Confused about ping...

Peter Gordon admin at ramshacklestudios.com
Thu Oct 6 20:43:52 UTC 2005


> $ ping 207.195.133.148
> PING 207.195.133.148 (207.195.133.148) 56(84) bytes of data.
>  From 209.120.242.6 icmp_seq=0 Packet filtered
>  From 209.120.242.6 icmp_seq=1 Packet filtered
>  From 209.120.242.6 icmp_seq=2 Packet filtered
>  From 209.120.242.6 icmp_seq=3 Packet filtered
>
> What does "Packet filtered" mean?
>

Ping works by sending an ICMP "Echo" data packet to the
specified host, and waiting for its ICMP "Echo Reply" data
packet (which, if successful, should be exactly the same as
the data sent in the original Echo packet). Many system
adminstrators filter this type of packet on their firewalls,
though, as ICMP ping requests can be used by malicious users to
cause a DoS (Denial of Service) on an otherwise-functional
system. That's probably what you're seeing.

Hope that helps!




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