ICMP from within only

From: Mike D (d01f1n@yahoo.com)
Date: 12/10/01 

From: Mike D <d01f1n@yahoo.com>
To: freebsd-security@freebsd.org
Date: Mon, 10 Dec 2001 07:52:07 +0000

Is it possible to define a rule that will allow through pings and
traceroutes, but only the ones initiated from within the firewall?

Thanks for any advice!

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