Keep log_in_vain Value

[Matt "Cyber Dog" LaPlante]

Right now on a FreeBSD 4.7 box, net.inet.tcp.log_in_vain and
net.inet.udp.log_in_vain are both turned on.  I know they can be disabled
using sysctl, but this only fixes the problem until the machine is rebooted,
at which point they both come back on.  Due to our network configuration,
it's constantly displaying blocked port 53 from one of the other servers,
and I want UDP log_in_vain disabled permanently.  Where can I do this in the
configuration?  Thanks.