P2P Package Manager

[Billy Crook]

Has anyone ever heard of a package manager that 'scans' other machines
within its subnet or within specified subnets for updates before using the
official repositories?  There would either have to be some service
advertisement protocol lime MDNS or each machine would literally have to
scan for a designated port number listening for these requests on all
machines.  Once they locate each other, the idea would be ome machine
downloads 500MB of updates from the repo, and from there on, every other
machine (with the same distro and arch) just pulls from the faster local
machine, rather than using up inet bandwidth.

Any suggestions (Other than a dedicated local repository mirror)?
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