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 (187.120.197.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
187.120.197.x/24
/31
53140
no
187.120.197.x/24
/30
53140
sendto
187.120.197.x/24
/29
53140
sendto
187.120.197.x/24
/28
53140
sendto
187.120.197.x/24
/27
53140
sendto
187.120.197.x/24
/26
53140
sendto
187.120.197.x/24
/25
53140
sendto
187.120.197.x/24
/24
53140
sendto
187.120.196.x/24
/23
53140
sendto
187.120.199.x/24
/22
52863
sendto
187.120.193.x/24
/21
53140
sendto
187.120.205.x/24
/20
53140
sendto
187.120.213.x/24
/19
262721
sendto
187.120.229.x/24
/18
262722
sendto
187.120.133.x/24
/17
262272
sendto
187.120.69.x/24
/16
28202
sendto
187.121.197.x/24
/15
53131
sendto
187.122.197.x/24
/14
28573
sendto
187.124.197.x/24
/13
7738
sendto
187.112.197.x/24
/12
18881
sendto
187.104.197.x/24
/11
28573
sendto
187.88.197.x/24
/10
26599
sendto
187.56.197.x/24
/9
27699
sendto
187.248.197.x/24
/8
22566
sendto
Meaning of status in Received column:
no
Packets spoofed from adjacent netblock were not received, probably due to blocking
sendto
The spoofer client was unable to send spoofed headers due to an operating system restriction.
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.
