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 (156.236.16.x/24) can spoof 255 neighboring addresses (within your /24 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
156.236.16.x/24
/31
208287
yes
156.236.16.x/24
/30
208287
yes
156.236.16.x/24
/29
208287
yes
156.236.16.x/24
/28
208287
yes
156.236.16.x/24
/27
208287
yes
156.236.16.x/24
/26
208287
yes
156.236.16.x/24
/25
208287
yes
156.236.16.x/24
/24
208287
yes
156.236.17.x/24
/23
UNROUTED
no
156.236.18.x/24
/22
9009
no
156.236.20.x/24
/21
140403
no
156.236.24.x/24
/20
21859
no
156.236.0.x/24
/19
22773
no
156.236.48.x/24
/18
35916
no
156.236.80.x/24
/17
UNROUTED
no
156.236.144.x/24
/16
35916
no
156.237.16.x/24
/15
22773
no
156.238.16.x/24
/14
133712
no
156.232.16.x/24
/13
136907
no
156.228.16.x/24
/12
328608
no
156.252.16.x/24
/11
328608
no
156.204.16.x/24
/10
8452
no
156.172.16.x/24
/9
36992
no
156.108.16.x/24
/8
36081
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
unable to spoof routable, non-adjacent source addresses through
even the first IP hop.
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
