Session Report
Summary:
Test run at: 2016-10-19 10:53:20 GMT
Client Prefix (v4): 37.139.112.x/24
Client AS (v4): 57961 (RASH-AS)
IPv4 Probes: 105
| Outbound spoofing summary (from the client to our server) |
|---|
| Source address type |
IPv4 |
|---|
| Private -
RFC1918 |
unknown |
| Routable |
unknown |
| 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 (37.139.112.x/24) can spoof 2047 neighboring addresses (within your /21 prefix)
| Spoofed source address (anon) | Prefix
Length | ASN of spoofed
source address | Received |
|---|
| 37.139.112.x/24 | /31 | 57961 | yes |
| 37.139.112.x/24 | /30 | 57961 | yes |
| 37.139.112.x/24 | /29 | 57961 | yes |
| 37.139.112.x/24 | /28 | 57961 | yes |
| 37.139.112.x/24 | /27 | 57961 | yes |
| 37.139.112.x/24 | /26 | 57961 | yes |
| 37.139.112.x/24 | /25 | 57961 | yes |
| 37.139.112.x/24 | /24 | 57961 | yes |
| 37.139.113.x/24 | /23 | 57961 | yes |
| 37.139.114.x/24 | /22 | 57961 | yes |
| 37.139.116.x/24 | /21 | 57961 | yes |
| 37.139.120.x/24 | /20 | 57877 | natblock |
| 37.139.96.x/24 | /19 | 35816 | natblock |
| 37.139.80.x/24 | /18 | 35026 | natblock |
| 37.139.48.x/24 | /17 | UNROUTED | natblock |
| 37.139.240.x/24 | /16 | 33894 | natblock |
| 37.138.112.x/24 | /15 | 9145 | natblock |
| 37.137.112.x/24 | /14 | 57218 | natblock |
| 37.143.112.x/24 | /13 | 48926 | natblock |
| 37.131.112.x/24 | /12 | UNROUTED | natblock |
| 37.155.112.x/24 | /11 | 20978 | natblock |
| 37.171.112.x/24 | /10 | 51207 | natblock |
| 37.203.112.x/24 | /9 | 9146 | natblock |
| 37.11.112.x/24 | /8 | 12715 | natblock |
Meaning of status in Received column:
| yes | Packets spoofed from adjacent netblock were received (but that netblock is within the source AS) |
| natblock | Spoofed 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.
Summary:
The results from all tests are aggregated to produce a summary
"State of IP Spoofing" report.
Feedback:
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and invite users to join the Spoofer
Users Mailing List for discussion and announcements.
