31.10 ²¢¿ÚµçÀ IP (PLIP)

¡¡¡¡PLIP ÔÊÐíÎÒÃÇÔÚÁ½¸ö²¢¿Ú¼äÔËÐÐ TCP/IP¡£ ÔÚʹÓñʼDZ¾µçÄÔ£¬ »òûÓÐÍø¿¨µÄ¼ÆËã»úʱ£¬ Õâ»á·Ç³£ÓÐÓᣠÕâÒ»½ÚÖУ¬ ÎÒÃǽ«ÌÖÂÛ£º

31.10.1 ÖÆ×÷²¢¿ÚµçÀ¡£

¡¡¡¡Äú¿ÉÒÔÔÚÐí¶à¼ÆËã»ú¹©Ó¦µêÀïÂòµ½²¢¿ÚµçÀ¡£ Èç¹ûÂò²»µ½£¬ »òÕßÏ£Íû×ÔÐÐÖÆ×÷£¬ Ôò¿ÉÒÔ²ÎÔÄÏÂÃæµÄ±í¸ñ£¬ Ëü½éÉÜÁËÈçºÎÀûÓÃÆÕͨµÄ´òÓ¡»ú²¢¿ÚµçÀÂÀ´¸ÄÖÆ£º

±í 31-1. ÓÃÓÚÍøÂçÁ¬½ÓµÄ²¢¿ÚµçÀ½ÓÏß·½Ê½

A-name A ¶Ë B ¶Ë ÃèÊö Post/Bit

DATA0 -ERROR

2 15

15 2

Êý¾Ý

0/0x01 1/0x08

DATA1 +SLCT

3 13

13 3

Êý¾Ý

0/0x02 1/0x10

DATA2 +PE

4 12

12 4

Êý¾Ý

0/0x04 1/0x20

DATA3 -ACK

5 10

10 5

Âö³å (Strobe)

0/0x08 1/0x40

DATA4 BUSY

6 11

11 6

Êý¾Ý

0/0x10 1/0x80

GND 18-25 18-25 GND -

31.10.2 ÉèÖÃ PLIP

¡¡¡¡Ê×ÏÈ£¬ÄúÐèÒªÒ»¸ù laplink Ïß¡£È»ºó£¬ È·ÈÏÁ½Ì¨¼ÆËã»úµÄÄں˶¼ÓÐ¶Ô lpt(4) Çý¶¯³ÌÐòµÄÖ§³Ö£º

# grep lp /var/run/dmesg.boot
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port

¡¡¡¡²¢¿Ú±ØÐëÊÇÒ»¸öÖжÏÇý¶¯µÄ¶Ë¿Ú£¬ ÄúÓ¦ÔÚ /boot/device.hints ÎļþÖÐÅäÖãº

hint.ppc.0.at="isa"
hint.ppc.0.irq="7"

¡¡¡¡È»ºó¼ì²éÄÚºËÅäÖÃÎļþÖÐÊÇ·ñÓÐÒ»ÐÐ device plip »ò¼ÓÔØÁË plip.ko ÄÚºËÄ£¿é¡£ ÕâÁ½ÖÖÇé¿öÏ£¬ ÔÚʹÓà ifconfig(8) ÃüÁîʱ¶¼»áÏÔʾ²¢¿Ú¶ÔÓ¦µÄÍøÂç½Ó¿Ú£¬ ÀàËÆÕâÑù£º

# ifconfig plip0
plip0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> mtu 1500

¡¡¡¡Óà laplink Ïß½ÓͨÁ½Ì¨¼ÆËã»úµÄ²¢¿Ú¡£

¡¡¡¡ÔÚÁ½±ßÒÔ root Éí·ÝÅäÖÃͨѶ²ÎÊý¡£ ÀýÈ磬 Èç¹ûÄãÏ£Íû½« host1 ͨ¹ýÁíһ̨»úÆ÷ host2 Á¬½Ó£º

                 host1 <-----> host2
IP Address    10.0.0.1      10.0.0.2

¡¡¡¡ÅäÖà host1 ÉϵÄÍøÂç½Ó¿Ú£¬ÕÕ´Ë×ö£º

# ifconfig plip0 10.0.0.1 10.0.0.2

¡¡¡¡ÅäÖà host2 ÉϵÄÍøÂç½Ó¿Ú£¬ÕÕ´Ë×ö£º

# ifconfig plip0 10.0.0.2 10.0.0.1

¡¡¡¡ÄúÏÖÔÚÓ¦¸ÃÓиö¹¤×÷µÄÁ¬½ÓÁË¡£ÏëÒª¸üÏêϸµÄÐÅÏ¢£¬ ÇëÔĶÁ lp(4) ºÍ lpt(4) ÊÖ²áÒ³¡£

¡¡¡¡Äú»¹Ó¦¸ÃÔö¼ÓÁ½¸öÖ÷»úµ½ /etc/hosts£º

127.0.0.1               localhost.my.domain localhost
10.0.0.1                host1.my.domain host1
10.0.0.2                host2.my.domain host2

¡¡¡¡ÒªÈ·ÈÏÁ¬½ÓÊÇ·ñ¹¤×÷£¬¿ÉÒÔµ½Ã¿Ò»Ì¨»ú×ÓÉÏ£¬È»ºó ping ÁíÍâһ̨¡£ÀýÈ磬ÔÚ host1 ÉÏ£º

# ifconfig plip0
plip0: flags=8851<UP,POINTOPOINT,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 10.0.0.1 --> 10.0.0.2 netmask 0xff000000
# netstat -r
Routing tables

Internet:
Destination        Gateway          Flags     Refs     Use      Netif Expire
host2              host1            UH          0       0       plip0
# ping -c 4 host2
PING host2 (10.0.0.2): 56 data bytes
64 bytes from 10.0.0.2: icmp_seq=0 ttl=255 time=2.774 ms
64 bytes from 10.0.0.2: icmp_seq=1 ttl=255 time=2.530 ms
64 bytes from 10.0.0.2: icmp_seq=2 ttl=255 time=2.556 ms
64 bytes from 10.0.0.2: icmp_seq=3 ttl=255 time=2.714 ms

--- host2 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max/stddev = 2.530/2.643/2.774/0.103 ms

±¾ÎĵµºÍÆäËüÎĵµ¿É´ÓÕâÀïÏÂÔØ£ºftp://ftp.FreeBSD.org/pub/FreeBSD/doc/.

Èç¹û¶ÔÓÚFreeBSDÓÐÎÊÌ⣬ÇëÏÈÔĶÁÎĵµ£¬Èç²»Äܽâ¾öÔÙÁªÏµ<questions@FreeBSD.org>.
¹ØÓÚ±¾ÎĵµµÄÎÊÌâÇë·¢ÐÅÁªÏµ <doc@FreeBSD.org>.