[ntp:questions] ntpd without binding?

[t_pascal at my-deja.com]

Using ntp-4.1.2 on RedHat ES 3, I'd like to configure a "client only"
ntp system.  Easy enough to edit ntp.conf, but I'm trying to get ntpd
to stop listening on port 123 (blocked by iptables anyway).  Any way to
stop binding to interfaces, or select which (internal) interface I want
to listen only?