Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt>

Martin Rex <mrex@sap.com> Wed, 27 July 2011 23:51 UTC

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From: Martin Rex <mrex@sap.com>
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To: marka@isc.org (Mark Andrews)
Date: Thu, 28 Jul 2011 01:50:39 +0200 (MEST)
In-Reply-To: <20110727230938.B787612383D5@drugs.dv.isc.org> from "Mark Andrews" at Jul 28, 11 09:09:38 am
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Cc: hybi@ietf.org, ietf@ietf.org
Subject: Re: [hybi] Last Call: <draft-ietf-hybi-thewebsocketprotocol-10.txt>
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Mark Andrews wrote:
> 
> Dave Cridland writes:
> > 
> > Happy eyeballs - try everything as soon as you can, in parallel. Drop  
> > everything else when one does.
> 
> More correctly it is try the first address and if that doesn't
> connect in a short period (150...250ms) start a second connection
> to the next address while continuing with the first.  If you have
> more that 2 address you do something similar for the next one (I
> use 1/2 the original timeout, but that is a implementation detail).
> You continue to use the address that works for that session.  You
> drop any other connections to other addresses that complete.

Happy eyeballs means that a clients reaction to congestion is
to perform an DoS attack, flood the network with additional
connection requests and hammer the server with many additional
half-open connections that will never actually get used.

While this might currently "improve" the end user experience
of clients, it simultaneously adds a deterrant to server operators
to announce IPv6 addresses (even multiple IP addresses -- they're
better of with IPv4 NAT if they have multiple servers at a single
location).

-Martin