Session Report

Summary:

Test run at: 2023-07-10 16:39:45 GMT
Client Prefix (v4): 31.161.229.x/24
Client AS (v4): 1136 (KPN)
IPv4 Probes: 60
Client Prefix (v6): 2a02:a420:xx::/40
Client AS (v6): 1136 (KPN)
IPv6 Probes: 52

Outbound spoofing summary (from the client to our server)
Source address type	IPv4		IPv6
Private - RFC1918 or ULA	blocked		blocked
Routable	received		blocked
Largest spoofable neighbor prefix length	/8		/64

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:

• ⚠️ Your host is behind a Network Address Translation (NAT) router or firewall but spoofed packets are still being received without modification. See here for more information.

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 (31.161.229.x/24) can spoof 16777215 neighboring addresses (within your /8 prefix)

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
31.161.229.x/24	/31	1136	natblock
31.161.229.x/24	/30	1136	yes
31.161.229.x/24	/29	1136	yes
31.161.229.x/24	/28	1136	yes
31.161.229.x/24	/27	1136	natblock
31.161.229.x/24	/26	1136	natblock
31.161.229.x/24	/25	1136	yes
31.161.229.x/24	/24	1136	yes
31.161.228.x/24	/23	1136	yes
31.161.231.x/24	/22	1136	natblock
31.161.225.x/24	/21	1136	yes
31.161.237.x/24	/20	1136	yes
31.161.245.x/24	/19	1136	natblock
31.161.197.x/24	/18	1136	yes
31.161.165.x/24	/17	1136	yes
31.161.101.x/24	/16	1136	natblock
31.160.229.x/24	/15	1136	natblock
31.163.229.x/24	/14	12389	yes
31.165.229.x/24	/13	6730	yes
31.169.229.x/24	/12	16019	yes
31.177.229.x/24	/11	UNROUTED	natblock
31.129.229.x/24	/10	UNROUTED	natblock
31.225.229.x/24	/9	3320	yes
31.33.229.x/24	/8	5410	yes

Meaning of status in Received column:

yes	Packets spoofed from adjacent netblock were received
yes	Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
natblock	Spoofed 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).

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 address	Destination	Received
2001:48d0:101:501::159	2001:40b0:7500:280::5458:517a	no
2001:4978:1fb:6400::d2	2001:40b0:7500:280::5458:517a	no
2001:49aa:111:aa00::11	2001:40b0:7500:280::5458:517a	no
fd11:1111:1111::1111	2001:40b0:7500:280::5458:517a	no
2001:48d0:101:501::159	2001:48d0:101:501::242	no
2001:4978:1fb:6400::d2	2001:48d0:101:501::242	no
2001:49aa:111:aa00::11	2001:48d0:101:501::242	no
fd11:1111:1111::1111	2001:48d0:101:501::242	no
2001:48d0:101:501::159	2001:48d0:101:501::247	no
2001:4978:1fb:6400::d2	2001:48d0:101:501::247	no
2001:49aa:111:aa00::11	2001:48d0:101:501::247	no
fd11:1111:1111::1111	2001:48d0:101:501::247	no
2001:48d0:101:501::159	2001:610:510:115:192:42:115:98	no
2001:4978:1fb:6400::d2	2001:610:510:115:192:42:115:98	no
2001:49aa:111:aa00::11	2001:610:510:115:192:42:115:98	no
fd11:1111:1111::1111	2001:610:510:115:192:42:115:98	no
2001:48d0:101:501::159	2001:630:212:225:225:90ff:fe0c:45a6	no
2001:4978:1fb:6400::d2	2001:630:212:225:225:90ff:fe0c:45a6	no
2001:49aa:111:aa00::11	2001:630:212:225:225:90ff:fe0c:45a6	no
fd11:1111:1111::1111	2001:630:212:225:225:90ff:fe0c:45a6	no
2001:48d0:101:501::159	2001:770:1c:7:225:90ff:fe0c:acb4	no
2001:4978:1fb:6400::d2	2001:770:1c:7:225:90ff:fe0c:acb4	no
2001:49aa:111:aa00::11	2001:770:1c:7:225:90ff:fe0c:acb4	no
fd11:1111:1111::1111	2001:770:1c:7:225:90ff:fe0c:acb4	no

IPv6 Adjacent Netblock Testing:

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
2a02:a420:xx::/40	/120	1136	no
2a02:a420:xx::/40	/112	1136	yes
2a02:a420:xx::/40	/104	1136	yes
2a02:a420:xx::/40	/96	1136	yes
2a02:a420:xx::/40	/88	1136	yes
2a02:a420:xx::/40	/80	1136	yes
2a02:a420:xx::/40	/72	1136	yes
2a02:a420:xx::/40	/64	1136	yes
2a02:a420:xx::/40	/56	1136	no
2a02:a420:xx::/40	/48	1136	no
2a02:a420:xx::/40	/40	1136	no
2a02:a420:80xx::/40	/32	1136	no
2a02:a4a0:xx::/40	/24	UNROUTED	no
2a02:2420:xx::/40	/16	197075	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 (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:

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