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 (103.167.135.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
103.167.135.x/24
/31
38136
no
103.167.135.x/24
/30
38136
no
103.167.135.x/24
/29
38136
no
103.167.135.x/24
/28
38136
no
103.167.135.x/24
/27
38136
no
103.167.135.x/24
/26
38136
no
103.167.135.x/24
/25
38136
no
103.167.135.x/24
/24
38136
no
103.167.134.x/24
/23
38136
no
103.167.133.x/24
/22
139456
no
103.167.131.x/24
/21
137127
no
103.167.143.x/24
/20
9875
no
103.167.151.x/24
/19
63473
no
103.167.167.x/24
/18
141984
no
103.167.199.x/24
/17
140833
no
103.167.7.x/24
/16
UNROUTED
no
103.166.135.x/24
/15
142114
no
103.165.135.x/24
/14
17995
no
103.163.135.x/24
/13
141902
no
103.175.135.x/24
/12
UNROUTED
no
103.183.135.x/24
/11
133296
no
103.135.135.x/24
/10
58689
no
103.231.135.x/24
/9
59361
no
103.39.135.x/24
/8
133694
no
Meaning of status in Received column:
no
Packets spoofed from adjacent netblock were not received, probably due to blocking
IPv4 Outbound Filtering Depth:
The tracefilter test found your host
unable to spoof routable, non-adjacent source addresses through
even the first IP hop.
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
2407:cdc0:afxx::/40
/120
38136
rewritten
2407:cdc0:afxx::/40
/112
38136
rewritten
2407:cdc0:afxx::/40
/104
38136
rewritten
2407:cdc0:afxx::/40
/96
38136
rewritten
2407:cdc0:afxx::/40
/88
38136
rewritten
2407:cdc0:afxx::/40
/80
38136
rewritten
2407:cdc0:afxx::/40
/72
38136
rewritten
2407:cdc0:afxx::/40
/64
38136
rewritten
2407:cdc0:afxx::/40
/56
38136
rewritten
2407:cdc0:afxx::/40
/48
38136
rewritten
2407:cdc0:afxx::/40
/40
38136
rewritten
2407:cdc0:2fxx::/40
/32
UNROUTED
rewritten
2407:cd40:afxx::/40
/24
UNROUTED
rewritten
2407:4dc0:afxx::/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.