ICMP blocking on PIX .4.4.1

[phred () pacificwest com]

Yesterday our site underwent a Smurf attack which we quickly stopped by blocking ICMP traffic through the firewall.  I 
have a need to perform tracerouts from inside to the outside through the PIX firewall (v 4.4.1.)  Is there a way to 
allow ping and traceroute from inside to outside and still defend against smurf like attacks?

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