Session Report

Summary:

Test run at: 2025-03-03 03:30:21 GMT
Client Prefix (v4): 194.195.89.x/24
Client AS (v4): 137409 (GSLNETWORKS-AS-AP)
IPv4 Probes: 162
Client Prefix (v6): 2401:2d60:xx::/40
Client AS (v6): 150369
IPv6 Probes: 56

Outbound spoofing summary (from the client to our server)
Source address type	IPv4		IPv6
Private - RFC1918 or ULA	unknown		received
Routable	unknown		received
Largest spoofable neighbor prefix length	none		/16

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 (194.195.89.x/24) can spoof 0 neighboring addresses

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
194.195.89.x/24	/31	137409	natblock
194.195.89.x/24	/30	137409	natblock
194.195.89.x/24	/29	137409	natblock
194.195.89.x/24	/28	137409	natblock
194.195.89.x/24	/27	137409	natblock
194.195.89.x/24	/26	137409	natblock
194.195.89.x/24	/25	137409	natblock
194.195.89.x/24	/24	137409	natblock
194.195.88.x/24	/23	136787	natblock
194.195.91.x/24	/22	206092	natblock
194.195.93.x/24	/21	136787	natblock
194.195.81.x/24	/20	204170	natblock
194.195.73.x/24	/19	61157	natblock
194.195.121.x/24	/18	63949	natblock
194.195.25.x/24	/17	21700	natblock
194.195.217.x/24	/16	63949	natblock
194.194.89.x/24	/15	2686	natblock
194.193.89.x/24	/14	138384	natblock
194.199.89.x/24	/13	2200	natblock
194.203.89.x/24	/12	702	natblock
194.211.89.x/24	/11	719	natblock
194.227.89.x/24	/10	UNROUTED	natblock
194.131.89.x/24	/9	702	natblock
194.67.89.x/24	/8	197695	natblock

Meaning of status in Received column:

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 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 address	Destination	Received
2001:48d0:101:501::159	2001:48d0:101:501::242	yes
2001:4978:1fb:6400::d2	2001:48d0:101:501::242	yes
2001:49aa:111:aa00::11	2001:48d0:101:501::242	yes
fd11:1111:1111::1111	2001:48d0:101:501::242	yes
2001:48d0:101:501::159	2001:48d0:101:501::247	yes
2001:4978:1fb:6400::d2	2001:48d0:101:501::247	yes
2001:49aa:111:aa00::11	2001:48d0:101:501::247	yes
fd11:1111:1111::1111	2001:48d0:101:501::247	yes
2001:48d0:101:501::159	2001:770:1c:7:225:90ff:fe0c:acb4	yes
2001:4978:1fb:6400::d2	2001:770:1c:7:225:90ff:fe0c:acb4	yes
2001:49aa:111:aa00::11	2001:770:1c:7:225:90ff:fe0c:acb4	yes
fd11:1111:1111::1111	2001:770:1c:7:225:90ff:fe0c:acb4	no
2001:48d0:101:501::159	2607:8400:2880:4::80df:9d0d	yes
2001:4978:1fb:6400::d2	2607:8400:2880:4::80df:9d0d	yes
2001:49aa:111:aa00::11	2607:8400:2880:4::80df:9d0d	yes
fd11:1111:1111::1111	2607:8400:2880:4::80df:9d0d	no
2001:48d0:101:501::159	2607:f278:2:13:da3a:ddff:fe30:ce14	yes
2001:4978:1fb:6400::d2	2607:f278:2:13:da3a:ddff:fe30:ce14	yes
2001:49aa:111:aa00::11	2607:f278:2:13:da3a:ddff:fe30:ce14	yes
fd11:1111:1111::1111	2607:f278:2:13:da3a:ddff:fe30:ce14	yes

IPv6 Adjacent Netblock Testing:

Spoofed source address (anon)	Prefix Length	ASN of spoofed source address	Received
2401:2d60:xx::/40	/120	150369	yes
2401:2d60:xx::/40	/112	150369	yes
2401:2d60:xx::/40	/104	150369	yes
2401:2d60:xx::/40	/96	150369	yes
2401:2d60:xx::/40	/88	150369	yes
2401:2d60:xx::/40	/80	150369	yes
2401:2d60:xx::/40	/72	150369	yes
2401:2d60:xx::/40	/64	150369	yes
2401:2d60:xx::/40	/56	150369	yes
2401:2d60:xx::/40	/48	150369	yes
2401:2d60:xx::/40	/40	150369	yes
2401:2d60:80xx::/40	/32	150369	yes
2401:2de0:xx::/40	/24	UNROUTED	yes
2401:ad60:xx::/40	/16	UNROUTED	yes

Meaning of status in Received column:

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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