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 (91.236.239.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
91.236.239.x/24
/31
197922
yes
91.236.239.x/24
/30
197922
yes
91.236.239.x/24
/29
197922
yes
91.236.239.x/24
/28
197922
yes
91.236.239.x/24
/27
197922
yes
91.236.239.x/24
/26
197922
yes
91.236.239.x/24
/25
197922
yes
91.236.239.x/24
/24
197922
yes
91.236.238.x/24
/23
199732
yes
91.236.237.x/24
/22
60912
yes
91.236.235.x/24
/21
198716
yes
91.236.231.x/24
/20
57934
yes
91.236.255.x/24
/19
197922
yes
91.236.207.x/24
/18
196793
yes
91.236.175.x/24
/17
60831
yes
91.236.111.x/24
/16
33962
yes
91.237.239.x/24
/15
198657
yes
91.238.239.x/24
/14
29383
yes
91.232.239.x/24
/13
57554
yes
91.228.239.x/24
/12
57487
yes
91.252.239.x/24
/11
24608
yes
91.204.239.x/24
/10
47752
yes
91.172.239.x/24
/9
12322
yes
91.108.239.x/24
/8
197426
yes
Meaning of status in Received column:
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.