The LPR servers embedded in printers HP printers have an undocumented line length limitation. LPR doesn't trigger this problem because it puts every option on a line of its own. LPRng overflows the printer's LPR server line buffer by putting all the options on one line. This messes up the print job and it doesn't print correctly. The next version of printtool will pop up a warning about this issue.
Network connection hang for a minute or so after parallel port job completes.
There is no connection on a raw parallel port and so the printer doesn't know exactly when a print job ends. So if you send a job to a parallel port and then try to send a job to the network interface. The job will hang for 45 seconds or so before it prints. After 45 seconds of silence on the parallel port the printer concludes that you are done with that print job and allows the one that came from the network to complete. The default modules.conf file that ships with Turbo Linux doesn't include the necessary aliases to allow parallel port autodetection to work.