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Session Report

Summary:
Test run at: 2023-01-03 18:17:40 GMT
Client Prefix (v4): 187.156.78.x/24
Client AS (v4): 8151
IPv4 Probes: 60
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 (187.156.78.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
187.156.78.x/24/318151rewritten
187.156.78.x/24/308151natblock
187.156.78.x/24/298151natblock
187.156.78.x/24/288151rewritten
187.156.78.x/24/278151rewritten
187.156.78.x/24/268151rewritten
187.156.78.x/24/258151natblock
187.156.78.x/24/248151natblock
187.156.79.x/24/238151natblock
187.156.76.x/24/228151natblock
187.156.74.x/24/218151rewritten
187.156.70.x/24/208151natblock
187.156.94.x/24/198151rewritten
187.156.110.x/24/188151natblock
187.156.14.x/24/178151rewritten
187.156.206.x/24/168151natblock
187.157.78.x/24/15UNROUTEDnatblock
187.158.78.x/24/148151rewritten
187.152.78.x/24/138151rewritten
187.148.78.x/24/128151rewritten
187.140.78.x/24/118151natblock
187.188.78.x/24/1022884rewritten
187.220.78.x/24/98151natblock
187.28.78.x/24/84230rewritten

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 1 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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