Session Report
Test run at: 2020-08-27 05:32:57 GMT
Client Prefix (v4): 203.159.71.x/24
Client AS (v4): 63528 (BKNIX-AS-AP)
IPv4 Probes: 75
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 blocked Routable ✔ received Largest spoofable neighbor prefix length /20
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.
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 (203.159.71.x/24) can spoof 4095 neighboring addresses (within your /20 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 203.159.71.x/24 /31 63528 yes 203.159.71.x/24 /30 63528 yes 203.159.71.x/24 /29 63528 yes 203.159.71.x/24 /28 63528 yes 203.159.71.x/24 /27 63528 yes 203.159.71.x/24 /26 63528 yes 203.159.71.x/24 /25 63528 yes 203.159.71.x/24 /24 63528 yes 203.159.70.x/24 /23 63528 yes 203.159.69.x/24 /22 UNROUTED natblock 203.159.67.x/24 /21 137856 natblock 203.159.79.x/24 /20 137856 yes 203.159.87.x/24 /19 54103 natblock 203.159.103.x/24 /18 17887 natblock 203.159.7.x/24 /17 4767 natblock 203.159.199.x/24 /16 4621 natblock 203.158.71.x/24 /15 UNROUTED natblock 203.157.71.x/24 /14 9649 natblock 203.155.71.x/24 /13 7693 natblock 203.151.71.x/24 /12 4618 natblock 203.143.71.x/24 /11 10105 natblock 203.191.71.x/24 /10 UNROUTED natblock 203.223.71.x/24 /9 UNROUTED natblock 203.31.71.x/24 /8 9449 natblock 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.
IPv4 Outbound Filtering Depth:
The tracefilter test found your host able to spoof routable, non-adjacent source addresses through the first 3 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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