misc/102035: plip networking disables parallel port printing

George Mitchell george at m5p.com
Mon Aug 14 21:21:14 UTC 2006

>Number:         102035
>Category:       misc
>Synopsis:       plip networking disables parallel port printing
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Aug 14 21:20:12 GMT 2006
>Originator:     George Mitchell
>Release:        FreeBSD 6.1-RELEASE i386
Mitchell Voting Products, Inc.
System: FreeBSD parkstreet.m5p.com 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Sun May 7 04:32:43 UTC 2006 root at opus.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386

	If a machine has one or more parallel ports, the generic kernel will
	enable plip networking on them, making it impossible to open the
	port(s) for printing.
	Boot a generic kernel with an unmodified /etc/rc.conf on it on a
	machine with a parallel port priner on it.  It will be impossible to
	print to the printer because interface plip0 will have grabbed the
	This patch disables plip interfaces by default:

--- etc/defaults/rc.conf.orig	Wed Mar  8 22:52:39 2006
+++ etc/defaults/rc.conf	Mon Aug 14 14:11:27 2006
@@ -163,6 +163,11 @@
 #ifconfig_fxp0_name="net0"	# Change interface name from fxp0 to net0.
 #ipv4_addrs_fxp0="" # example IPv4 address entry.
+# Bringing plip interfaces up will disable parallel port printing
+ifconfig_plip0="down"	# most users won't want IP over parallel
 # If you have any sppp(4) interfaces above, you might also want to set
 # the following parameters.  Refer to spppcontrol(8) for their meaning.
 sppp_interfaces=""		# List of sppp interfaces.

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