Comment: Ricochet did this post-9/11, routing worked fine. (Score 3, Interesting) 45
While much of Manhattan's traditional communications infrastructure was literally a smoking crater after 9/11, the Ricochet mesh network was alive and well, built to barely notice the loss of individual nodes.
The company had recently gone bankrupt, but all the hardware was still in place, so some ex-employees drove from Denver to NYC with a bunch of modems and laptops, to bring mobile connectivity to the recovery effort.
Mesh works in this case because MCDN uses geographic routing -- the packet header literally contains a packed lat/long for the destination, and nodes make their routing decisions by angle and distance. There's a layer of name-to-geo resolution which makes that all work, and in the Ricochet days it was centralized, but I believe it could be made to operate with DHT like torrent networks do now.