well why do you want to connect it to the internet? If you want online play you must update to the latest firmware. If you want to play backup games do not update to the latest firmware.
If you simple want to surf the web and download game updates and not use the PSN then you do not need to update.
If you want to play online and swap game discs then plug in the net and let it upgrade. You'll really enjoy the PS3.
If you want to hack the ps3, play with custom firmware and game backups so you don't need to swap discs then for the love of gawd do not update the firmware. Read, read, read, and then ask a few questions. We'll help you out.
You can play online for a couple more days with older firmware using the DNS trick but this will stop working in about 5 more days. Then online play will no longer work.