Method and apparatus for providing mobility to a mobile node

A first access point for providing access to a communications system to mobile nodes capable of packet based communication with other nodes in the communications system, the first access point comprising:

• a signed session information package handler connected to an interface and being configured to:
• generate a signed session information package comprising a signature of the first access point and routing information relating to a communications session for which the first access point should act as an anchor point;
• and
• send, via the interface, the signed session information package to a mobile node being party to the communications session to which the signed session information package relates;
• and
• a forwarding state handler configured to:
• store the routing information relating to the communications session;
• receive from a further access point, a forwarding request message requesting the first access point to forward to the further access point any datagrams sent from a corresponding node to the mobile node;
• and
• establish a tunnel to the further access point for forwarding datagrams relating to the communication session;
• wherein the first access point is configured to route datagrams relating to the communications session in accordance with the stored routing information, and
• wherein the forwarding state handler is further configured to tear down the tunnel to the further access point and establish a second tunnel to a second further access point upon receiving a second forwarding request message from the second further access point and verifying a signature of the second further access point contained in the second forwarding request message.