It's not complete, but if you're receiving the ICMP net/port unreachable backscatter it should include a portion of the original packet. This might provide some insight into the TTL left on TCP the packet when it reached its destination which could provide a rough radius that you would need to look at. Also, if the TTL is constant it would support the idea that one or few hosts are spoofing your address block, but if the TTL varies widely it might indicate that many bots are spoofing your address block. You might check looking glass tools or something like https://radar.qrator.net to see if someone is not only spoofing your address range, but has gone farther and has hijacked it. Good luck, --B On 3/14/2020 1:23 AM, William Herrin wrote:
Howdy,
Can anyone suggest tools, techniques and helpful contacts for backtracking spoofed packets? At the moment someone is forging TCP syns from my address block. I'm getting the syn/ack and icmp unreachable backscatter. Enough that my service provider briefly classified it a DDOS. I'd love to find the culprit.
Thanks, Bill Herrin