Session Report
Summary:
Test run at: 2020-08-24 23:09:53 GMT
Client Prefix (v4): 139.99.176.x/24
Client AS (v4): 16276 (OVH)
IPv4 Probes: 75
| Outbound spoofing summary (from the client to our server) |
|---|
| Source address type |
IPv4 |
|---|
| Private -
RFC1918 |
blocked |
| Routable |
blocked |
| Largest spoofable neighbor prefix length |
/28 |
| 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 (139.99.176.x/24) can spoof 15 neighboring addresses (within your /28 prefix)
| Spoofed source address (anon) | Prefix
Length | ASN of spoofed
source address | Received |
|---|
| 139.99.176.x/24 | /31 | 16276 | yes |
| 139.99.176.x/24 | /30 | 16276 | yes |
| 139.99.176.x/24 | /29 | 16276 | yes |
| 139.99.176.x/24 | /28 | 16276 | yes |
| 139.99.176.x/24 | /27 | 16276 | natblock |
| 139.99.176.x/24 | /26 | 16276 | natblock |
| 139.99.176.x/24 | /25 | 16276 | natblock |
| 139.99.176.x/24 | /24 | 16276 | natblock |
| 139.99.177.x/24 | /23 | 16276 | natblock |
| 139.99.178.x/24 | /22 | 16276 | natblock |
| 139.99.180.x/24 | /21 | 16276 | natblock |
| 139.99.184.x/24 | /20 | 16276 | natblock |
| 139.99.160.x/24 | /19 | 16276 | natblock |
| 139.99.144.x/24 | /18 | 16276 | natblock |
| 139.99.240.x/24 | /17 | 16276 | natblock |
| 139.99.48.x/24 | /16 | 16276 | natblock |
| 139.98.176.x/24 | /15 | 2116 | natblock |
| 139.97.176.x/24 | /14 | 719 | natblock |
| 139.103.176.x/24 | /13 | 611 | natblock |
| 139.107.176.x/24 | /12 | 5619 | natblock |
| 139.115.176.x/24 | /11 | 5619 | natblock |
| 139.67.176.x/24 | /10 | 5742 | natblock |
| 139.35.176.x/24 | /9 | UNROUTED | natblock |
| 139.227.176.x/24 | /8 | 17621 | 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
able to spoof routable, non-adjacent source addresses through the
first 2 IP hop(s).
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.
