Test run at: 2016-12-21 22:01:23 GMT
Client Prefix (v4): 81.27.4.x/24
Client AS (v4): 13189 (LIDERO)
IPv4 Probes: 104
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 rewritten Routable rewritten 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.
IPv4 Adjacent Netblock Testing:
Your host (81.27.4.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon) Prefix
ASN of spoofed
Received 81.27.4.x/24 /31 13189 rewritten 81.27.4.x/24 /30 13189 rewritten 81.27.4.x/24 /29 13189 rewritten 81.27.4.x/24 /28 13189 rewritten 81.27.4.x/24 /27 13189 rewritten 81.27.4.x/24 /26 13189 rewritten 81.27.4.x/24 /25 13189 rewritten 81.27.4.x/24 /24 13189 rewritten 81.27.5.x/24 /23 13189 rewritten 81.27.6.x/24 /22 13189 rewritten 81.27.0.x/24 /21 13189 rewritten 81.27.12.x/24 /20 13189 rewritten 81.27.20.x/24 /19 39509 rewritten 81.27.36.x/24 /18 8542 rewritten 81.27.68.x/24 /17 25577 rewritten 81.27.132.x/24 /16 24880 rewritten 81.26.4.x/24 /15 24848 rewritten 81.25.4.x/24 /14 24789 rewritten 81.31.4.x/24 /13 8928 rewritten 81.19.4.x/24 /12 24641 rewritten 81.11.4.x/24 /11 UNROUTED rewritten 81.59.4.x/24 /10 13127 rewritten 81.91.4.x/24 /9 3301 rewritten 81.155.4.x/24 /8 2856 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 15 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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