Messages in this thread | | | Date | Fri, 17 Sep 1999 09:05:26 +0000 | From | Steve Underwood <> | Subject | Re: > 15K simultaneous connections EXAMPLE program/OS config needed, was: Re: POSIX aio vs completion ports |
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Rogier Wolff wrote:
> [...]
> If you're handling lots of outgoing connections (unlikely), you might > run into trouble. Suppose we want ephemeral (sp?) ports, the kernel > might say "Sorry, none found" when you've used all of them. This is > incorrect (but nobody has run into it yet). After one round around the > port space searching for an unused port, the kernel should just > allocate a port that's already used. Then you can connect to any > IP/port, except the one that the existing connection is already > connected to. If the kernel knows the destination IP/port at that > time, it should try to avoid that situation. Otherwise, it should just > hope for the best.
I'm not sure what you are saying here. I've never hit the limit, even during flood testing stuff, so I don't know what actually happens. Are you implying that other Unixen reallocate an already used port, without the use of SO_REUSEADDR, or that you think they should? I had always assumed, but never explicitly read, that without SO_REUSEADDR there would never be reuse of the local port.
One PITA with port allocation is that you can't reserve the darned things. You are running a server. It dies. You try to restart it, and find some client type program has just been allocated your port. Ugh!
Steve
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