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Session Report

Summary:
Test run at: 2018-04-27 17:21:53 GMT
Client Prefix (v4): 38.97.90.x/24
Client AS (v4): 174 (COGENT-174)
IPv4 Probes: 99
Client Prefix (v6): 2001:558:14xx::/40
Client AS (v6): 7922 (COMCAST-7922)
IPv6 Probes: 65
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenunknown
Routable rewrittenunknown
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 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 (38.97.90.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
38.97.90.x/24/31174rewritten
38.97.90.x/24/30174rewritten
38.97.90.x/24/29174rewritten
38.97.90.x/24/28174rewritten
38.97.90.x/24/27174rewritten
38.97.90.x/24/26174rewritten
38.97.90.x/24/25174rewritten
38.97.90.x/24/24174rewritten
38.97.91.x/24/2329786rewritten
38.97.88.x/24/2236271rewritten
38.97.94.x/24/21174rewritten
38.97.82.x/24/20174rewritten
38.97.74.x/24/19174rewritten
38.97.122.x/24/18174rewritten
38.97.26.x/24/17174rewritten
38.97.218.x/24/1654744rewritten
38.96.90.x/24/15174rewritten
38.99.90.x/24/14174rewritten
38.101.90.x/24/13174rewritten
38.105.90.x/24/12174rewritten
38.113.90.x/24/11174rewritten
38.65.90.x/24/1032098rewritten
38.33.90.x/24/9174rewritten
38.225.90.x/24/8174rewritten

Meaning of status in Received column:

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 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
2001:558:14xx::/40/1207922no
2001:558:14xx::/40/1127922no
2001:558:14xx::/40/1047922no
2001:558:14xx::/40/967922no
2001:558:14xx::/40/887922no
2001:558:14xx::/40/807922no
2001:558:14xx::/40/727922no
2001:558:14xx::/40/647922no
2001:558:14xx::/40/567922no
2001:558:14xx::/40/487922no
2001:558:14xx::/40/407922no
2001:558:94xx::/40/327922no
2001:5d8:14xx::/40/243742no
2001:8558:14xx::/40/161221no

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
Summary:
The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.
Feedback:
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