Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewritten
Spoofed packet was received, but the source address was changed en route.
blocked
Spoofed packet was not received, but unspoofed packet was.
unknown
Neither spoofed nor unspoofed packet was received.
IPv4 AS Route:
This test run probed the following paths in order to infer your
ability to send different spoofed source packets. Each node
in the graph corresponds to an autonomous system, i.e.
different Internet service providers. NOTE: This graph does NOT show if
an AS blocks spoofed packets, only the path taken by received spoofed
packets. The IP Path Details
are available for this run. If non-spoofed packets weren't received at
a destination, the traceroute to that destination is not included in this
graph and may even cause a totally empty graph.
IPv4 Adjacent Netblock Testing:
Your host (212.76.254.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
212.76.254.x/24
/31
44216
natblock
212.76.254.x/24
/30
44216
natblock
212.76.254.x/24
/29
44216
natblock
212.76.254.x/24
/28
44216
natblock
212.76.254.x/24
/27
44216
natblock
212.76.254.x/24
/26
44216
natblock
212.76.254.x/24
/25
44216
natblock
212.76.254.x/24
/24
44216
natblock
212.76.255.x/24
/23
44216
natblock
212.76.252.x/24
/22
44216
natblock
212.76.250.x/24
/21
44216
natblock
212.76.246.x/24
/20
44216
natblock
212.76.238.x/24
/19
6848
natblock
212.76.222.x/24
/18
12571
natblock
212.76.190.x/24
/17
12685
natblock
212.76.126.x/24
/16
42925
natblock
212.77.254.x/24
/15
15388
natblock
212.78.254.x/24
/14
47580
natblock
212.72.254.x/24
/13
12859
natblock
212.68.254.x/24
/12
12392
natblock
212.92.254.x/24
/11
31272
natblock
212.108.254.x/24
/10
12301
natblock
212.12.254.x/24
/9
15804
natblock
212.204.254.x/24
/8
15879
natblock
Meaning of status in Received column:
natblock
Spoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
IPv4 Outbound Filtering Depth:
The tracefilter test found your host
able to spoof routable, non-adjacent source addresses through the
first 1 IP hop(s).
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.