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Session Report

Summary:
Test run at: 2022-05-04 02:24:16 GMT
Client Prefix (v4): 199.77.138.x/24
Client AS (v4): 28007
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 (199.77.138.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
199.77.138.x/24/3128007natblock
199.77.138.x/24/3028007natblock
199.77.138.x/24/2928007rewritten
199.77.138.x/24/2828007rewritten
199.77.138.x/24/2728007rewritten
199.77.138.x/24/2628007rewritten
199.77.138.x/24/2528007rewritten
199.77.138.x/24/2428007rewritten
199.77.139.x/24/2328007rewritten
199.77.136.x/24/223549rewritten
199.77.142.x/24/213549rewritten
199.77.130.x/24/203549rewritten
199.77.154.x/24/193549rewritten
199.77.170.x/24/183549rewritten
199.77.202.x/24/17395088rewritten
199.77.10.x/24/163549rewritten
199.76.138.x/24/153356rewritten
199.79.138.x/24/14UNROUTEDrewritten
199.73.138.x/24/13UNROUTEDrewritten
199.69.138.x/24/127018rewritten
199.93.138.x/24/113356rewritten
199.109.138.x/24/10UNROUTEDrewritten
199.13.138.x/24/9UNROUTEDrewritten
199.205.138.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 2 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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