Re: [tcpm] [v6ops] Flow Label Load Balancing
Fernando Gont <fgont@si6networks.com> Fri, 04 December 2020 23:35 UTC
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To: Tom Herbert <tom@herbertland.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Erik Kline <ek.ietf@gmail.com>, IPv6 Operations <v6ops@ietf.org>, tcpm <tcpm@ietf.org>, Fernando Gont <fernando@gont.com.ar>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Thu, 03 Dec 2020 19:41:33 -0300
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Subject: Re: [tcpm] [v6ops] Flow Label Load Balancing
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Tom, On 3/12/20 17:38, Tom Herbert wrote: > On Thu, Dec 3, 2020 at 1:17 PM Brian E Carpenter > <brian.e.carpenter@gmail.com> wrote: >> >> On 04-Dec-20 06:30, Tom Herbert wrote: >>> On Thu, Dec 3, 2020 at 8:43 AM Erik Kline <ek.ietf@gmail.com> wrote: [....] >> >> But that doesn't help with server load balancing. For ECMP/LAG in a >> transit network, the DA alone doesn't help either, if a particular >> destination is prone to very heavy flows for some reason. > > Brian, > > Specifically, that is a problem for a host that uses a _single_ IPv6 > address for all its connections. That that's the vast majority of current hosts - if not all. > What I am suggesting is to give hosts > many addresses, which we already do anyway like when mobile devices > and data center servers are assigned /64s. If a host then randomly > chooses an address from that block for each connection it creates > thenl the address 2-tuple contains all the entropy needed for purposes > of load balancing, ECMP, etc. is contained in the source address. > Addresses are guaranteed to be present and plaintext in each packet so > no DPI required, they're as stable as any flow identifying information > in a packet can be and they offer much more entropy than sixteen bits > of port number of twenty bit flow label. Agreed. Although that move is not-trivial: e.g. if you move from shared link to /64 per hosts, then stuff like mDNS breaks. There's also an API to be specifiied. P.S.: And, in the process, we have kind of burned 64-bits of the 128-bit IPv6 addresses, too... Thanks, -- Fernando Gont SI6 Networks e-mail: fgont@si6networks.com PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492
- [tcpm] Flow Label Load Balancing Alexander Azimov
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Alexander Azimov
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Alexander Azimov
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Brian E Carpenter
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Joel M. Halpern
- Re: [tcpm] [v6ops] Flow Label Load Balancing Brian E Carpenter
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Joel M. Halpern
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Brian E Carpenter
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Alexander Azimov
- Re: [tcpm] [v6ops] Flow Label Load Balancing Yuchung Cheng
- Re: [tcpm] [v6ops] Flow Label Load Balancing Brian E Carpenter
- Re: [tcpm] [v6ops] Flow Label Load Balancing Alexander Azimov
- Re: [tcpm] [v6ops] Flow Label Load Balancing Brian E Carpenter
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Mark Smith
- Re: [tcpm] [v6ops] Flow Label Load Balancing Joseph Touch
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Mark Smith
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Alexander Azimov
- Re: [tcpm] [v6ops] Flow Label Load Balancing Michael Tuexen
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Erik Kline
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Brian E Carpenter
- Re: [tcpm] [v6ops] Flow Label Load Balancing Tom Herbert
- Re: [tcpm] [v6ops] Flow Label Load Balancing Fernando Gont