Dirk H. Schulz wrote on Mon, 22 Mar 2010 15:41:55 +0100:
makes me think that the same session with the same commands is "delivered" via 2 outgoing gateways, because it would be very complicated to have two ftp clients issue the same command in the same second. Know what I mean?
No, I don't know. This is *one* client and I bet it's the dreaded Filezilla. It opens multiple parallel connections if you don't configure it correctly. And then it's just a matter of how your internet connection and gateway is setup. This is a big institution with a big IP range (whois.ripe.net). It's not your usual type of connection, but it's nothing wrong with it.
By the way, vsftpd seems not to handle this situation securely, so I want to prevent any occurance of it.
Again, what's the security problem here?
Kai