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 (36.50.58.x/24) can spoof 1 neighboring addresses (within your /31 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
36.50.58.x/24
/31
152107
yes
36.50.58.x/24
/30
152107
natblock
36.50.58.x/24
/29
152107
rewritten
36.50.58.x/24
/28
152107
rewritten
36.50.58.x/24
/27
152107
natblock
36.50.58.x/24
/26
152107
rewritten
36.50.58.x/24
/25
152107
natblock
36.50.58.x/24
/24
152107
rewritten
36.50.59.x/24
/23
142636
rewritten
36.50.56.x/24
/22
152029
natblock
36.50.62.x/24
/21
151868
natblock
36.50.50.x/24
/20
148000
natblock
36.50.42.x/24
/19
17802
natblock
36.50.26.x/24
/18
135983
rewritten
36.50.122.x/24
/17
58495
rewritten
36.50.186.x/24
/16
58495
rewritten
36.51.58.x/24
/15
UNROUTED
rewritten
36.48.58.x/24
/14
4134
natblock
36.54.58.x/24
/13
10013
natblock
36.58.58.x/24
/12
4134
natblock
36.34.58.x/24
/11
4837
natblock
36.18.58.x/24
/10
4134
natblock
36.114.58.x/24
/9
58519
rewritten
36.178.58.x/24
/8
9808
natblock
Meaning of status in Received column:
yes
Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
natblock
Spoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
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.
