Test run at: 2018-07-25 21:52:01 GMT
Client Prefix (v4): 4.30.124.x/24
Client AS (v4): 3356 (LEVEL3)
IPv4 Probes: 99
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 rewritten Routable ✔ received Largest spoofable neighbor prefix length /8
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 (4.30.124.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon) Prefix
ASN of spoofed
Received 4.30.124.x/24 /31 3356 yes 4.30.124.x/24 /30 3356 natblock 4.30.124.x/24 /29 3356 yes 4.30.124.x/24 /28 3356 yes 4.30.124.x/24 /27 3356 yes 4.30.124.x/24 /26 3356 yes 4.30.124.x/24 /25 3356 yes 4.30.124.x/24 /24 3356 yes 4.30.125.x/24 /23 3356 yes 4.30.126.x/24 /22 3356 yes 4.30.120.x/24 /21 3356 yes 4.30.116.x/24 /20 3356 yes 4.30.108.x/24 /19 3356 yes 4.30.92.x/24 /18 3356 yes 4.30.60.x/24 /17 3356 yes 4.30.252.x/24 /16 3356 yes 4.31.124.x/24 /15 3356 yes 4.28.124.x/24 /14 3356 yes 4.26.124.x/24 /13 3356 natblock 4.22.124.x/24 /12 3356 natblock 4.14.124.x/24 /11 3356 natblock 4.62.124.x/24 /10 3356 natblock 4.94.124.x/24 /9 3356 yes 4.158.124.x/24 /8 3356 yes
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.
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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