icmp packets - disabling via sysctl, or cisco switch ... ?

[User Freebsd]

Two part question here ...

first part ... is there a way of just disabling icmp by setting a sysctl, 
so that a server just doesn't respond to them?

second part ... is there a way of telling a cisco switch to drop all icmp 
packets, preferrably to all but an exception list, but to everywhere works 
as well ...

I'm running a Cisco 2950-24 ...

thanks ...

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Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email . scrappy at hub.org                              MSN . scrappy at hub.org
Yahoo . yscrappy               Skype: hub.org        ICQ . 7615664