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Session Report

Summary:
Test run at: 2022-01-21 17:34:06 GMT
Client Prefix (v4): 99.17.208.x/24
Client AS (v4): 7018 (ATT-INTERNET4)
IPv4 Probes: 63
Client Prefix (v6): 2600:1700:a0xx::/40
Client AS (v6): 7018 (ATT-INTERNET4)
IPv6 Probes: 52
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenblocked
Routable rewrittenblocked
Largest spoofable neighbor prefix length nonenone
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 (99.17.208.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
99.17.208.x/24/317018sendto
99.17.208.x/24/307018sendto
99.17.208.x/24/297018sendto
99.17.208.x/24/287018sendto
99.17.208.x/24/277018sendto
99.17.208.x/24/267018sendto
99.17.208.x/24/257018sendto
99.17.208.x/24/247018sendto
99.17.209.x/24/237018sendto
99.17.210.x/24/227018sendto
99.17.212.x/24/217018rewritten
99.17.216.x/24/207018sendto
99.17.192.x/24/197018sendto
99.17.240.x/24/187018sendto
99.17.144.x/24/177018sendto
99.17.80.x/24/167018sendto
99.16.208.x/24/157018sendto
99.19.208.x/24/147018sendto
99.21.208.x/24/137018sendto
99.25.208.x/24/127018sendto
99.1.208.x/24/117018rewritten
99.49.208.x/24/107018sendto
99.81.208.x/24/916509sendto
99.145.208.x/24/87018sendto

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.
IPv6 probes:
Spoofed source addressDestinationReceived
2001:48d0:101:501::1592001:48d0:101:501::242no
2001:4978:1fb:6400::d22001:48d0:101:501::242no
2001:49aa:111:aa00::112001:48d0:101:501::242no
fd11:1111:1111::11112001:48d0:101:501::242no
2001:48d0:101:501::1592001:48d0:101:501::247no
2001:4978:1fb:6400::d22001:48d0:101:501::247no
2001:49aa:111:aa00::112001:48d0:101:501::247no
fd11:1111:1111::11112001:48d0:101:501::247no
2001:48d0:101:501::1592001:630:212:225:225:90ff:fe0c:45a6no
2001:4978:1fb:6400::d22001:630:212:225:225:90ff:fe0c:45a6no
2001:49aa:111:aa00::112001:630:212:225:225:90ff:fe0c:45a6no
fd11:1111:1111::11112001:630:212:225:225:90ff:fe0c:45a6no
2001:48d0:101:501::1592001:770:1c:7:225:90ff:fe0c:acb4no
2001:4978:1fb:6400::d22001:770:1c:7:225:90ff:fe0c:acb4no
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4no
fd11:1111:1111::11112001:770:1c:7:225:90ff:fe0c:acb4no
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2600:1700:a0xx::/40/1207018no
2600:1700:a0xx::/40/1127018sendto
2600:1700:a0xx::/40/1047018no
2600:1700:a0xx::/40/967018no
2600:1700:a0xx::/40/887018no
2600:1700:a0xx::/40/807018no
2600:1700:a0xx::/40/727018no
2600:1700:a0xx::/40/647018no
2600:1700:a0xx::/40/567018no
2600:1700:a0xx::/40/487018no
2600:1700:a0xx::/40/407018no
2600:1700:20xx::/40/327018no
2600:1780:a0xx::/40/24UNROUTEDno
2600:9700:a0xx::/40/16UNROUTEDno

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
sendtoThe spoofer client was unable to send spoofed headers due to an operating system restriction.
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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