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Session Report

Summary:
Test run at: 2020-02-12 15:51:28 GMT
Client Prefix (v4): 131.0.60.x/24
Client AS (v4): 61704
IPv4 Probes: 75
Outbound spoofing summary (from the client to our server)
Source address type IPv4
Private - RFC1918 rewritten
Routable received
Largest spoofable neighbor prefix length /22
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 Adjacent Netblock Testing:

Your host (131.0.60.x/24) can spoof 1023 neighboring addresses (within your /22 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
131.0.60.x/24/3161704natblock
131.0.60.x/24/3061704natblock
131.0.60.x/24/2961704yes
131.0.60.x/24/2861704yes
131.0.60.x/24/2761704yes
131.0.60.x/24/2661704yes
131.0.60.x/24/2561704yes
131.0.60.x/24/2461704yes
131.0.61.x/24/2361704yes
131.0.62.x/24/2261704yes
131.0.56.x/24/2161874rewritten
131.0.52.x/24/203549rewritten
131.0.44.x/24/19262621rewritten
131.0.28.x/24/1828210rewritten
131.0.124.x/24/17UNROUTEDrewritten
131.0.188.x/24/1661708rewritten
131.1.60.x/24/153269rewritten
131.2.60.x/24/14UNROUTEDrewritten
131.4.60.x/24/13721rewritten
131.8.60.x/24/12UNROUTEDrewritten
131.16.60.x/24/11721rewritten
131.32.60.x/24/10385rewritten
131.64.60.x/24/927064rewritten
131.128.60.x/24/814348rewritten

Meaning of status in Received column:

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.
rewrittenThe source address of the probe packets we received differs from the spoofed address. It appears that an intermediate device is rewriting your packet headers.

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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