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 (87.251.76.x/24) can spoof 255 neighboring addresses (within your /24 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
87.251.76.x/24
/31
199785
yes
87.251.76.x/24
/30
199785
yes
87.251.76.x/24
/29
199785
yes
87.251.76.x/24
/28
199785
yes
87.251.76.x/24
/27
199785
yes
87.251.76.x/24
/26
199785
yes
87.251.76.x/24
/25
199785
yes
87.251.76.x/24
/24
199785
yes
87.251.77.x/24
/23
199785
no
87.251.78.x/24
/22
199785
no
87.251.72.x/24
/21
52000
no
87.251.68.x/24
/20
210512
no
87.251.92.x/24
/19
41187
no
87.251.108.x/24
/18
12389
no
87.251.12.x/24
/17
UNROUTED
no
87.251.204.x/24
/16
29518
no
87.250.76.x/24
/15
25488
no
87.249.76.x/24
/14
15641
no
87.255.76.x/24
/13
43588
no
87.243.76.x/24
/12
197214
no
87.235.76.x/24
/11
12430
no
87.219.76.x/24
/10
12479
no
87.187.76.x/24
/9
3320
no
87.123.76.x/24
/8
8881
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
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.
