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.
Warnings:
⚠️ Your host is behind a Network Address Translation (NAT) router or firewall but spoofed packets are still being received without modification. See here for more information.
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 (177.20.208.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
177.20.208.x/24
/31
262868
natblock
177.20.208.x/24
/30
262868
natblock
177.20.208.x/24
/29
262868
yes
177.20.208.x/24
/28
262868
yes
177.20.208.x/24
/27
262868
yes
177.20.208.x/24
/26
262868
yes
177.20.208.x/24
/25
262868
yes
177.20.208.x/24
/24
262868
yes
177.20.209.x/24
/23
262868
yes
177.20.210.x/24
/22
262868
yes
177.20.212.x/24
/21
262868
yes
177.20.216.x/24
/20
262868
yes
177.20.192.x/24
/19
262867
yes
177.20.240.x/24
/18
53240
yes
177.20.144.x/24
/17
262857
yes
177.20.80.x/24
/16
53239
yes
177.21.208.x/24
/15
262879
yes
177.22.208.x/24
/14
262902
yes
177.16.208.x/24
/13
18881
yes
177.28.208.x/24
/12
26615
yes
177.4.208.x/24
/11
8167
yes
177.52.208.x/24
/10
52986
yes
177.84.208.x/24
/9
262535
yes
177.148.208.x/24
/8
26615
yes
Meaning of status in Received column:
yes
Packets spoofed from adjacent netblock were received
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.
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).
IPv6 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.
IPv6 probes:
Spoofed source address
Destination
Received
2001:48d0:101:501::159
2001:48d0:101:501::242
yes
2001:4978:1fb:6400::d2
2001:48d0:101:501::242
yes
2001:49aa:111:aa00::11
2001:48d0:101:501::242
yes
fd11:1111:1111::1111
2001:48d0:101:501::242
yes
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
2804:328:c0xx::/40
/120
262868
yes
2804:328:c0xx::/40
/112
262868
yes
2804:328:c0xx::/40
/104
262868
yes
2804:328:c0xx::/40
/96
262868
yes
2804:328:c0xx::/40
/88
262868
yes
2804:328:c0xx::/40
/80
262868
yes
2804:328:c0xx::/40
/72
262868
yes
2804:328:c0xx::/40
/64
262868
yes
2804:328:c0xx::/40
/56
262868
yes
2804:328:c0xx::/40
/48
262868
yes
2804:328:c0xx::/40
/40
262868
yes
2804:328:40xx::/40
/32
262868
yes
2804:3a8:c0xx::/40
/24
53195
yes
2804:8328:c0xx::/40
/16
UNROUTED
yes
Meaning of status in Received column:
yes
Packets spoofed from adjacent netblock were received
yes
Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
