Test run at: 2017-12-21 17:46:24 GMT
Client Prefix (v4): 81.205.239.x/24
Client AS (v4): 1136 (KPN)
IPv4 Probes: 102
Client Prefix (v6): 2a02:a443:c8xx::/40
Client AS (v6): 1136 (KPN)
IPv6 Probes: 62
Outbound spoofing summary (from the client to our server) Source address type IPv4 IPv6 Private - RFC1918 or ULA rewritten blocked Routable rewritten blocked Largest spoofable neighbor prefix length none /48
Spoof status key received Spoofed packet was received. ✔ Pattern of tests from this IP block indicates a switch from allowing spoofing to blocking it. rewritten Spoofed packet was received, but the source address was changed en route. blocked Spoofed packet was not received, but unspoofed packet was. unknown Neither spoofed nor unspoofed packet was received.
Warnings:
IPv4 Adjacent Netblock Testing:
Your host (81.205.239.x/24) can spoof 0 neighboring addresses
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 81.205.239.x/24 /31 1136 rewritten 81.205.239.x/24 /30 1136 rewritten 81.205.239.x/24 /29 1136 rewritten 81.205.239.x/24 /28 1136 rewritten 81.205.239.x/24 /27 1136 rewritten 81.205.239.x/24 /26 1136 rewritten 81.205.239.x/24 /25 1136 rewritten 81.205.239.x/24 /24 1136 rewritten 81.205.238.x/24 /23 1136 rewritten 81.205.237.x/24 /22 1136 rewritten 81.205.235.x/24 /21 1136 rewritten 81.205.231.x/24 /20 1136 rewritten 81.205.255.x/24 /19 1136 rewritten 81.205.207.x/24 /18 1136 rewritten 81.205.175.x/24 /17 1136 rewritten 81.205.111.x/24 /16 1136 rewritten 81.204.239.x/24 /15 1136 rewritten 81.207.239.x/24 /14 1136 rewritten 81.201.239.x/24 /13 12923 rewritten 81.197.239.x/24 /12 719 rewritten 81.221.239.x/24 /11 1836 rewritten 81.237.239.x/24 /10 3301 rewritten 81.141.239.x/24 /9 2856 rewritten 81.77.239.x/24 /8 5388 rewritten Meaning of status in Received column:
rewritten The 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 able to spoof routable, non-adjacent source addresses through the first 1 IP hop(s).IPv6 probes:
IPv6 Adjacent Netblock Testing:
Spoofed source address Destination Received 2001:4978:1fb:6400::d2 2001:388:1:5001:21c:c0ff:fea2:4a3a no 2001:49aa:111:aa00::11 2001:388:1:5001:21c:c0ff:fea2:4a3a no fd11:1111:1111::1111 2001:388:1:5001:21c:c0ff:fea2:4a3a no 2001:4978:1fb:6400::d2 2001:410:102:1::78 no 2001:49aa:111:aa00::11 2001:410:102:1::78 no fd11:1111:1111::1111 2001:410:102:1::78 no 2001:4978:1fb:6400::d2 2001:410:90ff::5 no 2001:49aa:111:aa00::11 2001:410:90ff::5 no fd11:1111:1111::1111 2001:410:90ff::5 no 2001:4978:1fb:6400::d2 2001:48d0:101:501::242 no 2001:49aa:111:aa00::11 2001:48d0:101:501::242 no fd11:1111:1111::1111 2001:48d0:101:501::242 no 2001:4978:1fb:6400::d2 2001:48d0:101:501::247 no 2001:49aa:111:aa00::11 2001:48d0:101:501::247 no fd11:1111:1111::1111 2001:48d0:101:501::247 no 2001:4978:1fb:6400::d2 2001:610:510:115:192:42:115:98 no 2001:49aa:111:aa00::11 2001:610:510:115:192:42:115:98 no fd11:1111:1111::1111 2001:610:510:115:192:42:115:98 no 2001:4978:1fb:6400::d2 2001:630:212:225:225:90ff:fe0c:45a6 no 2001:49aa:111:aa00::11 2001:630:212:225:225:90ff:fe0c:45a6 no fd11:1111:1111::1111 2001:630:212:225:225:90ff:fe0c:45a6 no 2001:4978:1fb:6400::d2 2001:708:40:2001:21c:c0ff:fea2:4c5c no 2001:49aa:111:aa00::11 2001:708:40:2001:21c:c0ff:fea2:4c5c no fd11:1111:1111::1111 2001:708:40:2001:21c:c0ff:fea2:4c5c no 2001:4978:1fb:6400::d2 2001:770:18:7:225:90ff:fe0c:acb4 no 2001:49aa:111:aa00::11 2001:770:18:7:225:90ff:fe0c:acb4 no fd11:1111:1111::1111 2001:770:18:7:225:90ff:fe0c:acb4 no 2001:4978:1fb:6400::d2 2001:df0:4:800:21c:c0ff:feb2:ad5f no 2001:49aa:111:aa00::11 2001:df0:4:800:21c:c0ff:feb2:ad5f no fd11:1111:1111::1111 2001:df0:4:800:21c:c0ff:feb2:ad5f no
Summary:
Spoofed source address (anon) Prefix
LengthASN of spoofed
source addressReceived 2a02:a443:c8xx::/40 /120 1136 yes 2a02:a443:c8xx::/40 /112 1136 yes 2a02:a443:c8xx::/40 /104 1136 yes 2a02:a443:c8xx::/40 /96 1136 yes 2a02:a443:c8xx::/40 /88 1136 yes 2a02:a443:c8xx::/40 /80 1136 yes 2a02:a443:c8xx::/40 /72 1136 yes 2a02:a443:c8xx::/40 /64 1136 yes 2a02:a443:c8xx::/40 /56 1136 yes 2a02:a443:c8xx::/40 /48 1136 yes 2a02:a443:c8xx::/40 /40 1136 no 2a02:a443:48xx::/40 /32 1136 no 2a02:a4c3:c8xx::/40 /24 12552 no 2a02:2443:c8xx::/40 /16 12552 no Meaning of status in Received column:
no Packets spoofed from adjacent netblock were not received, probably due to blocking yes Packets spoofed from adjacent netblock were received (but that netblock is within the source AS)
The results from all tests are aggregated to produce a summary "State of IP Spoofing" report.Feedback:
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