User-space Multipath UDP in Mosh
Résumé
In many network topologies, hosts have multiple IP addresses, and may
choose among multiple network paths by selecting the source and
destination addresses of the packets that they send. This can happen with
multihomed hosts (hosts connected to multiple networks), or in multihomed
networks using source-specific routing. A number of
efforts have been made to dynamically choose between multiple addresses in
order to improve the reliability or the performance of network
applications, at the network layer, as in Shim6, or
at the transport layer, as in MPTCP. In this paper, we
describe our experience of implementing dynamic address selection at the
application layer within the Mobile Shell. While our work is specific to Mosh, we hope that
it is generic enough to serve as a basis for designing UDP-based multipath
applications or even more general APIs.
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