Session Report
Summary:
Test run at: 2020-08-24 22:50:05 GMT
Client Prefix (v4): 37.48.103.x/24
Client AS (v4): 60781 (LEASEWEB-NL-AMS-01)
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 |
/27 |
| 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 (37.48.103.x/24) can spoof 31 neighboring addresses (within your /27 prefix)
| Spoofed source address (anon) | Prefix
Length | ASN of spoofed
source address | Received |
|---|
| 37.48.103.x/24 | /31 | 60781 | yes |
| 37.48.103.x/24 | /30 | 60781 | natblock |
| 37.48.103.x/24 | /29 | 60781 | yes |
| 37.48.103.x/24 | /28 | 60781 | yes |
| 37.48.103.x/24 | /27 | 60781 | yes |
| 37.48.103.x/24 | /26 | 60781 | natblock |
| 37.48.103.x/24 | /25 | 60781 | natblock |
| 37.48.103.x/24 | /24 | 60781 | natblock |
| 37.48.102.x/24 | /23 | 60781 | natblock |
| 37.48.101.x/24 | /22 | 60781 | natblock |
| 37.48.99.x/24 | /21 | 60781 | natblock |
| 37.48.111.x/24 | /20 | 60781 | natblock |
| 37.48.119.x/24 | /19 | 60781 | natblock |
| 37.48.71.x/24 | /18 | 60781 | natblock |
| 37.48.39.x/24 | /17 | 13036 | natblock |
| 37.48.231.x/24 | /16 | 206347 | natblock |
| 37.49.103.x/24 | /15 | 6830 | natblock |
| 37.50.103.x/24 | /14 | 3320 | natblock |
| 37.52.103.x/24 | /13 | 6849 | natblock |
| 37.56.103.x/24 | /12 | 25019 | natblock |
| 37.32.103.x/24 | /11 | 207630 | natblock |
| 37.16.103.x/24 | /10 | 60109 | natblock |
| 37.112.103.x/24 | /9 | 56420 | natblock |
| 37.176.103.x/24 | /8 | 30722 | 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:
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and invite users to join the Spoofer
Users Mailing List for discussion and announcements.
