read 'A Comparison of Mechanisms for Improving TCP Performance over Wireless Links' (1997)
the techniques are divided in 3 types:
1. Link-layer mod
2. Split-connection protocols -> (eg. snoop)no
3. End to end
We will focus only on #3
SACK
SMART -> improved SACK
ELN (explicit loss notification) -> flag on TCP. used for knowing type of error.
ELN with retransmit on first dupack
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