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Replacement for reading /proc/sys/net/ipv4/ip_forward to determine if IP forwarding

# Linux
# via procfs
cat /proc/sys/net/ipv4/ip_forward  # => 1
sysctl net.inet.ip.forwarding  # => net.ipv4.ip_forward = 1

# FreeBSD
# use sysctl (procfs deprecated)
sysctl net.inet.ip.forwarding  # => net.inet.ip.forwarding: 1