Purpose of spoofed packets ???

Wed Mar 11 15:27:45 UTC 2015

One more outré purpose for spoofing SIPs is to have you blacklist/nullroute someone, effectively enlisting you to cause a DOS.

--p

-----Original Message-----
From: NANOG [mailto:nanog-bounces+patrick.darden=p66.com at nanog.org] On Behalf Of Matthew Huff
Sent: Tuesday, March 10, 2015 6:41 PM
To: nanog at nanog.org
Subject: [EXTERNAL]Purpose of spoofed packets ???

We recently got an abuse report of an IP address in our net range. However, that IP address isn't in use in our networks and the covering network is null routed, so no return traffic is possible. We have external BGP monitoring, so unless something very tricky is going on, we don't have part of our prefix hijacked.

I assume the source address was spoofed, but this leads to my question. Since the person that submitted the report didn't mention a high packet rate (it was on ssh port 22), it doesn't look like some sort of SYN attack, but any OS fingerprinting or doorknob twisting wouldn't be useful from the attacker if the traffic doesn't return to them, so what gives?

BTW, we are in the ARIN region, the report came out of the RIPE region.

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Matthew Huff             | 1 Manhattanville Rd Director of Operations   | Purchase, NY 10577 OTA Management LLC       | Phone: 914-460-4039
aim: matthewbhuff        | Fax:   914-694-5669