A system to preserve Very Small Aperture Terminal, VSAT, network information addressing over a space link, the system comprising: a plurality of Very Small Aperture Terminals, VSATs,, each VSAT comprising: a network interface over which the VSAT communicates with networks which are linked to the network interface; a space link interface over which the VSAT communicates with a selected satellite hub, and a configuration table comprising information of networks local to the VSAT and a satellite hub table, wherein the information of networks local to the VSAT comprises subnet and range information for the networks linked to the network interface, and a VSAT registration module configured to select a first satellite hub from the satellite hub table for communicating with using the space link interface, and register the VSAT with the first selected hub, and using an advertise networks module advertise the information of networks local to the VSAT, by communicating a route based on the information of networks local to the VSAT, to the first selected hub; and a plurality of satellite hubs, each satellite hub comprising: a registration module configured to register each VSAT, and an advertise networks module configured to advertise the information of networks local to each VSAT from the respective VSAT, wherein the information of networks local to each VSAT is independent of the satellite hub selected from the satellite hub table; and wherein, for each VSAT, when communications between the VSAT and the first selected hub is subject to a switchover then the VSAT registration module is further configured to select a second satellite hub from the satellite hub table for communicating with using the space link interface, register the VSAT with the second selected hub, and advertise the information of networks local to the VSAT using the advertise networks module by communicating a route based on the information of networks local to the VSAT to the second selected hub. a plurality of Very Small Aperture Terminals, VSATs,, each VSAT comprising: a network interface over which the VSAT communicates with networks which are linked to the network interface; a space link interface over which the VSAT communicates with a selected satellite hub, and a configuration table comprising information of networks local to the VSAT and a satellite hub table, wherein the information of networks local to the VSAT comprises subnet and range information for the networks linked to the network interface, and a VSAT registration module configured to select a first satellite hub from the satellite hub table for communicating with using the space link interface, and register the VSAT with the first selected hub, and using an advertise networks module advertise the information of networks local to the VSAT, by communicating a route based on the information of networks local to the VSAT, to the first selected hub; and a network interface over which the VSAT communicates with networks which are linked to the network interface; a space link interface over which the VSAT communicates with a selected satellite hub, and a configuration table comprising information of networks local to the VSAT and a satellite hub table, wherein the information of networks local to the VSAT comprises subnet and range information for the networks linked to the network interface, and a VSAT registration module configured to select a first satellite hub from the satellite hub table for communicating with using the space link interface, and register the VSAT with the first selected hub, and using an advertise networks module advertise the information of networks local to the VSAT, by communicating a route based on the information of networks local to the VSAT, to the first selected hub; and a plurality of satellite hubs, each satellite hub comprising: a registration module configured to register each VSAT, and an advertise networks module configured to advertise the information of networks local to each VSAT from the respective VSAT, a registration module configured to register each VSAT, and an advertise networks module configured to advertise the information of networks local to each VSAT from the respective VSAT, wherein the information of networks local to each VSAT is independent of the satellite hub selected from the satellite hub table; and wherein, for each VSAT, when communications between the VSAT and the first selected hub is subject to a switchover then the VSAT registration module is further configured to select a second satellite hub from the satellite hub table for communicating with using the space link interface, register the VSAT with the second selected hub, and advertise the information of networks local to the VSAT using the advertise networks module by communicating a route based on the information of networks local to the VSAT to the second selected hub.