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Re: Extending shim6 to use multiple locator pairs simultaneously
In terms of thinking about this, it might make sense to start with
SCTP, since SCTP already supports tracking congestion information
for each path. Then you can ask yourself what would be needed if
both paths were used as the same time. Once we know what to do,
then applying it to TCP would be conceptually simple (even though
it might be hard in practice.)
Note that SCTP only uses one path at a time, and only switches
after detecting a failure. So AFAIK the SCTP folks didn't explore
what would happen is both paths are used concurrently.
The SCTP RFC doesn't support concurrent multiple path, but there are
not a single researches in this area. CMT-SCTP proposed by PET in
Univ. of Delaware is one of those researches and looks successful.
As Eric suggests, it seems to me not a good idea to use multiple
paths concurrently without any modifications to transport protocols.
CMT-SCTP is just those modifications to SCTP.