plip(4) - NetBSD Manual Pages

PLIP(4)              NetBSD/pc532 Kernel Interfaces Manual             PLIP(4)


NAME

     plip - Option for the lpt driver to allow IP over Centronics parallel
     ports


SYNOPSIS

     options PLIP
     options COMPAT_PLIP10
     options COMPAT_PLIP11


DESCRIPTION

     The plip interface provides a way to transport IP over Centronics paral-
     lel ports.  Protocols to communicate with Linux 1.0 and Linux 1.1 hosts
     are provided.  By default the 1.1 protocol is used.  To choose the 1.0
     protocol use the link0 flag with ifconfig(8).  In order to use the 1.0
     protocol the kernel has to be compiled with COMPAT_PLIP10.

     The COMPAT_PLIP11 option selects a default MTU of 1486 bytes.  This is
     necessary to work around a bug that is present in the plip code for Linux
     1.1.x and Linux 1.2.x.


NOTES

     To connect two computers a "Laplink parallel cable" is used:

     allbox tab(|); c|c|c|c l|n|n|l.  Signalname|Con A|Con B|Description Data
     0|2|15|Data out 0 Data 1|3|13|Data out 1 Data 2|4|12|Data out 2 Data
     3|5|10|Data out 3/Wake out Data 4|6|11|Data clock out /Ack|10|5|Data in
     3/Wake in Busy|11|6|Data clock in No Paper|12|4|Data in 2
     Select|13|3|Data in 1 /Error|15|2|Data in 0 Gnd|18-25|18-25|Ground

     In both protocol versions Ethernet frames are used.  The 1.0 protocol
     assigns an Ethernet address of the form FD:FD:ww:xx:yy:zz to the inter-
     face.

     The 1.1 protocol uses FC instead of FD, with ww, xx, yy and zz are taken
     from the internet address ww.xx.yy.zz of the interface.  Ethernet support
     has to be configured into the kernel in order to use the plip interface.


DIAGNOSTICS

     plip?: tx hard error  Packet transmission failed even after PLIPMXRETRY
     (20) retries.

     plip?: rx hard error  PLIPMXERRS (20) packets caused receive errors in
     sequence.

     plip?: checksum error  A packet with a bad checksum was received.

     plip?: packet > MTU  A bogus packet longer than the Maximum Transmission
     Unit (MTU) length for the media was received.


SEE ALSO

     lpt(4), ifconfig(8)


HISTORY

     The plip interface appeared in NetBSD 1.0.

NetBSD 2.0.2                   December 1, 1994                   NetBSD 2.0.2