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CCS
2005
ACM

Misbehaving TCP receivers can cause internet-wide congestion collapse

14 years 20 days ago
Misbehaving TCP receivers can cause internet-wide congestion collapse
An optimistic acknowledgment (opt-ack) is an acknowledgment sent by a misbehaving client for a data segment that it has not received. Whereas previous work has focused on opt-ack as a means to greedily improve end-toend performance, we study opt-ack exclusively as a denial of service attack. Specifically, an attacker sends optimistic acknowledgments to many victims in parallel, thereby amplifying its effective bandwidth by a factor of 30 million (worst case). Thus, even a relatively modest attacker can totally saturate the paths from many victims back to the attacker. Worse, a distributed network of compromised machines (“zombies”) can exploit this attack in parallel to bring about wide-spread, sustained congestion collapse. We implement this attack both in simulation and in a wide-area network, and show it severity both in terms of number of packets and total traffic generated. We engineer and implement a novel solution that does not require client or network modifications all...
Rob Sherwood, Bobby Bhattacharjee, Ryan Braud
Added 26 Jun 2010
Updated 26 Jun 2010
Type Conference
Year 2005
Where CCS
Authors Rob Sherwood, Bobby Bhattacharjee, Ryan Braud
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