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Session Report

Summary:
Test run at: 2022-01-04 21:25:52 GMT
Client Prefix (v4): 124.41.83.x/24
Client AS (v4): 2497 (IIJ)
IPv4 Probes: 63
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable rewritten
Largest spoofable neighbor prefix length none

Meaning of result status in column:

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 (124.41.83.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
124.41.83.x/24/312497rewritten
124.41.83.x/24/302497rewritten
124.41.83.x/24/292497rewritten
124.41.83.x/24/282497rewritten
124.41.83.x/24/272497rewritten
124.41.83.x/24/262497rewritten
124.41.83.x/24/252497rewritten
124.41.83.x/24/242497rewritten
124.41.82.x/24/232497rewritten
124.41.81.x/24/222497rewritten
124.41.87.x/24/212497rewritten
124.41.91.x/24/202497rewritten
124.41.67.x/24/192497rewritten
124.41.115.x/24/182497rewritten
124.41.19.x/24/172497rewritten
124.41.211.x/24/1617501rewritten
124.40.83.x/24/159351rewritten
124.43.83.x/24/149329rewritten
124.45.83.x/24/139595rewritten
124.33.83.x/24/1217506rewritten
124.57.83.x/24/1117858rewritten
124.9.83.x/24/109924rewritten
124.105.83.x/24/99299rewritten
124.169.83.x/24/87545rewritten

Meaning of status in Received column:

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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