The TCP SACK-aware snoop protocol for TCP over wireless networks

Vangala, Sarma; Labrador, Miguel A.

doi:10.1109/vetecf.2003.1286032

Cited by 22 publications

(19 citation statements)

References 16 publications

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“…1) Snoop Results: Snoop proxies increase performance in standard 802.11 networks, however, both our study and numerous other recent studies [14], [12], [13] have suggested that Snoop cannot completely hide losses from TCP senders. Our results, Fig 6 and Fig 7, suggest that Snoop is not suitable as a performance enhancement with NoAck 802.11.…”

Section: Fig 6 Andmentioning

confidence: 52%

“…One problem, discussed later in more detail, is that I-TCP breaks TCP end-to-end semantics. The Snoop proxy idea [10], [7], [11], [12], [13], [14], first envisaged by Balakrishnan [10], was that an intermediate device could cache packets and retransmit them upon reception of TCP dup acks. While TCP ack numbers are increasing, Snoop assumes that the transfer is in good state.…”

Section: A I-tcpmentioning

confidence: 99%

“…Firstly, the TCP congestion window is still end-to-end and therefore must grow larger than I-TCP where window sizes are insignificant given a small enough RTT on the unreliable side. Thus Snoop proxies are dependent on their ability to hide link losses from the sender, however, there are a number of studies that suggest issues with SACK and Snoop [14], [12], [13]. These studies suggest that Snoop is unable to completely hide losses from the TCP receiver, especially in the presence of burst losses.…”

Section: A I-tcpmentioning

confidence: 99%

See 2 more Smart Citations

Solving Ack inefficiencies in 802.11 networks

Murray

Koziniec

Dixon

2009

2009 IEEE International Conference on Internet Multimedia Services Architecture and Applications (IMSAA)

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Abstract-The founding idea behind this study was that 802.11 acks and TCP acks are substantial contributors to 802.11 overheads, yet, they both provide the same functionality; reliability. Initial experiments suggest that 802.11 acks contribute to over 20% of the overhead in 802.11 networks. Unfortunately, without 802.11 acks, paths with RTTs greater than a millisecond are unable to utilise this additional performance because lost packets, which occur frequently in unacknowledged (NoAck) 802.11, are interpreted as congestion. This study experiments with a range of PEPs (Performance Enhancing Proxies) which retransmit lost packets. A new proxy, known as D-Proxy, designed to solve the shortcomings of previous I-TCP and Snoop proxies, is experimentally developed and tested in Linux. D-Proxy is a distributed, proactive proxy that caches, analyses and resends packets based on TCP sequence numbers. The results suggest that D-Proxy can substantially improve 802.11 throughputs.

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Section: Fig 6 Andmentioning

confidence: 52%

Section: A I-tcpmentioning

confidence: 99%

Section: A I-tcpmentioning

confidence: 99%

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Solving Ack inefficiencies in 802.11 networks

Murray

Koziniec

Dixon

2009

2009 IEEE International Conference on Internet Multimedia Services Architecture and Applications (IMSAA)

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“…When this option is active, a process is executed to create and keep track of active connections transiting the specific node (variable n f ). The W ngwa value is then calculated by Equation (3), where B r is the total space available in the queue of the router. The factor 0.98 is used to provide space in the queue for acknowledgments (ACK).…”

Section: Division By Number Of Flows Optionmentioning

confidence: 99%

Available Network Bandwidth Schema to Improve Performance in TCP Protocols

Talau¹,

Wille²

2013

IJCNC

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“…It also fails to specify how many duplicate acks should be filtered before resending the lost TCP segment. Furthermore, a number of studies suggest that Snoop is unable to completely hide TCP losses due to interoperability problems between SACK and Snoop [16], [17], [18].…”

Section: B Snoopmentioning

confidence: 99%

D-Proxy: Reliability in wireless networks

Murray

Koziniec

Dixon

2010

2010 16th Asia-Pacific Conference on Communications (APCC)

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Abstract-Packet corruption negatively affects TCP throughputs because losses are interpreted as congestion. To enable TCP to operate effectively over wireless networks, a number of reliability techniques such as Forward Error Correction (FEC) and Automatic Repeat Request (ARQ) are used. These provide reliability at the expense of increased overheads. This study provides experimental results of a new distributed Performance Enhancing Proxy (PEP) called D-Proxy. This proxy can provide reliability to wireless links with minimal overhead. The results show that D-Proxy can provide near-optimal performance in the presence of high loss rates. It is suggested that D-Proxy could be used to replace current ARQ mechanisms.

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The TCP SACK-aware snoop protocol for TCP over wireless networks

Cited by 22 publications

References 16 publications

Solving Ack inefficiencies in 802.11 networks

Solving Ack inefficiencies in 802.11 networks

Available Network Bandwidth Schema to Improve Performance in TCP Protocols

D-Proxy: Reliability in wireless networks

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