Decongestion Control Offense by James Gross Amit Mondal
Basic Idea “Approximate fairness through differential droppings” [Pan et al. 03] –Per-flow? Sending rate is not sensitive to packet losses Packet losses are compensated by coding
Design Problem Assumption –Bottlenecks are always at the edge Access link –Neglect the case of multiple bottlenecks Leads to network working in reduced efficiency because of “dead packets” consuming network resources
Contd… Interaction with Overlay routing, Traffic Engineering etc? Overhead of coding? –Packet duplication! –Isn’t it simply waste of network resources? How about Control Packets in the network like SYN/ FIN/RST etc?
Contd… Network is always congested. How do you diagnose the network? –Traceroute, Ping? DNS over UDP? How about BGP Sessions? –BGP is erratic in presence of congestion
Contd… Misconfiguration at access router compromises global fairness
Deployment Issue Compatibility/Interaction with other congestion protocols like TCP, UDP etc. Incremental deployability? Both end-users and network switches need to be modified! Huge deployment overhead!