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 (172.81.129.x/24) can spoof 2047 neighboring addresses (within your /21 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
172.81.129.x/24
/31
27176
yes
172.81.129.x/24
/30
27176
yes
172.81.129.x/24
/29
27176
yes
172.81.129.x/24
/28
27176
yes
172.81.129.x/24
/27
27176
yes
172.81.129.x/24
/26
27176
yes
172.81.129.x/24
/25
27176
yes
172.81.129.x/24
/24
27176
yes
172.81.128.x/24
/23
27176
yes
172.81.131.x/24
/22
27176
yes
172.81.133.x/24
/21
27176
yes
172.81.137.x/24
/20
32924
no
172.81.145.x/24
/19
19620
no
172.81.161.x/24
/18
14265
no
172.81.193.x/24
/17
45090
no
172.81.1.x/24
/16
UNROUTED
no
172.80.129.x/24
/15
197207
no
172.83.129.x/24
/14
16942
no
172.85.129.x/24
/13
16504
no
172.89.129.x/24
/12
20001
no
172.65.129.x/24
/11
13335
no
172.113.129.x/24
/10
20001
no
172.17.129.x/24
/9
UNROUTED
no
172.209.129.x/24
/8
UNROUTED
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 3 IP hop(s).
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
