[squid-users] lookup host in http_access more often

Hi!

I am running a little proxy server. To prevent others from accessing it,
I set up a http_access allow directive to my dyndns account, which
resolves to my IP (my IP changes every 24 hours).

The problem is that Squid does not look up the IP as frequently as I
would like it to. How can I change this?

Martin