Congestion control mobility PathA Foreign Agent 192.168.1.254 Mobile Node A Home Address 10.1.1.1 Visited Network A CCoA192168.120 192.168.1.024 Correspondent Node 2a2级☒ Internet Local Network B Mobile Node A Home Address 10.1.1.1 Visited Network B CoA192.168.2.20 192.1682.0/24 Path BCongestion control & mobility