SSH vs. IPSEC and Kerberos
 

Hi

I'm looking for a most possible, secure solution to transfer data using rsync over Internet between 2 linux server.
I have 3 option: SSH, IPSEC and Kerberos.
Which one in your opinion should be most secure solution?

ssh takes about 5 minutes to configure and is trivial to use with rsync. unless you already have ipsec configured, its going to be a lot of work.

IPsec
 

In my opinion IPsec is the most secure protocol over SSL and Kerberos and does not have to be hard to install. It often gets a bad rap because it does have the better security and hence more options as more secure algorithms are implemented.

Kerberos doesn't provide any amount of security for data transfer. It's merely an authentication and authorization system. SSH and IPSec are based on the same encryption algorithms and thus (in general) offer the same level of security. IPSec is more complicated, requires kernel-level support, and has issues traversing some cheaper routers.