macos_ephemeral_ports_fix.sh

#!/bin/bash

# fix for MacOS X users running out of ephemeral ports
# if network benchmark tools such as 'siege' or 'ab' freeze for several seconds:
# http://stackoverflow.com/questions/1216267/ab-program-freezes-after-lots-of-requests-why

# Enter sudo mode
sudo -i

# factory default as of Mac OS X 10.13.6; changing (lowering) this interferes with DNS resolution in most apps
sysctl -w net.inet.ip.portrange.first=49152
echo "net.inet.ip.portrange.first=49152" >> /etc/sysctl.conf

# net.inet.tcp.msl: 15000 -> 1000; controls WAIT_TIMEOUT, makes unused connections available to tools like siege sooner
sysctl -w net.inet.tcp.msl=1000
echo "net.inet.tcp.msl=1000" >> /etc/sysctl.conf

# kern.ipc.somaxconn: 128 -> 8192; because we can
sysctl -w kern.ipc.somaxconn=8192
echo "kern.ipc.somaxconn=8192" >> /etc/sysctl.conf

# based on: https://gist.github.com/jpmx/4111000