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 (103.120.112.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
103.120.112.x/24
/31
135419
rewritten
103.120.112.x/24
/30
135419
rewritten
103.120.112.x/24
/29
135419
rewritten
103.120.112.x/24
/28
135419
rewritten
103.120.112.x/24
/27
135419
rewritten
103.120.112.x/24
/26
135419
rewritten
103.120.112.x/24
/25
135419
rewritten
103.120.112.x/24
/24
135419
rewritten
103.120.113.x/24
/23
135419
rewritten
103.120.114.x/24
/22
135419
rewritten
103.120.116.x/24
/21
138039
rewritten
103.120.120.x/24
/20
55559
rewritten
103.120.96.x/24
/19
UNROUTED
rewritten
103.120.80.x/24
/18
139021
rewritten
103.120.48.x/24
/17
138023
rewritten
103.120.240.x/24
/16
135048
rewritten
103.121.112.x/24
/15
UNROUTED
rewritten
103.122.112.x/24
/14
138215
rewritten
103.124.112.x/24
/13
131111
rewritten
103.112.112.x/24
/12
UNROUTED
rewritten
103.104.112.x/24
/11
136705
rewritten
103.88.112.x/24
/10
24088
rewritten
103.56.112.x/24
/9
55933
rewritten
103.248.112.x/24
/8
55832
rewritten
Meaning of status in Received column:
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).
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
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
2403:56c0:5xx::/40
/120
135419
rewritten
2403:56c0:5xx::/40
/112
135419
rewritten
2403:56c0:5xx::/40
/104
135419
rewritten
2403:56c0:5xx::/40
/96
135419
rewritten
2403:56c0:5xx::/40
/88
135419
rewritten
2403:56c0:5xx::/40
/80
135419
rewritten
2403:56c0:5xx::/40
/72
135419
rewritten
2403:56c0:5xx::/40
/64
135419
rewritten
2403:56c0:5xx::/40
/56
135419
rewritten
2403:56c0:5xx::/40
/48
135419
rewritten
2403:56c0:5xx::/40
/40
135419
rewritten
2403:56c0:85xx::/40
/32
135419
rewritten
2403:5640:5xx::/40
/24
UNROUTED
rewritten
2403:d6c0:5xx::/40
/16
UNROUTED
rewritten
Meaning of status in Received column:
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.
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
