| 摘要 |
A method of enabling roaming of a mobile internet-access host (9) from a local area network (3) to a GSM network (6), each network having a home agent (HA) for routing internet datagrams between networks. The method comprises deregistering the mobile terminal (9) from said local area network (3) and registering it with the GSM network (6) and allocating to the mobile host (9) a new internet address in the GSM network (6). An internet security key is sent via the GSM Short Message Service from the local area network's home agent (HA) to the mobile terminal (9). The new internet address is transmitted, together with authentication data generated using the security key, via the internet (5) to the local area network's home agent (HA) which registers that address as a care-of-address for the mobile host (9).
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