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Re: Multi-6 [WAS: OT - Vint Cerf joins Google]

  • From: John Payne
  • Date: Tue Sep 13 16:33:21 2005


On Sep 13, 2005, at 3:19 PM, Iljitsch van Beijnum wrote:

On 13-sep-2005, at 0:22, Igor Gashinsky wrote:

:: I must be missing something, but there's a good chance that the requester is
:: going to have to wait for a timeout on their SYN packets before failing over
:: to another address to try. Or is the requester supposed to send SYNs to all
:: addresses for a hostname and race them off?
This aspect isn't nailed down yet, but basically there are two options: depend on the application do try all addresses (which apps should do anyway, but I for one wouldn't want to wait for all these timeouts), or have the shim detect that the first address doesn't work and repair the failure. This adds additional complexity, though, and there is still a timeout, although it isn't a full TCP SYN timeout.
So, move to IPv6 and watch your initial connect times according to keynote et al. increase?


Or, on top of that, how traffic engineering can be performed with shim6..
For outgoing traffic there is no difference with the current situation (as long as there are nog ingress filtering issues). For incoming traffic, it basically starts with DNS load balancing, and the shim itself will have priority mechanisms to choose between different address pairs but this will generally not come into play because the idea is that the shim doesn't do anything unless there is an outage.
Mmmm, DNS load balancing. As a shareholder in my current employer, I am happy to see that market increase. As a network engineer, I keep getting the feeling I'm missing out on some great drugs.


So where were you the past years in multi6 and months in shim6? Please be part of the solution and not part of the problem. (That goes for John Payne and Daniel Senie too.)
I was in denial that multihoming would get this broken. I've joined the mailing list... I'll note that the mailing list archive is not linked anywhere useful, so to save others the guesswork: <http://psg.com/lists/shim6/>





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