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Session Report

Summary:
Test run at: 2020-09-02 15:42:33 GMT
Client Prefix (v4): 154.57.3.x/24
Client AS (v4): 174 (COGENT-174)
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 none
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 (154.57.3.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
154.57.3.x/24/31174rewritten
154.57.3.x/24/30174rewritten
154.57.3.x/24/29174rewritten
154.57.3.x/24/28174rewritten
154.57.3.x/24/27174rewritten
154.57.3.x/24/26174natblock
154.57.3.x/24/25174rewritten
154.57.3.x/24/24174rewritten
154.57.2.x/24/23174rewritten
154.57.1.x/24/22174rewritten
154.57.7.x/24/21200736rewritten
154.57.11.x/24/20200736rewritten
154.57.19.x/24/19174rewritten
154.57.35.x/24/18174rewritten
154.57.67.x/24/17174rewritten
154.57.131.x/24/16174rewritten
154.56.3.x/24/15174rewritten
154.59.3.x/24/14174rewritten
154.61.3.x/24/13174rewritten
154.49.3.x/24/12174rewritten
154.41.3.x/24/1150115rewritten
154.25.3.x/24/10174rewritten
154.121.3.x/24/9327712rewritten
154.185.3.x/24/88452rewritten

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.
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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