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 (123.253.66.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
123.253.66.x/24
/31
134806
no
123.253.66.x/24
/30
134806
no
123.253.66.x/24
/29
134806
yes
123.253.66.x/24
/28
134806
yes
123.253.66.x/24
/27
134806
yes
123.253.66.x/24
/26
134806
yes
123.253.66.x/24
/25
134806
yes
123.253.66.x/24
/24
134806
yes
123.253.67.x/24
/23
134806
rewritten
123.253.64.x/24
/22
134806
yes
123.253.70.x/24
/21
UNROUTED
no
123.253.74.x/24
/20
136533
yes
123.253.82.x/24
/19
UNROUTED
no
123.253.98.x/24
/18
59362
yes
123.253.2.x/24
/17
9288
yes
123.253.194.x/24
/16
UNROUTED
no
123.252.66.x/24
/15
9924
yes
123.255.66.x/24
/14
3661
yes
123.249.66.x/24
/13
UNROUTED
no
123.245.66.x/24
/12
4134
yes
123.237.66.x/24
/11
UNROUTED
no
123.221.66.x/24
/10
4713
yes
123.189.66.x/24
/9
4837
yes
123.125.66.x/24
/8
4808
yes
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
yes
Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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 10 IP hop(s).
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
