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 (193.0.21.x/24) can spoof 3 neighboring addresses (within your /30 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
193.0.21.x/24
/31
3333
sendto
193.0.21.x/24
/30
3333
yes
193.0.21.x/24
/29
3333
sendto
193.0.21.x/24
/28
3333
sendto
193.0.21.x/24
/27
3333
no
193.0.21.x/24
/26
3333
sendto
193.0.21.x/24
/25
3333
sendto
193.0.21.x/24
/24
3333
sendto
193.0.20.x/24
/23
3333
sendto
193.0.23.x/24
/22
3333
sendto
193.0.17.x/24
/21
UNROUTED
sendto
193.0.29.x/24
/20
2121
sendto
193.0.5.x/24
/19
3333
no
193.0.53.x/24
/18
UNROUTED
sendto
193.0.85.x/24
/17
8890
sendto
193.0.149.x/24
/16
47586
sendto
193.1.21.x/24
/15
1213
sendto
193.2.21.x/24
/14
2107
sendto
193.4.21.x/24
/13
12969
sendto
193.8.21.x/24
/12
21222
sendto
193.16.21.x/24
/11
3257
sendto
193.32.21.x/24
/10
34142
no
193.64.21.x/24
/9
719
sendto
193.128.21.x/24
/8
702
sendto
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)
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.
