Fred Baker wrote:
On Nov 18, 2009, at 6:22 PM, Arifumi Matsumoto wrote:
I guess that is because if you force to try all the pairs, it perfectly
ignores the address selection manner defined in RFC 3484, and thus,
it gives us not little impact.
If they space them closely and run them in parallel, I guess I don't see
the impact. Imagine you have five addresses and your peer has five
addresses, so there are 25 pairs. Imagine you are spacing the SYNs 10 ms
apart. Imagine that the only pair that works is the last one you try.
I'm a bit worried about this. If e.g. the host is 100ms (RTT) away and
10 combinations work, you may end up creating TCP state (and getting
syn-acks back) on the destination host for 10 connections, while you are
only going to use one.
I feel the delay between then should ideally be a bit longer than the
RTT. Which is fine if you only try a few combinations. Of course one
problem is that you don't really know what the RTT will be.
Stig
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