This invention relates to MIPv6 and HMIPv6. Specifically, it is related to the configuration of valid on-link prefixes at MAPs in HMIPv6. It is also related to DHCPv6. The invention explains a method for providing automatic configuration of prefixes at all MAPs in a communication system comprising Mobility Anchor Point (MAP) Domains and within each MAP Domain, a Leader MAP, a DHCPV6 Server and possibly other MAP(s), the said method, comprising the steps of: Configuring the anycast address of Leader MAP for that MAP Domain; Configuring the list of valid on-link prefixes of border ARs for that MAP Domain; Configuring the anycast addresses of Leader MAPs in neighboring MAP Domains; Processing a request for MAP Domain Info option and sending a reply with MAP Domain Info option; at DHCPV6 Server. At Leader MAPs the said method involves requesting MAP Domain Info option from DHCPV6 server; assigning itself anycast address obtained through DHCPV6; sending the list of valid on-link prefixes to Leader MAPs in all neighboring MAP domains; and multicasting the prefix list, obtained through DHCPV6 or from other Leader MAPs, to all other MAPs within the domain. At other MAPs the said method involves joining the well-known multicast address for its MAP Domain; and receiving prefix lists from their Leader MAP and storing them.
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