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Created July 14, 2019 17:45
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Increase ephemeral port range on macOS
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ab_portrange_on_mac.md

The default ephemeral port range on macOS/OSX is 49152-65535, which is only 16,383 ports:

$ sysctl -a | grep portrange
net.inet.ip.portrange.lowfirst: 1023
net.inet.ip.portrange.lowlast: 600
net.inet.ip.portrange.first: 49152
net.inet.ip.portrange.last: 65535
net.inet.ip.portrange.hifirst: 49152
net.inet.ip.portrange.hilast: 65535

To increase the range, we can reduce the value of first and hifirst:

sudo sysctl -w net.inet.ip.portrange.first=32768
sudo sysctl -w net.inet.ip.portrange.hifirst=32768

References

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