Session Report
Test run at: 2020-03-04 12:45:05 GMT
Client Prefix (v4): 131.0.60.x/24
Client AS (v4): 61704
IPv4 Probes: 75
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.
IPv4 Adjacent Netblock Testing:
Your host (131.0.60.x/24) can spoof 1023 neighboring addresses (within your /22 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 rewritten 131.0.52.x/24 /20 3549 rewritten 131.0.44.x/24 /19 262621 rewritten 131.0.28.x/24 /18 28210 rewritten 131.0.124.x/24 /17 UNROUTED rewritten 131.0.188.x/24 /16 61708 rewritten 131.1.60.x/24 /15 3269 rewritten 131.2.60.x/24 /14 UNROUTED rewritten 131.4.60.x/24 /13 721 rewritten 131.8.60.x/24 /12 UNROUTED rewritten 131.16.60.x/24 /11 721 rewritten 131.32.60.x/24 /10 385 rewritten 131.64.60.x/24 /9 27064 rewritten 131.128.60.x/24 /8 14348 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 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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