net.ip.portrange.*
The net.inet.ip.portrange.* sysctl variables control the port number ranges automatically bound to TCP and UDP sockets.
net.inet.ip.portrange.first, net.inet.ip.portrange.last
Use the default range of values, normally net.inet.ip.portrange.hifirst through net.inet.ip.portrange.hilast. This is adjustable.
net.inet.ip.portrange.hifirst, net.inet.ip.portrange.hilast
Use a high range of values
net.inet.ip.portrange.lowfirst, net.inet.ip.portrange.lowlast
Use a low range of ports, which are normally restricted to privileged processes on UNIX systems.
net.inet.ip.redirect
Enable sending IP redirects Allow (1) or disallow (0) send ICMP redirections when forwarding. This option is ignored unless the host is routing IP packets. Normally, this option should be enabled on all systems.
type: boolean, dafault: 1
net.inet.ip.ttl
The maximum time-to-live (hop count) value for an IP packet sourced by the system. This value applies to normal transport protocols, not to ICMP.
type: integer, dafault: 64
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