Peer mobile router authentication method, and multiple peer care-of addresses registration method, and mobile router failover method for multi-homed mobile networks

A method for registering multiple CoAs of a first MR which is authenticated by a method of authenticating a peer mobile router (MR), where the method of authenticating a peer MR comprising the steps of:

• a) determining whether a second MR that allows a peering relation to a first MR is around a first MR;
• b) at the first MR, transmitting a peer request message to the second MR for making a peer relation to the second MR;
• c) at the first MR, requesting a home agent (HA) of the first MR to authenticate the second MR in response to a peer request response from the second MR;
• d) at the HA, transmitting a peer mobile router registering request message to the second MR with a prefix of the first MR that transmit the authentication request message to perform return routability (RR) authentication;
• and
• e) at the HA, notifying the authentication result of the second MR to the first MR when receiving a RR authentication result message including the prefix of the first MR to be registered as a peer from the second MR, where the RR authentication result message is a peer mobile router registering request response message,
• wherein the second MR registers a CoA of the first MR to a home agent of the second MR as one of multiple CoAs using information of the first MR which is a peer router of the second MR, but registers a CoA only for a prefix of the first MR.

A failover method for failure of a second mobile router (MR) when a CoA of a first MR that is a peer MR is registered to a home agent (HA) of the second MR by a method for registering multiple CoAs, the failover method comprising the steps of:

• a) transmitting a proxy binding update message from the first MR to a HA of the second MR when the second MR notices the first MR with the failure of the second MR, information of a current failed primary CoA is updated in a binding cache of the HA;
• b) at the first MR, notifying the second MR that the first MR functions as a proxy and creating a tunnel to the HA;
• c) providing a service through the created tunnel;
• d) at the second MR, notifying that the MR2 is recovered from the failure to the HA through a binding update message when the second MR is recovered from the failure, and at the HA, notifying the first MR, which is set as a backup among backup CoAs in a binding cache, that the second MR is recovered through a recovery notify message;
• and
• e) deleting a tunnel formed between the first MR and the HA and updating the binding cache of the HA.

A recovery method for recovering a second mobile router (MR) from failure when a CoA of a first MR that is a peer to the second MR is registered at a home agent (HA) of the second mobile router by a method of registering multiple CoAs, the recovery method comprising the steps of:

• a) updating information about a current failed primary CoA to a binding cache of the home agent HA by transmitting a proxy binding update message to a HA of the second MR from the first MR capable of providing a proxy service if a “ICMP host unreachable” message is returned from the second MR after transmitting a message for a non-exist port to a CoA of the second MR when a RA message is not received from the second;
• b) at the first MR, forming a tunnel between the first MR to the HA of the second MR;
• c) providing a service through the formed tunnel;
• d) at the second MR, notifying the HA through a binding update message that the second MR is recovered from a failure when the second MR is recovered, and, at the HA, notifying the first MR, which is set as backup among backup CoAs in a binding cache, through a recovery notify message that the second MR is recovered from the failure;
• and
• e) deleting the formed tunnel between the first MR and the HA, and updating the binding cache of the HA.

A computer readable recording medium storing a program for executing a method for registering a mobile router (MR) in a multi-homing NEMO network system including multiple mobile routers, comprising the functions of:

• a) determining whether a second MR that allows a peering relation to a first MR is around a first MR;
• b) at the first MR, transmitting a peer request message to the second MR for making a peer relation to the second MR;
• c) at the first MR, requesting a home agent (HA) of the first MR to authenticate the second MR in response to a peer request response from the second MR;
• d) at the HA, transmitting a peer mobile router registering request message to the second MR with a prefix of the first MR that transmit the authentication request message to perform return routability (RR) authentication;
• and
• e) at the HA, notifying the authentication result of the second MR to the first MR when receiving a RR authentication result message including the prefix of the first MR to be registered as a peer from the second MR, where the RR authentication result message is a peer mobile router registering request response message.

A computer readable recording medium storing a program for executing a failover method for failure of a second mobile router (MR) when a CoA of a first MR that is a peer MR is registered to a home agent (HA) of the second MR by a method for registering multiple CoAs, comprising the functions of:

• a) transmitting a proxy binding update message from the first MR to a HA of the second MR when the second MR notices the first MR with the failure of the second MR, information of a current failed primary CoA is updated in a binding cache of the HA;
• b) at the first MR, notifying the second MR that the first MR functions as a proxy and creating a tunnel to the HA;
• c) providing a service through the created tunnel;
• d) at the second MR, notifying that the MR2 is recovered from the failure to the HA through a binding update message when the second MR is recovered from the failure, and at the HA, notifying the first MR, which is set as a backup among backup CoAs in a binding cache, that the second MR is recovered through a recovery notify message;
• and
• e) deleting a tunnel formed between the first MR and the HA and updating the binding cache of the HA.

A computer readable recording medium storing a program for executing a recovery method for recovering a second mobile router (MR) from failure when a CoA of a first MR that is a peer to the second MR is registered at a home agent (HA) of the second mobile router by a method of registering multiple CoAs, comprising the functions of:

• a) updating information about a current failed primary CoA to a binding cache of the home agent HA by transmitting a proxy binding update message to a HA of the second MR from the first MR capable of providing a proxy service if a “ICMP host unreachable” message is returned from the second MR after transmitting a message for a non-exist port to a CoA of the second MR when a RA message is not received from the second;
• b) at the first MR, forming a tunnel between the first MR to the HA of the second MR;
• c) providing a service through the formed tunnel;
• d) at the second MR, notifying the HA through a binding update message that the second MR is recovered from a failure when the second MR is recovered, and, at the HA, notifying the first MR, which is set as backup among backup CoAs in a binding cache, through a recovery notify message that the second MR is recovered from the failure;
• and
• e) deleting the formed tunnel between the first MR and the HA, and updating the binding cache of the HA.