In the process, the GWB notifies the neighbor gateway GWA of the change of the MTU of the MN using a routing protocol, and the CN sends a data packet with the destination address of the MN to the GWA. After receiving the data message and determining the MTU of the MN after the size change of the data message, the GWA discards the data message and sends an ICMP oversized error message to the CN. The changed MTU of the MN is learned after the error message.
[0069] In addition, the access network gateway may also directly notify the HA or CN of the negotiated MTU. For example, the access network gateway may notify the HA or CN through the process of establishing a tunnel with the HA, or through the proxy binding process of the mobile IP performed by the MN through the GW. Of course, the access network gateway can also use newly defined procedures and protoc...
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