At the moment there is no way to go online on 3.55, no DNS bypass or anything.
Maybe in the future there will be someone that finds out a way to go online on 3.55 or maybe someone even find out on how to Jailbreak 3.56, there for I would wait till you update your PS3, or if you really want to host CLs online, than update, but remember, if you update you can not change any patches or run any programs.