On Tue, 2004-08-03 at 15:34, Paul Schmehl wrote: > Frank, I've only checked two of the "attacking" IPs, but they are both > BigIP load balancers. I'd bet that they all are, and these packets are > some sort of probe to see if a host that contacted them before is still > alive. hmm... I think it's a bit early to say that. After all, why doesn't it contact other systems? Why would it have to recheck in the first place? And why would it use a) a valid DNS query, b) and obscure, non-standard SYN packet, and c) a DNS query *specifically* including the "pinged" hosts' IP address in reverse notation? I strongly doubt that the F5 engineers through *that* would be a good way to see if a host is still alive. Even if, what would the BigIP gain from it? Nuttin' (as we say here in TN :) The mystery continues... Later, Frank
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