Dynamic Home Agent Discovery
Mobile IPv6 supports a Dynamic Home Agent Address Discovery mechanism that allows a mobile node to dynamically obtain its home agents address .
This is necessary when the mobile node does not know its home agent or the mobile nodes current home agent is shut down or the home network is reconfigured.
If a mobile node cannot obtain its home agents address using the Home Agent Discovery mechanism, it can execute the Dynamic Home Agent
Fig. 3. Basic operation of the Dynamic Home Agent Discovery.
Address Discovery mechanism as described below to obtain its home agents address, as shown in Fig. 3:
1. The mobile node sends a Dynamic Home Agent Address Discovery request message to the ‘‘Home-Agents anycast address’’ for its own home subnet prefix.
2. The home agent on the home link returns a BA with a reject status but includes a HA List.
3. The mobile node sends a BU to one of the home agents listed in the HA List and waits for the matching BA.
2. The home agent on the home link returns a BA with a reject status but includes a HA List.
3. The mobile node sends a BU to one of the home agents listed in the HA List and waits for the matching BA.
출처 : A survey of Mobile IP in cellular and Mobile Ad-Hoc Network environments
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