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Center for Applied Internet Data Analysis
Session Report

Test run at: 2017-08-28 16:37:47 GMT
Client Prefix (v4): 185.41.141.x/24
Client AS (v4): 174 (COGENT-174)
IPv4 Probes: 117

Egress spoofing summary
Address type IPv4
Private blocked
Routable blocked
Largest spoofable neighbor prefix none

Warnings:

  • Your host is behind a filtering Network Address Translation (NAT) router or firewall. The NAT is blocking spoofed traffic rather than rewriting the source address. To test your provider's network further, you must remove the NAT/firewall/router and connect directly.

    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.
    
    

    IPv4 Adjacent Netblock Testing:

    Your host (185.41.141.x/24) can spoof 0 neighboring addresses


    Spoofed IP (anon)Prefix
    Length
    ASN of
    Spoofed IP
    Received
    185.41.141.x/24/31174natblock
    185.41.141.x/24/30174natblock
    185.41.141.x/24/29174natblock
    185.41.141.x/24/28174natblock
    185.41.141.x/24/27174natblock
    185.41.141.x/24/26174natblock
    185.41.141.x/24/25174natblock
    185.41.141.x/24/24174natblock
    185.41.140.x/24/23UNROUTEDnatblock
    185.41.143.x/24/2249544natblock
    185.41.137.x/24/2151313natblock
    185.41.133.x/24/2016242natblock
    185.41.157.x/24/19UNROUTEDnatblock
    185.41.173.x/24/18UNROUTEDnatblock
    185.41.205.x/24/17204144natblock
    185.41.13.x/24/16UNROUTEDnatblock
    185.40.141.x/24/15UNROUTEDnatblock
    185.43.141.x/24/14199848natblock
    185.45.141.x/24/13199800natblock
    185.33.141.x/24/1241709natblock
    185.57.141.x/24/11UNROUTEDnatblock
    185.9.141.x/24/10202892natblock
    185.105.141.x/24/9200437natblock
    185.169.141.x/24/861053natblock

    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 Egress 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.
      Last Modified: