This isolation, however, comes at a cost, because the traditional
communication abstraction maintained by these new network-layer extensions
hides information that transport-layer protocols should act on.
The information is hidden only for the purposes of connection management,
not for parameter estimation.
Many common
transport mechanisms, such as congestion window estimation, RTT measurements
or path MTU discovery, are not agile enough to properly handle the significant
instantaneous changes to path characteristics that these network-layer
extensions introduce.
I might say that "Many current transport algorithms for...", so that it
is not implied that there are no algorithms that would work.
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