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Session Report

Summary:
Test run at: 2017-01-03 13:47:37 GMT
Client Prefix (v4): 194.228.20.x/24
Client AS (v4): 5610 (O2-CZECH-REPUBLIC)
IPv4 Probes: 91
Client Prefix (v6): 2a00:1028:83xx::/40
Client AS (v6): 5610 (O2-CZECH-REPUBLIC)
IPv6 Probes: 64
Outbound spoofing summary (from the client to our server)
Source address type IPv4IPv6
Private - RFC1918 or ULA rewrittenblocked
Routable rewrittenblocked
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 (194.228.20.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
194.228.20.x/24/315610rewritten
194.228.20.x/24/305610rewritten
194.228.20.x/24/295610rewritten
194.228.20.x/24/285610rewritten
194.228.20.x/24/275610rewritten
194.228.20.x/24/265610rewritten
194.228.20.x/24/255610rewritten
194.228.20.x/24/245610rewritten
194.228.21.x/24/235610rewritten
194.228.22.x/24/225610rewritten
194.228.16.x/24/215610rewritten
194.228.28.x/24/205610rewritten
194.228.4.x/24/195610rewritten
194.228.52.x/24/185610rewritten
194.228.84.x/24/175610rewritten
194.228.148.x/24/165610rewritten
194.229.20.x/24/15702rewritten
194.230.20.x/24/146730rewritten
194.224.20.x/24/133352rewritten
194.236.20.x/24/123301rewritten
194.244.20.x/24/113302rewritten
194.196.20.x/24/102686rewritten
194.164.20.x/24/98897rewritten
194.100.20.x/24/816086rewritten

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 probes:
Spoofed source addressDestinationReceived
2001:4978:1fb:6400::d22001:388:1:5001:21c:c0ff:fea2:4a3ano
2001:49aa:111:aa00::112001:388:1:5001:21c:c0ff:fea2:4a3ano
fd11:1111:1111::11112001:388:1:5001:21c:c0ff:fea2:4a3ano
2001:4978:1fb:6400::d22001:410:102:1::78no
2001:49aa:111:aa00::112001:410:102:1::78no
fd11:1111:1111::11112001:410:102:1::78no
2001:4978:1fb:6400::d22001:48d0:101:501::242no
2001:49aa:111:aa00::112001:48d0:101:501::242no
fd11:1111:1111::11112001:48d0:101:501::242no
2001:4978:1fb:6400::d22001:48d0:101:501::247no
2001:49aa:111:aa00::112001:48d0:101:501::247no
fd11:1111:1111::11112001:48d0:101:501::247no
2001:4978:1fb:6400::d22001:610:510:115:192:42:115:98no
2001:49aa:111:aa00::112001:610:510:115:192:42:115:98no
fd11:1111:1111::11112001:610:510:115:192:42:115:98no
2001:4978:1fb:6400::d22001:630:212:225:225:90ff:fe0c:45a6no
2001:49aa:111:aa00::112001:630:212:225:225:90ff:fe0c:45a6no
fd11:1111:1111::11112001:630:212:225:225:90ff:fe0c:45a6no
2001:4978:1fb:6400::d22001:708:40:2001:21c:c0ff:fea2:4c5cno
2001:49aa:111:aa00::112001:708:40:2001:21c:c0ff:fea2:4c5cno
fd11:1111:1111::11112001:708:40:2001:21c:c0ff:fea2:4c5cno
2001:4978:1fb:6400::d22001:770:18:7:225:90ff:fe0c:acb4no
2001:49aa:111:aa00::112001:770:18:7:225:90ff:fe0c:acb4no
fd11:1111:1111::11112001:770:18:7:225:90ff:fe0c:acb4no
Summary:
The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.
Feedback:
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