Abstract: An approach for detecting unplanned changes in the link performance of a delay tolerant network and making automatic and immediate adjustments to the contact plans of the network to provide route revisions that will reallocate traffic load to improve network performance. Physical layer information is used to predict link performance and to adapt route computation to avoid disruption and to optimize contact performance. Prediction is based on advanced software defined radio observable phenomena such as signal to noise ratio, background noise measurements, and forward error correction bit error counts. This approach can enable a delay-tolerant network node to recompute routes and revise bundle forwarding decisions automatically in response to changes in the properties of the communication link.