As far as I remember SACK will only retransmit the packets that were lost
- that is the whole idea of Selective Acknowledgements - it is there to
reduce the number of retransmissions.
SACK and Fast Retransmit are meant to coexist.
On Tue, 28 Mar 2000, Ramakrishnan wrote:
>
> Hi All,
> I am sorry if this is kinda newbie question.
>
> I am implementing the RFC 2001 and I want to know whether SACK and Fast
> Retransmit can coexist. Reading the RFCs has only landed me up in
> confusion. While fast retransmit will send the packet when it sees the
> third duplicate ACK, SACK will retransmit the all the packets after a
> retransmission timeout. If my fast retransmit packet is not ACKed
> before the retransmission timer times out, the same packet gets sent
> two times. That is my problem.
>
> Any help is greatly appreciated.
> Thanks for the patience.
> ramki
>
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Sandeep Agarwal
Electrical & Computer Engineering DearBorn Hall 208
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