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Session Report

Summary:
Test run at: 2022-05-27 09:23:52 GMT
Client Prefix (v4): 213.127.120.x/24
Client AS (v4): 33915 (TNF-AS)
IPv4 Probes: 60
Client Prefix (v6): 2a02:a210:cxx::/40
Client AS (v6): 33915 (TNF-AS)
IPv6 Probes: 56
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedblocked
Routable blockedblocked
Largest spoofable neighbor prefix length none/80
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.
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 (213.127.120.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
213.127.120.x/24/3133915natblock
213.127.120.x/24/3033915natblock
213.127.120.x/24/2933915natblock
213.127.120.x/24/2833915natblock
213.127.120.x/24/2733915natblock
213.127.120.x/24/2633915natblock
213.127.120.x/24/2533915natblock
213.127.120.x/24/2433915natblock
213.127.121.x/24/2333915natblock
213.127.122.x/24/2233915natblock
213.127.124.x/24/2133915natblock
213.127.112.x/24/2033915natblock
213.127.104.x/24/1933915natblock
213.127.88.x/24/1833915natblock
213.127.56.x/24/1733915natblock
213.127.248.x/24/1633915natblock
213.126.120.x/24/1533915natblock
213.125.120.x/24/1433915natblock
213.123.120.x/24/132856natblock
213.119.120.x/24/126848natblock
213.111.120.x/24/1148683natblock
213.95.120.x/24/1012337natblock
213.63.120.x/24/912926natblock
213.255.120.x/24/88968natblock

Meaning of status in Received column:

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 unable to spoof routable, non-adjacent source addresses through even the first IP hop.
IPv6 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.

  

  
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::1592001:610:510:115:192:42:115:98no
2001:4978:1fb:6400::d22001:610:510:115:192:42:115:98no
2001:49aa:111:aa00::112001:610:510:115:192:42:115:98no
fd11:1111:1111::11112001:610:510:115:192:42:115:98no
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
2a02:a210:cxx::/40/12033915yes
2a02:a210:cxx::/40/11233915yes
2a02:a210:cxx::/40/10433915no
2a02:a210:cxx::/40/9633915no
2a02:a210:cxx::/40/8833915no
2a02:a210:cxx::/40/8033915yes
2a02:a210:cxx::/40/7233915no
2a02:a210:cxx::/40/6433915no
2a02:a210:cxx::/40/5633915no
2a02:a210:cxx::/40/4833915no
2a02:a210:cxx::/40/4033915no
2a02:a210:8cxx::/40/3233915no
2a02:a290:cxx::/40/24UNROUTEDno
2a02:2210:cxx::/40/16UNROUTEDrewritten

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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.
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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