>> one case that comes to mind is PMTU. I've seen first hand instances where a corporation blocked all ICMP traffic, and then some of my users couldn't access that companies website. For whatever reason, the remote web server had a smaller than normal MTU size <<
Yes - ICMP should be blocked selectively. PING clearly is nice to have for support/diagnostic - it is NOT needed for regular operation.
If Declude wants to make sure that the connection to their DNS server works - then they should test the connection to a DNS port. Those ports ARE open.
Agreed 100% :-)
-Russ
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