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Assorted Rants Tagged ‘IP’, page 1:

TCP Peculiarities for Games, part 1

posted by

Quote: “the best we can hope when using a single TCP connection over 5%-loss channel – is having 1.5-second “lag spike” every 5 or so minutes, and a 3-second “lag spike” every 2 hours.”
Another Quote: “we may already have the-information-we-need on the receiving host – but this information is hidden from us by layers of abstraction on receiving side”
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Packet Loss for an App-Level Developer. Part II. Last Mile, Wi-Fi, and Summary

posted by

Quote: “Burstable packet loss. May be caused by a neighbor preparing his breakfast”
Another Quote: “if there is a NAT device on the way from your Client to your Server – a sudden IP change can occur with absolutely no notification to Client whatsoever.”
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Packet Loss for an App-Level Developer. Part I. Router Failures, BGP Convergence Time, AQM, Traffic Shapers.

posted by

Quote: “All the routers, switches (actually – pretty much each and every device which forms Internet infrastructure) – are allowed to drop each and every packet.”
Another Quote: “TCP, when it observes a dropped packet, interprets it as an indication of congestion – and slows down.”
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UDP from MOG Perspective

posted by

Quote: “you may think of UDP as of an analog of good old C: you can do pretty much everything, but it is not because the language helps you – it is rather because it doesn’t stand in the way :-)”
Another Quote: “As most of the routers (including pretty much every backbone router out there) are not configured to support multicast, it makes multicast over the public Internet hopeless :-(“
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Part V: UDP of 64 Network DO’s and DON’Ts for Game Engines

posted by

Quote: “In general, lag and jitter are not specific to UDP, and manifest themselves for absolutely any Internet connection.”
Another Quote: “If you need a globally-reachable server with single-digit-ms lag for all the players, it is simply not possible”
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