Printing to a network printer

[Robert B. Haehnel]

I want to print from my linux box to a network printer. Local printing to my
/dev/lp0 works fine, but not to the printers on my LAN. If I print from my
acct on the sun station all I have to do is type:

lpr -PPrintername filename

I try the same with my linuxbox, and I get:

lpr: Printername: unknown printer

How do I get linux to recognize these networked printers?