Date: Sun, 6 Feb 2005 08:53:22 +1100 From: Peter Yandell <Peter.Yandell@IntelliGuardit.net> To: freebsd-questions@freebsd.org Subject: Network tuning and port allocation Message-ID: <8d71c201fefc4e97005450cbb133671e@IntelliGuardit.net>
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Is there a simple way to check the proportion of available TCP ports currently in use for a particular address on a particular interface? I'm testing some networking gear, and am using a few tools to generate large amounts of network traffic. One of the tuning issues in doing this is ensuring that enough TCP port numbers are available to support all the connections I want to make. For most network tuning issues, there's a way to make a measurement and a way to make an adjustment. For example, I can check the mbuf usage using "netstat -m" and adjust my nmbclusters accordingly. For TCP port usage I can make the adjustment through net.inet.ip.portrange.*, or by assigning more addresses to an interface and distributing traffic across them, but how do I measure the problem in the first place? At the moment, if I haven't got enough ports available, I usually discover it by noticing a slowdown in traffic and then eliminating all the other potential problems, or by just allocating more ports and seeing if it makes a difference. I'm hoping there's a better way. Cheers, Pete Yandell
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