From owner-freebsd-pf@FreeBSD.ORG  Wed Aug 20 17:26:28 2008
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Date: Wed, 20 Aug 2008 19:26:20 +0200
From: Leslie Jensen <leslie@eskk.nu>
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Subject: Question about icmp
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When setting up PF I found the recommendation to use the following rule 
to allow ICMP to pass.

# macros
icmp_types="echoreq"

# filter rules
pass in inet proto icmp all icmp-type $icmp_types keep state

I do not understand why this is necessary!

Will someone Please explain to me why it's necessary if I must have it, 
or if I can delete that rule.

Thanks

/Leslie