You make it sound so easy!Probably is if you have a freaking clue what you're doing.
Let's say I do that. Okay, so now untangle would be my router. I need to set up my internet connection (that part is easy), I need to configure my port forwards so they are the same as they are on the dlink now (guess I can write down the settings from the dlink) and set them up on untangle, then I need to tell the dlink to stop working so hard.
My guess is I would change the dlink from PPPoE to dynamic, shut off DHCP and leave the wireless settings as they are now? And as for physically plugging in things, my guess would be dsl moden to untangle external, untangle internal to one of the switch ports on the wireless router (not the WAN port), then everything else would work off of that.
Sorry if I ask too many things but I want to make sure I have this all set up right so I don;t have network users screaming at me!