Thomas Kunz
Systems and Computer Engineering
412
Snoop: Evaluation
nmost effort spent on
direction FH->MH
–authors argue that not much can be done for
MH->FH
nlosses occur over
first link, the unreliable wireless link
nInternet drops 2%-5%
of IP packets, tendency rising
–assume that IP packet is lost in wired part of
network:
nreceiver (FH) will
issue duplicate ACKs
nthis should trigger
fast retransmit rather than slow start (?)
nnothing is done to
ensure that ACKs are not dropped over last link
nretransmission of
data packet over wireless link is subject to unreliable link and low bandwidth again
–Snoop could potentially benefit from caching
packets in both directions
nhow would this
differ from link-layer retransmission policy?