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 (191.7.37.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
191.7.37.x/24
/31
263309
rewritten
191.7.37.x/24
/30
263309
rewritten
191.7.37.x/24
/29
263309
rewritten
191.7.37.x/24
/28
263309
rewritten
191.7.37.x/24
/27
263309
rewritten
191.7.37.x/24
/26
263309
rewritten
191.7.37.x/24
/25
263309
rewritten
191.7.37.x/24
/24
263309
rewritten
191.7.36.x/24
/23
263309
rewritten
191.7.39.x/24
/22
263309
rewritten
191.7.33.x/24
/21
263309
rewritten
191.7.45.x/24
/20
263310
rewritten
191.7.53.x/24
/19
263311
rewritten
191.7.5.x/24
/18
263304
rewritten
191.7.101.x/24
/17
263596
rewritten
191.7.165.x/24
/16
263322
rewritten
191.6.37.x/24
/15
262288
rewritten
191.5.37.x/24
/14
263531
rewritten
191.3.37.x/24
/13
7738
rewritten
191.15.37.x/24
/12
26599
rewritten
191.23.37.x/24
/11
27699
rewritten
191.39.37.x/24
/10
53037
rewritten
191.71.37.x/24
/9
UNROUTED
rewritten
191.135.37.x/24
/8
26615
rewritten
Meaning of status in Received column:
rewritten
The source address of the probe packets we received differs from the spoofed address. It appears that an intermediate device is rewriting your packet headers.
IPv4 Outbound Filtering Depth:
The tracefilter test found your host
able to spoof routable, non-adjacent source addresses through the
first 1 IP hop(s).
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
