I recently bought a new Canon wireless printer and it connects fine to the DIR-842, but when I try to set a reserve IP address for the printer I can put in all the information, but the SAVE button doesn't appear to do anything.  I have several other devices that I have successfully set reserve IP addresses for, but it won't work for the Canon Printer.  My router is DIR-842, HW B1, and Firmware 2.02  It's located in the US, north America.  Upgrade tells me it's the most current version.