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Re: unmanaged scope comments





--On 20. september 2002 00:48 +0900 Jun-ichiro itojun Hagino <itojun@iijlab.net> wrote:

==> connectivity includes one very important component IMO: the quality
of network connections.  This is often ignored.  It's a high risk for a
vendor to enable IPv6 by default, for example, if that'd result in lower
quality connections to e.g. dual-stack web servers (a very real fact in
6bone), this should be taken into consideration at least in the short
term.
	i don't understand what you want to do about it.  will you ping/ping6
	destination and pick shorter roundtrip?  when multiple A records
	are returned for www.foo.com, do you probe them to get the optimal
	performance?  i believe the "quality" factor does not matter, and
	it cannot be measured from endpoint (at least within short time).

I have wanted for a long time someone more competent than me to run an experiment where one, after a name lookup, would send SYN packets to *all* the addresses returned, and only complete the three-way handshake on the first one to reply.

after all, it seems impossible to get anyone to take seriously the job of getting the network to tell me which of two addresses are "best", and the servers in these DOS-attack days have to defend against synfloods anyway.

just wasting some SYN packets seems to me to be likely to achieve the "low hanging fruit" of *most of the time* picking the best address to use.

so far, afaik, nobodoy's tried it.

Harald