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Session Report

Summary:
Test run at: 2023-01-30 19:00:31 GMT
Client Prefix (v4): 100.8.239.x/24
Client AS (v4): 701 (UUNET)
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 (100.8.239.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
100.8.239.x/24/31701rewritten
100.8.239.x/24/30701sendto
100.8.239.x/24/29701sendto
100.8.239.x/24/28701sendto
100.8.239.x/24/27701rewritten
100.8.239.x/24/26701sendto
100.8.239.x/24/25701rewritten
100.8.239.x/24/24701sendto
100.8.238.x/24/23701sendto
100.8.237.x/24/22701rewritten
100.8.235.x/24/21701rewritten
100.8.231.x/24/20701sendto
100.8.255.x/24/19701rewritten
100.8.207.x/24/18701sendto
100.8.175.x/24/17701sendto
100.8.111.x/24/16701sendto
100.9.239.x/24/155650sendto
100.10.239.x/24/14701sendto
100.12.239.x/24/13701rewritten
100.0.239.x/24/12701rewritten
100.24.239.x/24/1114618rewritten
100.40.239.x/24/10701rewritten
100.72.239.x/24/9UNROUTEDrewritten
100.136.239.x/24/821928sendto

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.
sendtoThe spoofer client was unable to send spoofed headers due to an operating system restriction.

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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