i want to change these sysctl values:

net.inet.ipf.fr_tcpidletimeout: 864000
net.inet.ipf.fr_tcpclosewait: 60
net.inet.ipf.fr_tcplastack: 20
net.inet.ipf.fr_tcptimeout: 120
net.inet.ipf.fr_tcpclosed: 1
net.inet.ipf.fr_udptimeout: 120
net.inet.ipf.fr_icmptimeout: 120
	
i can change these in  http://xx.xx.xx.xx/exec.php
but don't known how to save it,or how to keep these 
values next the machine reboot.

if there any config file to keep these ?