Test run at: 2019-10-02 14:58:52 GMT
Client Prefix (v4): 208.81.4.x/24
Client AS (v4): 18451 (LESNET)
IPv4 Probes: 72
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 rewritten Routable ✔ received Largest spoofable neighbor prefix length none
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.
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 (208.81.4.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon) Prefix
ASN of spoofed
Received 208.81.4.x/24 /31 18451 rewritten 208.81.4.x/24 /30 18451 rewritten 208.81.4.x/24 /29 18451 rewritten 208.81.4.x/24 /28 18451 rewritten 208.81.4.x/24 /27 18451 rewritten 208.81.4.x/24 /26 18451 rewritten 208.81.4.x/24 /25 18451 rewritten 208.81.4.x/24 /24 18451 rewritten 208.81.5.x/24 /23 18451 rewritten 208.81.6.x/24 /22 18451 rewritten 208.81.0.x/24 /21 18451 rewritten 208.81.12.x/24 /20 17382 rewritten 208.81.20.x/24 /19 10340 rewritten 208.81.36.x/24 /18 33010 rewritten 208.81.68.x/24 /17 14600 rewritten 208.81.132.x/24 /16 UNROUTED rewritten 208.80.4.x/24 /15 47002 rewritten 208.83.4.x/24 /14 395336 rewritten 208.85.4.x/24 /13 40244 rewritten 208.89.4.x/24 /12 17359 rewritten 208.65.4.x/24 /11 25813 rewritten 208.113.4.x/24 /10 21570 rewritten 208.17.4.x/24 /9 1239 rewritten 208.209.4.x/24 /8 701 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).Summary:
The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.Feedback:
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