Which port must be opened on a Firewall for Kerberos?

[csanyipal@gmail.com]

Hi,

my home server get his static address from my ISP with DHCP to specific
MAC address of the eth0.

So, it seems that, that I'm behind a firewall of my ISP.

Which ports must be opened on a firewall ( on firewall of my ISP, or on
firewall of mine ), so I can reach my Kerberos server on my home server
from my mobile phone or from the Internet? 

--
Regards, from Paul