Re: Confused about ping...
From: Peter Gordon (admin_at_ramshacklestudios.com)
Date: Thu, 6 Oct 2005 15:43:52 -0500 (CDT) To: "For users of Fedora Core releases" <email@example.com>
> $ ping 220.127.116.11
> PING 18.104.22.168 (22.214.171.124) 56(84) bytes of data.
> From 126.96.36.199 icmp_seq=0 Packet filtered
> From 188.8.131.52 icmp_seq=1 Packet filtered
> From 184.108.40.206 icmp_seq=2 Packet filtered
> From 220.127.116.11 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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