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Session Report

Summary:
Test run at: 2021-04-10 00:22:11 GMT
Client Prefix (v4): 58.249.112.x/24
Client AS (v4): 17622 (CNCGROUP-GZ)
IPv4 Probes: 66
Client Prefix (v6): 2001:250:30xx::/40
Client AS (v6): 23910 (CNGI-CERNET2-AS-AP)
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 (58.249.112.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
58.249.112.x/24/3117622rewritten
58.249.112.x/24/3017622rewritten
58.249.112.x/24/2917622rewritten
58.249.112.x/24/2817622rewritten
58.249.112.x/24/2717622rewritten
58.249.112.x/24/2617622rewritten
58.249.112.x/24/2517622rewritten
58.249.112.x/24/2417622rewritten
58.249.113.x/24/2317622rewritten
58.249.114.x/24/2217622rewritten
58.249.116.x/24/2117622rewritten
58.249.120.x/24/2017622rewritten
58.249.96.x/24/1917622rewritten
58.249.80.x/24/1817622rewritten
58.249.48.x/24/1717622rewritten
58.249.240.x/24/1617816rewritten
58.248.112.x/24/1517622rewritten
58.251.112.x/24/1417623rewritten
58.253.112.x/24/1317816rewritten
58.241.112.x/24/124837rewritten
58.233.112.x/24/119318rewritten
58.217.112.x/24/104134rewritten
58.185.112.x/24/93758rewritten
58.121.112.x/24/89318rewritten

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.

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::242yes
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::247yes
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: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:acb4yes
2001:48d0:101:501::1592001:df0:4:800:21c:c0ff:feb2:ad5fyes
2001:4978:1fb:6400::d22001:df0:4:800:21c:c0ff:feb2:ad5fno
2001:49aa:111:aa00::112001:df0:4:800:21c:c0ff:feb2:ad5fno
fd11:1111:1111::11112001:df0:4:800:21c:c0ff:feb2:ad5fno
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:250:30xx::/40/12023910yes
2001:250:30xx::/40/11223910yes
2001:250:30xx::/40/10423910yes
2001:250:30xx::/40/9623910yes
2001:250:30xx::/40/8823910yes
2001:250:30xx::/40/8023910yes
2001:250:30xx::/40/7223910yes
2001:250:30xx::/40/6423910yes
2001:250:30xx::/40/5623910yes
2001:250:30xx::/40/4823910yes
2001:250:30xx::/40/4023910yes
2001:250:b0xx::/40/3223910yes
2001:2d0:30xx::/40/24UNROUTEDno
2001:8250:30xx::/40/161221yes

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
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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