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Session Report

Summary:
Test run at: 2019-06-17 18:38:11 GMT
Client Prefix (v4): 74.205.145.x/24
Client AS (v4): 39939 (RISE-CO-AS39939)
IPv4 Probes: 93
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable rewritten
Largest spoofable neighbor prefix length none
Spoof status key
receivedSpoofed packet was received.Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewrittenSpoofed packet was received, but the source address was changed en route.
blockedSpoofed packet was not received, but unspoofed packet was.
unknownNeither spoofed nor unspoofed packet was received.

Warnings:

IPv4 AS Route:
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 (74.205.145.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
74.205.145.x/24/3139939natblock
74.205.145.x/24/3039939natblock
74.205.145.x/24/2939939rewritten
74.205.145.x/24/2839939rewritten
74.205.145.x/24/2739939rewritten
74.205.145.x/24/2639939rewritten
74.205.145.x/24/2539939rewritten
74.205.145.x/24/2439939rewritten
74.205.144.x/24/2339939rewritten
74.205.147.x/24/2239939rewritten
74.205.149.x/24/2139939rewritten
74.205.153.x/24/2039939rewritten
74.205.129.x/24/1926827rewritten
74.205.177.x/24/1853618rewritten
74.205.209.x/24/1736493rewritten
74.205.17.x/24/1627357rewritten
74.204.145.x/24/1535986rewritten
74.207.145.x/24/1414543rewritten
74.201.145.x/24/1313789rewritten
74.197.145.x/24/1219108rewritten
74.221.145.x/24/1123158rewritten
74.237.145.x/24/107018rewritten
74.141.145.x/24/910796rewritten
74.77.145.x/24/811351rewritten

Meaning of status in Received column:

natblockSpoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
rewrittenThe 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 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.
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