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Session Report

Summary:
Test run at: 2024-02-11 09:54:23 GMT
Client Prefix (v4): 145.103.249.x/24
Client AS (v4): 1103 (SURFNET-NL)
IPv4 Probes: 66
Client Prefix (v6): 2a04:8400:xx::/40
Client AS (v6): 207176 (OPENFIBER)
IPv6 Probes: 56
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenreceived
Routable rewrittenreceived
Largest spoofable neighbor prefix length none/16
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 (145.103.249.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
145.103.249.x/24/311103natblock
145.103.249.x/24/301103rewritten
145.103.249.x/24/291103rewritten
145.103.249.x/24/281103rewritten
145.103.249.x/24/271103rewritten
145.103.249.x/24/261103rewritten
145.103.249.x/24/251103rewritten
145.103.249.x/24/241103rewritten
145.103.248.x/24/231103rewritten
145.103.251.x/24/221103rewritten
145.103.253.x/24/211103rewritten
145.103.241.x/24/201103rewritten
145.103.233.x/24/191103rewritten
145.103.217.x/24/181103rewritten
145.103.185.x/24/171103rewritten
145.103.121.x/24/161103rewritten
145.102.249.x/24/151103rewritten
145.101.249.x/24/141103rewritten
145.99.249.x/24/131101rewritten
145.111.249.x/24/12UNROUTEDrewritten
145.119.249.x/24/111136rewritten
145.71.249.x/24/10UNROUTEDrewritten
145.39.249.x/24/91103rewritten
145.231.249.x/24/8UNROUTEDrewritten

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.
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 able to spoof routable, non-adjacent source addresses through the first 1 IP hop(s).
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::242yes
2001:4978:1fb:6400::d22001:48d0:101:501::242yes
2001:49aa:111:aa00::112001:48d0:101:501::242yes
fd11:1111:1111::11112001:48d0:101:501::242yes
2001:48d0:101:501::1592001:48d0:101:501::247yes
2001:4978:1fb:6400::d22001:48d0:101:501::247yes
2001:49aa:111:aa00::112001:48d0:101:501::247yes
fd11:1111:1111::11112001:48d0:101:501::247yes
2001:48d0:101:501::1592001:610:510:115:192:42:115:98yes
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:45a6yes
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:acb4yes
2001:4978:1fb:6400::d22001:770:1c:7:225:90ff:fe0c:acb4yes
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4yes
fd11:1111:1111::11112001:770:1c:7:225:90ff:fe0c:acb4no
2001:48d0:101:501::1592607:8400:2880:4::80df:9d0dyes
2001:4978:1fb:6400::d22607:8400:2880:4::80df:9d0dyes
2001:49aa:111:aa00::112607:8400:2880:4::80df:9d0dyes
fd11:1111:1111::11112607:8400:2880:4::80df:9d0dno
2001:48d0:101:501::1592607:f278:2:13:da3a:ddff:fe30:ce14yes
2001:4978:1fb:6400::d22607:f278:2:13:da3a:ddff:fe30:ce14yes
2001:49aa:111:aa00::112607:f278:2:13:da3a:ddff:fe30:ce14yes
fd11:1111:1111::11112607:f278:2:13:da3a:ddff:fe30:ce14yes
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2a04:8400:xx::/40/120207176yes
2a04:8400:xx::/40/112207176yes
2a04:8400:xx::/40/104207176yes
2a04:8400:xx::/40/96207176yes
2a04:8400:xx::/40/88207176yes
2a04:8400:xx::/40/80207176yes
2a04:8400:xx::/40/72207176yes
2a04:8400:xx::/40/64207176yes
2a04:8400:xx::/40/56207176yes
2a04:8400:xx::/40/48207176yes
2a04:8400:xx::/40/40207176yes
2a04:8400:80xx::/40/32207176yes
2a04:8480:xx::/40/24196714yes
2a04:400:xx::/40/1634254yes

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)
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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