Session Report
Summary:
Test run at: 2016-02-09 22:17:15 GMT
Client Prefix (v4): 199.187.221.x/24
Client AS (v4): 19230 (NANOG)
IPv4 Probes: 87
Client Prefix (v6): 2620:0:cxx::/40
Client AS (v6): 19230 (NANOG)
Outbound spoofing summary (from the client to our server) |
Source address type |
IPv4 |
Private -
RFC1918 |
✔ | blocked |
Routable |
blocked |
Largest spoofable neighbor prefix length |
/21 |
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. |
IPv4 Adjacent Netblock Testing:
Your host (199.187.221.x/24) can spoof 2047 neighboring addresses (within your /21 prefix)
Spoofed source address (anon) | Prefix Length | ASN of spoofed source address | Received |
199.187.221.x/24 | /31 | 19230 | yes |
199.187.221.x/24 | /30 | 19230 | yes |
199.187.221.x/24 | /29 | 19230 | yes |
199.187.221.x/24 | /28 | 19230 | yes |
199.187.221.x/24 | /27 | 19230 | yes |
199.187.221.x/24 | /26 | 19230 | yes |
199.187.221.x/24 | /25 | 19230 | yes |
199.187.221.x/24 | /24 | 19230 | yes |
199.187.220.x/24 | /23 | 19230 | yes |
199.187.223.x/24 | /22 | 19230 | yes |
199.187.217.x/24 | /21 | 19230 | yes |
199.187.213.x/24 | /20 | 14185 | no |
199.187.205.x/24 | /19 | 19331 | no |
199.187.253.x/24 | /18 | 19201 | no |
199.187.157.x/24 | /17 | 11641 | no |
199.187.93.x/24 | /16 | UNROUTED | no |
199.186.221.x/24 | /15 | 7018 | no |
199.185.221.x/24 | /14 | 852 | no |
199.191.221.x/24 | /13 | UNROUTED | no |
199.179.221.x/24 | /12 | UNROUTED | no |
199.171.221.x/24 | /11 | 701 | no |
199.155.221.x/24 | /10 | 4152 | no |
199.251.221.x/24 | /9 | 721 | no |
199.59.221.x/24 | /8 | UNROUTED | 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) |
IPv4 Outbound 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.
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