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Summary To provide a connection between low earth orbit (LEO) satellite network and terrestrial Internet, a geographical addressing strategy for LEO network is proposed in this paper. When the IP geo‐subnet is divided based on location, the terrestrial users inside and satellite routers above each subnet could be allocated and maintain IP addresses under the regulation of IP network. The addressing strategy is implemented in the first hop and last hop of packet transmission. This paper proves that the application of geo‐subnets could effectively reduce the route table size and generation time in large‐scale space‐ground integrated network as well as maintain the stability of route table when the user condition alters. The performance loss of abnormal addressing caused by the change of satellite coverage would decrease with the reduction of geo‐subnet area. However, the decrease rate would decline during the subnet subdivision and therefore has limited optimization for abnormal addressing. The routing broadcast strategy proposed in this paper could effectively reduce the system packet loss brought by abnormal user at the same geo‐subnet division. Simulation confirms that the geographical addressing strategy combined with routing broadcast optimization in this paper could achieve more than 90% network throughput while reducing 76% of the routing cost.

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