[SQU] Squid and listening UDP ports

Greetings,
I am using squid on our firewall instead of (or in accompaniment to) TIS
toolkit.

My concern is that squid listens on UDP ports (seemingly at random,
sometimes even *!) on all interfaces.

I do NOT want squid open for business on the outside interface.

How do I shut down, or at least restrict to a particular interface, squid's
UDP ports?

Thanks in advance,
Randy Bey

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