I'm suse-rookie so pointing me to the right documentation is more than enough :-)

Which ip's/ports I should open in my corpo firewall to enable online updates ?
I have totally isolated SLES 11 SP4 for SAP systems, however I can enable some limited communication for specific external IP's/ports. Is there any reference which addresses is suse_register and zypper using to get registered and updates ?
I considering setting up SMT , but still the same limitations applly.