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Session Report

Summary:
Test run at: 2022-01-13 12:01:11 GMT
Client Prefix (v4): 168.103.157.x/24
Client AS (v4): 209 (CENTURYLINK-US-LEGACY-QWEST)
IPv4 Probes: 63
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 blocked
Routable received
Largest spoofable neighbor prefix length /9
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 (168.103.157.x/24) can spoof 8388607 neighboring addresses (within your /9 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
168.103.157.x/24/31209yes
168.103.157.x/24/30209yes
168.103.157.x/24/29209yes
168.103.157.x/24/28209yes
168.103.157.x/24/27209yes
168.103.157.x/24/26209yes
168.103.157.x/24/25209yes
168.103.157.x/24/24209yes
168.103.156.x/24/23209yes
168.103.159.x/24/22209yes
168.103.153.x/24/21209yes
168.103.149.x/24/20209yes
168.103.141.x/24/19209yes
168.103.189.x/24/18209yes
168.103.221.x/24/17209yes
168.103.29.x/24/16209yes
168.102.157.x/24/15UNROUTEDnatblock
168.101.157.x/24/147417yes
168.99.157.x/24/1310430yes
168.111.157.x/24/1223162yes
168.119.157.x/24/1124940yes
168.71.157.x/24/107018yes
168.39.157.x/24/91761yes
168.231.157.x/24/8UNROUTEDnatblock

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received
yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
natblockSpoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.

IPv4 Outbound Filtering Depth:

The tracefilter test found your host able to spoof routable, non-adjacent source addresses through the first 10 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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