[time] Summary: icmp reachability?
ntpadmin at oc9.com
Thu Mar 22 04:24:13 UTC 2007
On Wed, 21 Mar 2007, Jeffrey Goldberg wrote:
> The short summary is that yes it is important to allow many kinds of
> ICMP messages through from smooth Internet operation.
> In particular, the message types 0, 3, 4, 8, 11, 12 are the most useful.
> ICMP, very broadly speaking, provides a mechanism for reporting
> failures of TCP and UCP packets. Failure in getting these message
> through can lead to (most commonly) very long timeouts and other
> connectivity problems. Full details are in the RFCs.
> None of this is specific to NTP, but is an IP thing in general.
> The reasons for blocking ICMP, Ping of Death, are well outdated.
> I'd like to thank everyone who took to time to educate me on these
Very interesting summary indeed. I will refresh my memory be looking at
what 0, 3, 4, 8, 11, 12 are for.
I am glad the ntp list helped you out!
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