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Session Report

Summary:
Test run at: 2017-04-29 20:49:46 GMT
Client Prefix (v4): 138.121.140.x/24
Client AS (v4): 28317
IPv4 Probes: 91
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 (138.121.140.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
138.121.140.x/24/3128317natblock
138.121.140.x/24/3028317natblock
138.121.140.x/24/2928317rewritten
138.121.140.x/24/2828317rewritten
138.121.140.x/24/2728317rewritten
138.121.140.x/24/2628317rewritten
138.121.140.x/24/2528317rewritten
138.121.140.x/24/2428317rewritten
138.121.141.x/24/2328317rewritten
138.121.142.x/24/2228317rewritten
138.121.136.x/24/21264297rewritten
138.121.132.x/24/20264300rewritten
138.121.156.x/24/19263202rewritten
138.121.172.x/24/18263646rewritten
138.121.204.x/24/1761908rewritten
138.121.12.x/24/16262191rewritten
138.120.140.x/24/15203418rewritten
138.123.140.x/24/1416657rewritten
138.125.140.x/24/13UNROUTEDrewritten
138.113.140.x/24/1222373rewritten
138.105.140.x/24/11UNROUTEDrewritten
138.89.140.x/24/10701rewritten
138.57.140.x/24/9UNROUTEDrewritten
138.249.140.x/24/8UNROUTEDrewritten

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 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:
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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