Session Report

Summary:

Test run at: 2019-11-13 06:01:46 GMT
Client Prefix (v4): 202.13.71.x/24
Client AS (v4): 2515 (JPNIC)
IPv4 Probes: 75

Outbound spoofing summary (from the client to our server)
Source address type	IPv4
Private - RFC1918	blocked
Routable	received
Largest spoofable neighbor prefix length	/11

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.

Warnings:

• ⚠️ This client appears to be multihomed and although its (IPv4) origin AS is 2515, our data suggest that only AS 7521 is allowing spoofed packets through.

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 (202.13.71.x/24) can spoof 2097151 neighboring addresses (within your /11 prefix)

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
202.13.71.x/24	/31	2515	yes
202.13.71.x/24	/30	2515	yes
202.13.71.x/24	/29	2515	yes
202.13.71.x/24	/28	2515	yes
202.13.71.x/24	/27	2515	yes
202.13.71.x/24	/26	2515	yes
202.13.71.x/24	/25	2515	yes
202.13.71.x/24	/24	2515	yes
202.13.70.x/24	/23	2515	yes
202.13.69.x/24	/22	2515	yes
202.13.67.x/24	/21	2515	yes
202.13.79.x/24	/20	UNROUTED	no
202.13.87.x/24	/19	2907	yes
202.13.103.x/24	/18	UNROUTED	no
202.13.7.x/24	/17	UNROUTED	no
202.13.199.x/24	/16	2505	yes
202.12.71.x/24	/15	9297	yes
202.15.71.x/24	/14	7687	yes
202.9.71.x/24	/13	UNROUTED	no
202.5.71.x/24	/12	17707	yes
202.29.71.x/24	/11	4621	yes
202.45.71.x/24	/10	UNROUTED	no
202.77.71.x/24	/9	UNROUTED	no
202.141.71.x/24	/8	UNROUTED	no

Meaning of status in Received column:

no	Packets spoofed from adjacent netblock were not received, probably due to blocking
yes	Packets spoofed from adjacent netblock were received
yes	Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)

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:

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