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Session Report

Summary:
Test run at: 2020-08-20 03:54:15 GMT
Client Prefix (v4): 217.138.221.x/24
Client AS (v4): 9009 (M247)
IPv4 Probes: 75
Client Prefix (v6): 2001:ac8:xx::/40
Client AS (v6): 9009 (M247)
IPv6 Probes: 68
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA unknownunknown
Routable unknownunknown
Largest spoofable neighbor prefix length nonenone
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 (217.138.221.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
217.138.221.x/24/319009natblock
217.138.221.x/24/309009natblock
217.138.221.x/24/299009natblock
217.138.221.x/24/289009natblock
217.138.221.x/24/279009natblock
217.138.221.x/24/269009natblock
217.138.221.x/24/259009natblock
217.138.221.x/24/249009natblock
217.138.220.x/24/239009natblock
217.138.223.x/24/22UNROUTEDnatblock
217.138.217.x/24/219009natblock
217.138.213.x/24/209009natblock
217.138.205.x/24/199009natblock
217.138.253.x/24/189009natblock
217.138.157.x/24/1720952natblock
217.138.93.x/24/1620952natblock
217.139.221.x/24/1520928natblock
217.136.221.x/24/145432natblock
217.142.221.x/24/1316253natblock
217.130.221.x/24/1212430natblock
217.154.221.x/24/118897natblock
217.170.221.x/24/108905natblock
217.202.221.x/24/916232natblock
217.10.221.x/24/812302natblock

Meaning of status in Received column:

natblockSpoofed 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 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:ac8:xx::/40/1209009natblock
2001:ac8:xx::/40/1129009natblock
2001:ac8:xx::/40/1049009natblock
2001:ac8:xx::/40/969009natblock
2001:ac8:xx::/40/889009natblock
2001:ac8:xx::/40/809009natblock
2001:ac8:xx::/40/729009natblock
2001:ac8:xx::/40/649009natblock
2001:ac8:xx::/40/569009natblock
2001:ac8:xx::/40/489009natblock
2001:ac8:xx::/40/409009natblock
2001:ac8:80xx::/40/329009natblock
2001:a48:xx::/40/248970natblock
2001:8ac8:xx::/40/161221natblock

Meaning of status in Received column:

natblockSpoofed probe packets appear to be blocked by your local NAT or firewall rather than being rewritten with a public source address.
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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