Printer trouble

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http://forums.fedoraforum.org – I setup my Canon MX870 while running F17. I successfully printed a test page, and didn't print anything after that. I upgraded to F18 and tried to print, but nothing was sent to the printer. I've checked Cups (localhost:631) and it shows that the print jobs completed. While trying to troubleshoot I found that I can't ping my printer anymore. Well, I can but not always. Not sure what triggers it. I have a Windows VM running on the same computer, and it can ping and print, so it's not the printer, and there's nothing physically wrong. Any ideas why I can't ping the printer? I"m usi (HowTos)