Session Report
Test run at: 2022-01-15 21:33:33 GMT
Client Prefix (v4): 185.66.193.x/24
Client AS (v4): 201701 (FFRL-AS)
IPv4 Probes: 63
Outbound spoofing summary (from the client to our server) Source address type IPv4 Private - RFC1918 blocked 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.
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 (185.66.193.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 185.66.193.x/24 /31 201701 rewritten 185.66.193.x/24 /30 201701 yes 185.66.193.x/24 /29 201701 yes 185.66.193.x/24 /28 201701 yes 185.66.193.x/24 /27 201701 yes 185.66.193.x/24 /26 201701 yes 185.66.193.x/24 /25 201701 yes 185.66.193.x/24 /24 201701 yes 185.66.192.x/24 /23 201701 yes 185.66.195.x/24 /22 201701 yes 185.66.197.x/24 /21 12843 yes 185.66.201.x/24 /20 201702 yes 185.66.209.x/24 /19 31641 yes 185.66.225.x/24 /18 59914 yes 185.66.129.x/24 /17 29238 yes 185.66.65.x/24 /16 25394 yes 185.67.193.x/24 /15 35206 yes 185.64.193.x/24 /14 199139 yes 185.70.193.x/24 /13 201573 yes 185.74.193.x/24 /12 201453 yes 185.82.193.x/24 /11 57112 yes 185.98.193.x/24 /10 30880 yes 185.2.193.x/24 /9 UNROUTED natblock 185.194.193.x/24 /8 206702 yes 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. 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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