In message
<201107290238(_dot_)p6T2cCLu021118(_at_)fs4113(_dot_)wdf(_dot_)sap(_dot_)corp>,
Martin Rex writes
:
Mark Andrews wrote:
Martin Rex writes:
Mark Andrews wrote:
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
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.
It is not a DoS attack. The client is almost certainly going to
make those connection attempts anyway if the path is congested
enough to cause the first connection attempt to fail. The only
difference is the application gives up in 30 seconds rather than
60 or 90 seconds by doing the attempts serially.
150...250ms ?!
Yes, that small. For most people, most connections are "in country"
or "in continent" however there are always exceptions to this.
The times are driven by human delay tolerances.
For a satellite link you already have started 3 parallel connects
in non-congested(!) situations.
Indeed. However only one will have data sent over it. The three
way handshake won't even complete for two of them in many cases.
For those that do complete the server won't be woken up in many
cases as no data gets sent.
just some random IPv4 pings from my office (in germany)
_without_congestion_:
ping www.asus.com.tw 300-380ms
ping south-america.pool.ntp.org 280-370ms
ping oceania.pool.ntp.org 340-420ms
ping www.eff.org 160-170ms
ping www.ietf79.cn 330-450ms
ping www.ietf76.jp 270-370ms
So your approach is already hurting the network without congestion!
Only if you think a could of extra TCP connection attemps to servers
on the other side of the world is hurting the network.
B.T.W. I'm well aware of speed of light issues. Look at my signature.
Mark
--
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: marka(_at_)isc(_dot_)org
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