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Session Report

Summary:
Test run at: 2017-05-16 13:13:18 GMT
Client Prefix (v4): 219.230.75.x/24
Client AS (v4): 4538 (ERX-CERNET-BKB)
IPv4 Probes: 131
Client Prefix (v6): 2001:da8:10xx::/40
Client AS (v6): 23910 (CNGI-CERNET2-AS-AP)
IPv6 Probes: 77
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 Adjacent Netblock Testing:

Your host (219.230.75.x/24) can spoof 0 neighboring addresses


Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
219.230.75.x/24/314538natblock
219.230.75.x/24/304538natblock
219.230.75.x/24/294538natblock
219.230.75.x/24/284538natblock
219.230.75.x/24/274538natblock
219.230.75.x/24/264538natblock
219.230.75.x/24/254538natblock
219.230.75.x/24/244538natblock
219.230.74.x/24/234538natblock
219.230.73.x/24/224538natblock
219.230.79.x/24/214538natblock
219.230.67.x/24/204538natblock
219.230.91.x/24/194538natblock
219.230.107.x/24/184538natblock
219.230.11.x/24/174538natblock
219.230.203.x/24/164538natblock
219.231.75.x/24/154538natblock
219.228.75.x/24/144538natblock
219.226.75.x/24/134538natblock
219.238.75.x/24/1217816natblock
219.246.75.x/24/114538natblock
219.198.75.x/24/1017676natblock
219.166.75.x/24/94713natblock
219.102.75.x/24/82514natblock

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 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::d22001:410:90ff::5no
2001:49aa:111:aa00::112001:410:90ff::5no
fd11:1111:1111::11112001:410:90ff::5no
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
IPv6 Adjacent Netblock Testing:
Spoofed source address (anon)Prefix
Length
ASN of spoofed
source address
Received
2001:da8:10xx::/40/12023910no
2001:da8:10xx::/40/11223910no
2001:da8:10xx::/40/10423910no
2001:da8:10xx::/40/9623910no
2001:da8:10xx::/40/8823910no
2001:da8:10xx::/40/8023910no
2001:da8:10xx::/40/7223910no
2001:da8:10xx::/40/6423910no
2001:da8:10xx::/40/5623910no
2001:da8:10xx::/40/4823910no
2001:da8:10xx::/40/4023910no
2001:da8:90xx::/40/3223910no
2001:d28:10xx::/40/249621no
2001:8da8:10xx::/40/161221no

Meaning of status in Received column:

noPackets spoofed from adjacent netblock were not received, probably due to blocking
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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