Logo

Session Report

Summary:
Test run at: 2021-11-19 01:27:46 GMT
Client Prefix (v4): 202.120.235.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 66
Client Prefix (v6): 2001:da8:80xx::/40
Client AS (v6): 24365 (CNGI-SH-IX2-AS-AP)
IPv6 Probes: 56
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 /24/104
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 (202.120.235.x/24) can spoof 255 neighboring addresses (within your /24 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
202.120.235.x/24/314538yes
202.120.235.x/24/304538yes
202.120.235.x/24/294538yes
202.120.235.x/24/284538yes
202.120.235.x/24/274538yes
202.120.235.x/24/264538yes
202.120.235.x/24/254538yes
202.120.235.x/24/244538yes
202.120.234.x/24/234538natblock
202.120.233.x/24/224538natblock
202.120.239.x/24/214538natblock
202.120.227.x/24/204538natblock
202.120.251.x/24/194538natblock
202.120.203.x/24/184538natblock
202.120.171.x/24/174538natblock
202.120.107.x/24/164538natblock
202.121.235.x/24/154538natblock
202.122.235.x/24/149622natblock
202.124.235.x/24/1317893natblock
202.112.235.x/24/124538natblock
202.104.235.x/24/114134natblock
202.88.235.x/24/1017465natblock
202.56.235.x/24/99498natblock
202.248.235.x/24/82510natblock

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::1592001:48d0:101:501::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:45a6no
2001:4978:1fb:6400::d22001:630:212:225:225:90ff:fe0c:45a6no
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:acb4no
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:da8:80xx::/40/12024365yes
2001:da8:80xx::/40/11224365yes
2001:da8:80xx::/40/10424365yes
2001:da8:80xx::/40/9624365no
2001:da8:80xx::/40/8824365no
2001:da8:80xx::/40/8024365no
2001:da8:80xx::/40/7224365no
2001:da8:80xx::/40/6424365no
2001:da8:80xx::/40/5624365no
2001:da8:80xx::/40/4824365no
2001:da8:80xx::/40/4023910no
2001:da8:xx::/40/3223910no
2001:d28:80xx::/40/249621no
2001:8da8:80xx::/40/161221no

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.
Last Modified