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Session Report

Summary:
Test run at: 2022-07-21 09:21:58 GMT
Client Prefix (v4): 121.58.186.x/24
Client AS (v4): 38896 (CERGIS-AS-AP)
IPv4 Probes: 60
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable received
Largest spoofable neighbor prefix length /8
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 (121.58.186.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
121.58.186.x/24/3138896natblock
121.58.186.x/24/3038896yes
121.58.186.x/24/2938896yes
121.58.186.x/24/2838896yes
121.58.186.x/24/2738896yes
121.58.186.x/24/2638896yes
121.58.186.x/24/2538896yes
121.58.186.x/24/2438896yes
121.58.187.x/24/2338896yes
121.58.184.x/24/2238896yes
121.58.190.x/24/2138896yes
121.58.178.x/24/207670yes
121.58.170.x/24/19UNROUTEDnatblock
121.58.154.x/24/18UNROUTEDnatblock
121.58.250.x/24/1717639yes
121.58.58.x/24/164134yes
121.59.186.x/24/15UNROUTEDnatblock
121.56.186.x/24/144134yes
121.62.186.x/24/134134yes
121.50.186.x/24/1218046yes
121.42.186.x/24/1137963yes
121.26.186.x/24/104837yes
121.122.186.x/24/99534yes
121.186.186.x/24/84766yes

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)
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 able to spoof routable, non-adjacent source addresses through the first 10 IP hop(s).
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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