Session Report

Summary:

Test run at: 2020-01-13 11:15:04 GMT
Client Prefix (v4): 183.172.64.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 75
Client Prefix (v6): 2402:f000:xx::/40
Client AS (v6): 45576 (CERNET2-TSINGHUA6-AS-AP)

Outbound spoofing summary (from the client to our server)
Source address type	IPv4
Private - RFC1918	blocked
Routable	blocked
Largest spoofable neighbor prefix length	none

Spoof status key
received		Spoofed packet was received.	✔	Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it.
rewritten		Spoofed packet was received, but the source address was changed en route.
blocked		Spoofed packet was not received, but unspoofed packet was.
unknown		Neither 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 (183.172.64.x/24) can spoof 0 neighboring addresses

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
183.172.64.x/24	/31	4538	sendto
183.172.64.x/24	/30	4538	sendto
183.172.64.x/24	/29	4538	sendto
183.172.64.x/24	/28	4538	no
183.172.64.x/24	/27	4538	no
183.172.64.x/24	/26	4538	sendto
183.172.64.x/24	/25	4538	sendto
183.172.64.x/24	/24	4538	sendto
183.172.65.x/24	/23	4538	no
183.172.66.x/24	/22	4538	no
183.172.68.x/24	/21	4538	no
183.172.72.x/24	/20	4538	sendto
183.172.80.x/24	/19	4538	no
183.172.96.x/24	/18	4538	sendto
183.172.0.x/24	/17	4538	sendto
183.172.192.x/24	/16	4538	no
183.173.64.x/24	/15	24348	no
183.174.64.x/24	/14	4538	no
183.168.64.x/24	/13	4538	no
183.164.64.x/24	/12	4134	sendto
183.188.64.x/24	/11	4837	sendto
183.140.64.x/24	/10	4134	sendto
183.236.64.x/24	/9	56040	no
183.44.64.x/24	/8	4134	sendto

Meaning of status in Received column:

no	Packets spoofed from adjacent netblock were not received, probably due to blocking
sendto	The spoofer client was unable to send spoofed headers due to an operating system restriction.

IPv4 Outbound Filtering Depth:

The tracefilter test found your host unable to spoof routable, non-adjacent source addresses through even the first IP hop.

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.