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 (138.255.218.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon)
Prefix Length
ASN of spoofed source address
Received
138.255.218.x/24
/31
263978
natblock
138.255.218.x/24
/30
263978
natblock
138.255.218.x/24
/29
263978
natblock
138.255.218.x/24
/28
263978
natblock
138.255.218.x/24
/27
263978
natblock
138.255.218.x/24
/26
263978
natblock
138.255.218.x/24
/25
263978
natblock
138.255.218.x/24
/24
263978
natblock
138.255.219.x/24
/23
263978
natblock
138.255.216.x/24
/22
263978
natblock
138.255.222.x/24
/21
263994
natblock
138.255.210.x/24
/20
263977
natblock
138.255.202.x/24
/19
264512
natblock
138.255.250.x/24
/18
264605
natblock
138.255.154.x/24
/17
27903
natblock
138.255.90.x/24
/16
264607
natblock
138.254.218.x/24
/15
243
natblock
138.253.218.x/24
/14
786
natblock
138.251.218.x/24
/13
786
natblock
138.247.218.x/24
/12
23122
natblock
138.239.218.x/24
/11
8075
natblock
138.223.218.x/24
/10
3303
natblock
138.191.218.x/24
/9
12511
natblock
138.127.218.x/24
/8
UNROUTED
natblock
Meaning of status in Received column:
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
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.
