Something

net.inet.ip.forwarding=0
net.inet.tcp.always_keepalive=1
kern.ipc.somaxconn=1024
net.inet.tcp.delayed_ack=0
net.inet.ip.portrange.last=30000
net.link.ether.inet.max_age=1200
net.inet.ip.sourceroute=0
net.inet.ip.accept_sourceroute=0
net.inet.icmp.bmcastecho=0
net.inet.icmp.maskrepl=0
net.inet.ip.portrange.lowfirst=1023
net.inet.ip.portrange.lowlast=600
net.inet.ip.portrange.first=1024
net.inet.ip.portrange.last=65000
net.inet.ip.portrange.hifirst=1024
net.inet.ip.portrange.hilast=65535
net.inet.tcp.sendspace=131072
net.inet.tcp.recvspace=131072