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 (187.19.101.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
187.19.101.x/24
/31
28130
no
187.19.101.x/24
/30
28130
no
187.19.101.x/24
/29
28130
yes
187.19.101.x/24
/28
28130
yes
187.19.101.x/24
/27
28130
yes
187.19.101.x/24
/26
28130
yes
187.19.101.x/24
/25
28130
yes
187.19.101.x/24
/24
28130
yes
187.19.100.x/24
/23
28130
yes
187.19.103.x/24
/22
28130
yes
187.19.97.x/24
/21
28130
yes
187.19.109.x/24
/20
28130
yes
187.19.117.x/24
/19
53160
yes
187.19.69.x/24
/18
28129
yes
187.19.37.x/24
/17
28127
yes
187.19.229.x/24
/16
28126
yes
187.18.101.x/24
/15
22689
yes
187.17.101.x/24
/14
7162
yes
187.23.101.x/24
/13
28573
yes
187.27.101.x/24
/12
22085
yes
187.3.101.x/24
/11
28573
yes
187.51.101.x/24
/10
10429
yes
187.83.101.x/24
/9
26615
yes
187.147.101.x/24
/8
8151
yes
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
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 10 IP hop(s).
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
