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 (131.153.158.x/24) can spoof 63 neighboring addresses (within your /26 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
131.153.158.x/24
/31
60558
yes
131.153.158.x/24
/30
60558
yes
131.153.158.x/24
/29
60558
yes
131.153.158.x/24
/28
60558
no
131.153.158.x/24
/27
60558
no
131.153.158.x/24
/26
60558
yes
131.153.158.x/24
/25
60558
no
131.153.158.x/24
/24
60558
no
131.153.159.x/24
/23
59210
no
131.153.156.x/24
/22
19437
no
131.153.154.x/24
/21
19437
no
131.153.150.x/24
/20
19437
no
131.153.142.x/24
/19
20454
no
131.153.190.x/24
/18
19437
no
131.153.222.x/24
/17
19437
no
131.153.30.x/24
/16
11572
no
131.152.158.x/24
/15
559
no
131.155.158.x/24
/14
1161
no
131.157.158.x/24
/13
UNROUTED
no
131.145.158.x/24
/12
UNROUTED
no
131.137.158.x/24
/11
3766
no
131.185.158.x/24
/10
UNROUTED
no
131.217.158.x/24
/9
7573
no
131.25.158.x/24
/8
367
no
Meaning of status in Received column:
no
Packets spoofed from adjacent netblock were not received, probably due to blocking
yes
Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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.
