Which ICMP packets to filter, which to allow to pass?

["Ralf G. R. Bergs" <rabe@RWTH-Aachen.DE>]

Hi there,

currently I'm allowing EVERYTHING but timestamp-requests. What else can I 
safely drop?

Or the other way round: Which packets do I absolutely need? I then could drop 
everything else.

Thanks,

Ralf


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