Question about icmp

Leslie Jensen leslie at
Wed Aug 20 17:26:28 UTC 2008

When setting up PF I found the recommendation to use the following rule 
to allow ICMP to pass.

# macros

# 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.



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