Session Report
Test run at: 2022-11-01 20:16:01 GMT
Client Prefix (v4): 138.117.172.x/24
Client AS (v4): 264237
IPv4 Probes: 60
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 rewritten Routable received Largest spoofable neighbor prefix length /22
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 (138.117.172.x/24) can spoof 1023 neighboring addresses (within your /22 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 138.117.172.x/24 /31 264237 yes 138.117.172.x/24 /30 264237 yes 138.117.172.x/24 /29 264237 natblock 138.117.172.x/24 /28 264237 natblock 138.117.172.x/24 /27 264237 yes 138.117.172.x/24 /26 264237 yes 138.117.172.x/24 /25 264237 yes 138.117.172.x/24 /24 264237 yes 138.117.173.x/24 /23 264237 natblock 138.117.174.x/24 /22 264237 yes 138.117.168.x/24 /21 271851 rewritten 138.117.164.x/24 /20 264517 rewritten 138.117.188.x/24 /19 264238 rewritten 138.117.140.x/24 /18 52468 rewritten 138.117.236.x/24 /17 270661 rewritten 138.117.44.x/24 /16 270900 rewritten 138.116.172.x/24 /15 33004 rewritten 138.119.172.x/24 /14 611 rewritten 138.113.172.x/24 /13 54994 rewritten 138.125.172.x/24 /12 UNROUTED rewritten 138.101.172.x/24 /11 9593 rewritten 138.85.172.x/24 /10 8147 rewritten 138.53.172.x/24 /9 UNROUTED rewritten 138.245.172.x/24 /8 12816 rewritten 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. 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 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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