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Session Report

Summary:
Test run at: 2023-06-20 12:11:50 GMT
Client Prefix (v4): 210.39.1.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 60
Client Prefix (v6): 2001:da8:2dxx::/40
Client AS (v6): 138369 (CNGI-SZH-IX-AS-AP)
IPv6 Probes: 52
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedblocked
Routable blockedreceived
Largest spoofable neighbor prefix length /20/16
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.
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 (210.39.1.x/24) can spoof 4095 neighboring addresses (within your /20 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
210.39.1.x/24/314538yes
210.39.1.x/24/304538yes
210.39.1.x/24/294538yes
210.39.1.x/24/284538yes
210.39.1.x/24/274538yes
210.39.1.x/24/264538yes
210.39.1.x/24/254538yes
210.39.1.x/24/244538yes
210.39.0.x/24/234538yes
210.39.3.x/24/224538yes
210.39.5.x/24/214538yes
210.39.9.x/24/204538yes
210.39.17.x/24/194538natblock
210.39.33.x/24/184538natblock
210.39.65.x/24/1724357natblock
210.39.129.x/24/1624357natblock
210.38.1.x/24/1524357natblock
210.37.1.x/24/144538natblock
210.35.1.x/24/134538natblock
210.47.1.x/24/124538natblock
210.55.1.x/24/114648natblock
210.7.1.x/24/104638natblock
210.103.1.x/24/94766natblock
210.167.1.x/24/87668natblock

Meaning of status in Received column:

yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)
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::1592001:40b0:7500:280::5458:517ayes
2001:4978:1fb:6400::d22001:40b0:7500:280::5458:517ayes
2001:49aa:111:aa00::112001:40b0:7500:280::5458:517ayes
fd11:1111:1111::11112001:40b0:7500:280::5458:517ano
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::1592001:610:510:115:192:42:115:98yes
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:45a6yes
2001:49aa:111:aa00::112001:630:212:225:225:90ff:fe0c:45a6yes
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
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:da8:2dxx::/40/120138369yes
2001:da8:2dxx::/40/112138369yes
2001:da8:2dxx::/40/104138369yes
2001:da8:2dxx::/40/96138369yes
2001:da8:2dxx::/40/88138369yes
2001:da8:2dxx::/40/80138369yes
2001:da8:2dxx::/40/72138369yes
2001:da8:2dxx::/40/64138369yes
2001:da8:2dxx::/40/56138369yes
2001:da8:2dxx::/40/48138369yes
2001:da8:2dxx::/40/4023910yes
2001:da8:adxx::/40/3223910yes
2001:d28:2dxx::/40/249621yes
2001:8da8:2dxx::/40/161221yes

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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