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Session Report

Summary:
Test run at: 2017-02-07 18:37:49 GMT
Client Prefix (v4): 199.187.221.x/24
Client AS (v4): 19230 (NANOG)
IPv4 Probes: 104
Client Prefix (v6): 2001:558:14xx::/40
Client AS (v6): 7922 (COMCAST-7922)
IPv6 Probes: 72
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA blockedunknown
Routable blockedunknown
Largest spoofable neighbor prefix length /21none

Meaning of result status in column:

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.
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 (199.187.221.x/24) can spoof 2047 neighboring addresses (within your /21 prefix)


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
199.187.221.x/24/3119230yes
199.187.221.x/24/3019230yes
199.187.221.x/24/2919230yes
199.187.221.x/24/2819230yes
199.187.221.x/24/2719230yes
199.187.221.x/24/2619230yes
199.187.221.x/24/2519230yes
199.187.221.x/24/2419230yes
199.187.220.x/24/2319230yes
199.187.223.x/24/2219230yes
199.187.217.x/24/2119230yes
199.187.213.x/24/20UNROUTEDno
199.187.205.x/24/1919331no
199.187.253.x/24/1819201no
199.187.157.x/24/1711641no
199.187.93.x/24/16UNROUTEDno
199.186.221.x/24/157018no
199.185.221.x/24/14852no
199.191.221.x/24/13UNROUTEDno
199.179.221.x/24/12UNROUTEDno
199.171.221.x/24/11701no
199.155.221.x/24/104152no
199.251.221.x/24/9721no
199.59.221.x/24/8UNROUTEDno

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
yesPackets spoofed from adjacent netblock were received (but that netblock is within the source AS)

IPv4 Outbound Filtering Depth:

The tracefilter test found your host unable to spoof routable, non-adjacent source addresses through even the first IP hop.
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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