You should make sure you set up a DDNS service so you don’t have to manually change the ip address when it is changed by your ISP.
–edit–
A recent discussion of different DDNS services can be found here: Alternative to noip and ddns?
If you are referring to the BANDWIDTH parameter in the run command/config file, this option is no longer used. There is no way to increase the bandwidth used by the node. If you are still using the BANDWIDTH parameter, you should check the latest documentation to make sure you are using all of the recommended parameters. BANDWIDTH was removed quite some time ago.