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Session Report

Summary:
Test run at: 2024-01-03 05:37:56 GMT
Client Prefix (v4): 203.217.171.x/24
Client AS (v4): 131207 (SINET-KH)
IPv4 Probes: 69
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 (203.217.171.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
203.217.171.x/24/31131207rewritten
203.217.171.x/24/30131207rewritten
203.217.171.x/24/29131207rewritten
203.217.171.x/24/28131207rewritten
203.217.171.x/24/27131207rewritten
203.217.171.x/24/26131207rewritten
203.217.171.x/24/25131207rewritten
203.217.171.x/24/24131207rewritten
203.217.170.x/24/23131207rewritten
203.217.169.x/24/22131207rewritten
203.217.175.x/24/21UNROUTEDrewritten
203.217.163.x/24/20UNROUTEDrewritten
203.217.187.x/24/19131195rewritten
203.217.139.x/24/1817882rewritten
203.217.235.x/24/179764rewritten
203.217.43.x/24/167545rewritten
203.216.171.x/24/1517878rewritten
203.219.171.x/24/147545rewritten
203.221.171.x/24/139942rewritten
203.209.171.x/24/127604rewritten
203.201.171.x/24/1138778rewritten
203.249.171.x/24/1017593rewritten
203.153.171.x/24/97654rewritten
203.89.171.x/24/89889rewritten

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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