Thomas Kunz
Systems and Computer Engineering
26
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?