jaminus
join:2004-10-14
Arlington, VA
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Re: ISPs can't win!
What's wrong with delaying non time-sensitive packets so time-sensitive packets can get to the next hop on a a timely basis during times of network congestion? Most people, myself included, aren't likely to notice an extra 100ms on an HTTP session. But that sort of jitter can severely degrade VoIP or online gaming. Inspecting each packet and classifying it by application type is one method ISPs can use to configure their systems to reduce the likelihood that time sensitive packets will suffer on account of network congestion. Application layer QoS really does make a lot of sense, even if existing standards don't spell out the details of a DPI-based traffic prioritization regime on the ISP level. |
funchords
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join:2001-03-11
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1 edit | said by jaminus  :What's wrong with delaying non time-sensitive packets so time-sensitive packets can get to the next hop on a a timely basis during times of network congestion? Nothing.
said by jaminus :Inspecting each packet and classifying it by application type is one method ISPs can use to configure their systems to reduce the likelihood that time sensitive packets will suffer on account of network congestion. Except they can't always know whether a use is real-time or not. Identical algorithms in BitTorrent not only supports background file transfers, but it also supports real-time streaming. DPI equipment can only guess as to what it is.
said by jaminus : Application layer QoS really does make a lot of sense, even if existing standards don't spell out the details of a DPI-based traffic prioritization regime on the ISP level. It seems to be "the new black" but none of these many network vendor companies have made their case to the satisfaction of the IETF.
That said, I'm not against it myself -- but until it's Internet Standard, it needs to be done on an opt-in basis.
Secondly, it can't be an alternative to growing your network capacity as fast as you normally ought to -- and that's really what's behind this. For every dollar spent on DPI, ISPs are told that they'll save $10 on network upgrades. Now don't step in the marketing, but if that's even partially true, it's a Pandora's box leading to death by congestion.
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Robb Topolski -= funchords.com =- Hillsboro, Oregon
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