Re: FW: Question for DNS pros

[Frank Knobbe <frank () knobbe us>]

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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