linux - 两台机器之间通过串行方式进行 ppp 传输，无需调制解调器

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我正在尝试通过串行线路在两台 Linux 计算机之间建立 PPP 连接。我关注了these instructions但没有成功。两台机器分别是Fedora 28 Linux在Intel(R) Core(TM) i7-7600U CPU @ 2.80GHz上和一个带有 Linux 4.14.0-xilinx-v2018.2 的定制板在ARMv7 A上。

以下是我在 Fedora 上得到的命令和输出机器:

$ sudo pppd -detach debug passive lock xonxoff 192.168.10.100:192.168.10.1 /dev/ttyUSB0 9600
[sudo] password for user:
using channel 3
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB0
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
sent [LCP ConfReq id=0x1 <asyncmap 0xa0000> <magic 0x888f0bcb> <pcomp> <accomp>]
LCP: timeout sending Config-Requests

这是我得到的命令和输出 Linux 4.14.0-xilinx-v2018.2

root@cpe-08:/data# pppd -detach debug passive lock xonxoff 192.168.10.1:192.168.10.100 /dev/ttyS0 9
600

是的，你没有看错，没有其他输出 Linux4.14.0-xilinx-v2018.2 .

我期待看到ppp0两台机器上都有界面，但没有看到任何一个。

这是 ifconfig 的输出上Fedora 28运行后pppd命令

$ ifconfig
enp0s20f0u2u2: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.24.176.116  netmask 255.255.255.0  broadcast 172.24.176.255
        inet6 fe80::63fd:53b6:8b94:1abf  prefixlen 64  scopeid 0x20<link>
        ether 00:0e:c6:a5:94:88  txqueuelen 1000  (Ethernet)
        RX packets 5016  bytes 457454 (446.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1368  bytes 141981 (138.6 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enp0s31f6: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 54:e1:ad:8c:32:a5  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 16  memory 0xec200000-ec220000

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 184264  bytes 109696260 (104.6 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 184264  bytes 109696260 (104.6 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
        ether 52:54:00:62:c0:6c  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp58s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 100.96.37.134  netmask 255.255.255.192  broadcast 100.96.37.191
        inet6 fe80::3728:7f03:ba95:5757  prefixlen 64  scopeid 0x20<link>
        inet6 2620:10d:c0be:2226:7261:932:1670:38bb  prefixlen 64  scopeid 0x0<global>
        ether f8:34:41:af:1a:0e  txqueuelen 1000  (Ethernet)
        RX packets 13305344  bytes 16391874252 (15.2 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 5691206  bytes 1228184162 (1.1 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

这是 ifconfig 的输出在Linux 4.14.0-xilinx-v2018.2上运行 pppd 后命令

# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:04:35:00:01:08
          inet addr:172.24.176.208  Bcast:172.24.176.255  Mask:255.255.255.0
          inet6 addr: fe80::204:35ff:fe00:108/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:2515 errors:0 dropped:0 overruns:0 frame:0
          TX packets:753 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:221227 (216.0 KiB)  TX bytes:93698 (91.5 KiB)
          Interrupt:27 Base address:0xb000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:36160 errors:0 dropped:0 overruns:0 frame:0
          TX packets:36160 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1516794 (1.4 MiB)  TX bytes:1516794 (1.4 MiB)

我知道Linux 4.14.0-xilinx-v2018.2编译后包含ppp支持。我本来会包含“.config”的摘录，但构建时并未提供它。我知道的原因ppp支持在内核中是因为我问了我们的构建人员，他说他包含了它。如果有任何帮助，我将不胜感激。

Answer 1

经过一段时间的摸索，我终于让它工作了。这是 Fedora 机器的命令

sudo 0pppd -detach local debug noauth passive lock 192.168.10.100:192.168.10.1 /dev/ttyUSB0 9600

这是适用于 Linux 4.14.0-xilinx-v2018.2 机器的命令

pppd -detach persist debug local noauth passive lock 192.168.10.1:192.168.10.100 /dev/ttyS0 9600

过去两个月我一直在努力解决这个问题。不知道为什么这个问题最初被降级。我想其他人也有同样的问题。