Session Report
Test run at: 2021-05-20 20:42:53 GMT
Client Prefix (v4): 138.0.72.x/24
Client AS (v4): 264531
IPv4 Probes: 66
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 rewritten Routable ✔ received Largest spoofable neighbor prefix length /25
Spoof status key received Spoofed packet was received. ✔ 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.
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 (138.0.72.x/24) can spoof 127 neighboring addresses (within your /25 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 138.0.72.x/24 /31 264531 yes 138.0.72.x/24 /30 264531 yes 138.0.72.x/24 /29 264531 yes 138.0.72.x/24 /28 264531 yes 138.0.72.x/24 /27 264531 yes 138.0.72.x/24 /26 264531 natblock 138.0.72.x/24 /25 264531 yes 138.0.72.x/24 /24 264531 sendto 138.0.73.x/24 /23 264531 sendto 138.0.74.x/24 /22 264531 sendto 138.0.76.x/24 /21 264540 sendto 138.0.64.x/24 /20 262595 sendto 138.0.88.x/24 /19 264646 sendto 138.0.104.x/24 /18 262216 sendto 138.0.8.x/24 /17 52349 sendto 138.0.200.x/24 /16 263581 sendto 138.1.72.x/24 /15 31898 sendto 138.2.72.x/24 /14 UNROUTED sendto 138.4.72.x/24 /13 766 sendto 138.8.72.x/24 /12 UNROUTED sendto 138.16.72.x/24 /11 11078 sendto 138.32.72.x/24 /10 UNROUTED sendto 138.64.72.x/24 /9 4685 sendto 138.128.72.x/24 /8 55286 sendto Meaning of status in Received column:
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. 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.Feedback:
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