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Session Report

Summary:
Test run at: 2022-03-14 04:40:12 GMT
Client Prefix (v4): 183.172.70.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 60
Client Prefix (v6): 2402:f000:xx::/40
Client AS (v6): 45576 (CERNET2-TSINGHUA6-AS-AP)
IPv6 Probes: 56
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenblocked
Routable rewrittenreceived
Largest spoofable neighbor prefix length none/32
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 (183.172.70.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
183.172.70.x/24/314538rewritten
183.172.70.x/24/304538rewritten
183.172.70.x/24/294538rewritten
183.172.70.x/24/284538rewritten
183.172.70.x/24/274538rewritten
183.172.70.x/24/264538rewritten
183.172.70.x/24/254538rewritten
183.172.70.x/24/244538rewritten
183.172.71.x/24/234538rewritten
183.172.68.x/24/224538rewritten
183.172.66.x/24/214538rewritten
183.172.78.x/24/204538rewritten
183.172.86.x/24/194538rewritten
183.172.102.x/24/184538rewritten
183.172.6.x/24/174538rewritten
183.172.198.x/24/164538rewritten
183.173.70.x/24/154538rewritten
183.174.70.x/24/144538rewritten
183.168.70.x/24/134538rewritten
183.164.70.x/24/124134rewritten
183.188.70.x/24/114837rewritten
183.140.70.x/24/104134rewritten
183.236.70.x/24/956040rewritten
183.44.70.x/24/84134rewritten

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::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:45a6yes
2001:4978:1fb:6400::d22001:630:212:225:225:90ff:fe0c:45a6yes
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:acb4no
2001:49aa:111:aa00::112001:770:1c:7:225:90ff:fe0c:acb4yes
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
2402:f000:xx::/40/12045576no
2402:f000:xx::/40/11245576no
2402:f000:xx::/40/10445576no
2402:f000:xx::/40/9645576yes
2402:f000:xx::/40/8845576no
2402:f000:xx::/40/8045576no
2402:f000:xx::/40/7245576no
2402:f000:xx::/40/6445576no
2402:f000:xx::/40/5645576no
2402:f000:xx::/40/4845576no
2402:f000:xx::/40/4045576yes
2402:f000:80xx::/40/3245576yes
2402:f080:xx::/40/2438150no
2402:7000:xx::/40/16UNROUTEDno

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)
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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