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Center for Applied Internet Data Analysis
Session Report

Test run at: 2017-09-28 08:58:44 GMT
Client Prefix (v4): 37.188.168.x/24
Client AS (v4): 5610 (O2-CZECH-REPUBLIC)
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 (37.188.168.x/24) can spoof 0 neighboring addresses


    Spoofed IP (anon)Prefix
    Length
    ASN of
    Spoofed IP
    Received
    37.188.168.x/24/315610natblock
    37.188.168.x/24/305610natblock
    37.188.168.x/24/295610natblock
    37.188.168.x/24/285610natblock
    37.188.168.x/24/275610natblock
    37.188.168.x/24/265610natblock
    37.188.168.x/24/255610natblock
    37.188.168.x/24/245610natblock
    37.188.169.x/24/235610natblock
    37.188.170.x/24/225610natblock
    37.188.172.x/24/215610natblock
    37.188.160.x/24/205610natblock
    37.188.184.x/24/195610natblock
    37.188.136.x/24/185610natblock
    37.188.232.x/24/175610natblock
    37.188.40.x/24/1642277natblock
    37.189.168.x/24/153243natblock
    37.190.168.x/24/1421021natblock
    37.184.168.x/24/135432natblock
    37.180.168.x/24/1230722natblock
    37.172.168.x/24/1151207natblock
    37.156.168.x/24/1031638natblock
    37.252.168.x/24/929990natblock
    37.60.168.x/24/847297natblock

    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: