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DTN challenges… Intermittent/Scheduled/Opportunistic Links Scheduled transfers can save power and help congestion; scheduling common for esoteric links Interrupted Links RF noise, light or acoustic interference, LPI/LPD concerns Frequent disconnection among mobile nodes due to terrain/fading Very Large Delays Natural prop delay could be seconds to minutes If disconnected, may be (effectively) much longer Different Network Architectures Many specialized networks won’t/can’t ever run IP |