Session Report
Test run at: 2021-10-18 18:19:44 GMT
Client Prefix (v4): 131.0.60.x/24
Client AS (v4): 61704
IPv4 Probes: 66
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 blocked Routable received Largest spoofable neighbor prefix length /16
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.
IPv4 Adjacent Netblock Testing:
Your host (131.0.60.x/24) can spoof 65535 neighboring addresses (within your /16 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 131.0.60.x/24 /31 61704 natblock 131.0.60.x/24 /30 61704 natblock 131.0.60.x/24 /29 61704 yes 131.0.60.x/24 /28 61704 yes 131.0.60.x/24 /27 61704 yes 131.0.60.x/24 /26 61704 yes 131.0.60.x/24 /25 61704 yes 131.0.60.x/24 /24 61704 yes 131.0.61.x/24 /23 61704 yes 131.0.62.x/24 /22 61704 yes 131.0.56.x/24 /21 61874 yes 131.0.52.x/24 /20 3549 yes 131.0.44.x/24 /19 262621 yes 131.0.28.x/24 /18 28210 yes 131.0.124.x/24 /17 271133 yes 131.0.188.x/24 /16 61708 yes 131.1.60.x/24 /15 3269 sendto 131.2.60.x/24 /14 749 sendto 131.4.60.x/24 /13 721 sendto 131.8.60.x/24 /12 749 sendto 131.16.60.x/24 /11 721 sendto 131.32.60.x/24 /10 385 sendto 131.64.60.x/24 /9 27064 sendto 131.128.60.x/24 /8 14348 sendto Meaning of status in Received column:
yes Packets spoofed from adjacent netblock were received 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:
We welcome questions and feedback to the Spoofer Information Mailing List and invite users to join the Spoofer Users Mailing List for discussion and announcements.