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Alex's questions

Martin Hope
Alex
Asked: 2024-01-02 17:53:02 +0800 CST
  • 5

使用 ubuntu 22.04，我尝试将两个 IP 地址192.168.200.100和分配169.254.1.0给以太网设备enx00e04c680202。根据本教程和这个答案，/etc/netplan/01-network-config_home.yaml我创建了一个包含以下内容的文件：

network:
  version: 2
  renderer: NetworkManager
  ethernets:
    enx00e04c680202:
      addresses:
        - 192.168.200.100/24
        - 169.254.1.100/24
      routes:
       - to: default
         via: 192.168.200.220
      nameservers:
        addresses:
          - 8.8.8.8   # Add your DNS server IP address
          - 8.8.4.4   # Add another DNS server IP address

并使用命令应用更改

sudo netplan apply

我用命令检查了配置ip address show dev enx00e04c680202，但似乎只应用了一个地址：

3: enx00e04c680202: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:4c:68:02:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.100/24 brd 192.168.200.255 scope global noprefixroute enx00e04c680202
       valid_lft forever preferred_lft forever

但其他配置的地址似乎有效！即使它没有随命令显示

ip address show dev enx00e04c680202

我能够连接到 IP 地址为 169.254.1.0 的设备，该设备仅连接到该以太网适配器。

enx00e04c680202当我使用以下命令向该适配器添加 IP 地址时

sudo ip addr add 169.254.1.100/24 dev enx00e04c680202

然后我看到命令的以下输出ip address show dev enx00e04c680202：

3: enx00e04c680202: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:4c:68:02:02 brd ff:ff:ff:ff:ff:ff
    inet 192.168.200.100/24 brd 192.168.200.255 scope global noprefixroute enx00e04c680202
       valid_lft forever preferred_lft forever
    inet 169.254.1.100/24 scope global enx00e04c680202
       valid_lft forever preferred_lft forever

它显示两个 IP 地址，而不仅仅是一个。也许这是一个错误ip address show？

networking
Martin Hope
Alex
Asked: 2023-12-20 15:44:39 +0800 CST
  • 7

例如，我用谷歌搜索并查看了此页面arp，我知道该命令应该显示互联网协议（IP）地址和媒体访问控制（MAC）地址之间的映射。

但当我在 22.04 ubuntu 系统上查看输出时，它对我来说没有意义。这里arp给出：

_gateway (192.168.107.172) at 3a:65:d4:6d:20:cf [ether] on wlp0s20f3

这里我假设有一个以太网适配器，其 MAC 地址3a:65:d4:6d:20:cf具有 IP 地址192.168.107.172。但是当我查看时，ifconfig我没有看到这个IP地址：

enp84s0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether 7c:57:58:80:1c:61  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 memory 0x54000000-540fffff  

enx00e04c680202: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.200.100  netmask 255.255.255.0  broadcast 192.168.200.255
        ether 00:e0:4c:68:02:02  txqueuelen 1000  (Ethernet)
        RX packets 124  bytes 11140 (11.1 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 28  bytes 2981 (2.9 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

enxa0cec8c97ebc: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether a0:ce:c8:c9:7e:bc  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

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 13849  bytes 1664000 (1.6 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 13849  bytes 1664000 (1.6 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp0s20f3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.107.238  netmask 255.255.255.0  broadcast 192.168.107.255
        inet6 fe80::6a85:ef4a:7e3c:be96  prefixlen 64  scopeid 0x20<link>
        inet6 2a01:cb16:2068:7c6c:8e00:94e:c979:548e  prefixlen 64  scopeid 0x0<global>
        inet6 2a01:cb16:2068:7c6c:d2f4:5a68:7bd8:e5d7  prefixlen 64  scopeid 0x0<global>
        ether 3c:e9:f7:a7:1c:0f  txqueuelen 1000  (Ethernet)
        RX packets 209228  bytes 203369040 (203.3 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 113025  bytes 26069725 (26.0 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

我看到列出的适配器arp（“wlp0s20f3”）的 IP 地址是 192.168.107.238，而不是 192.168.107.172！

我还使用了一个附加的 USB 以太网设备（“enx00e04c680202”），该设备未显示在 arp 列表中。USB 以太网适配器没有 MAC 地址吗？

我检查了各个页面这里和这里和这里没有答案......

networking
Martin Hope
Alex
Asked: 2023-10-27 20:54:21 +0800 CST
  • 6

在 ubuntu 22.04.2 中，我尝试读取来自串行端口的数据。为了找到正确的端口我做

sudo dmesg | grep tty

这使

[    0.117304] printk: console [tty0] enabled
[    0.793135] 0000:00:16.3: ttyS4 at I/O 0x3060 (irq = 19, base_baud = 115200) is a 16550A
[    4.136977] usb 3-6.3.2: FTDI USB Serial Device converter now attached to ttyUSB0
[27184.158691] ftdi_sio ttyUSB0: FTDI USB Serial Device converter now disconnected from ttyUSB0
[27190.409672] usb 3-6.3.2: FTDI USB Serial Device converter now attached to ttyUSB0

断开并重新连接 USB 设备后（时间 28180 左右）。然后根据这个建议我做

screen /dev/ttyUSB0 115200

但我得到的只是

[screen is terminating]

那么，如何尽可能简单地做到这一点，而无需设置配置、单击菜单或在命令行上浏览复杂的设置内容呢？我只想听一些来自该串行连接（通过 USB 连接到笔记本电脑）的信息。

在 Windows 上我可以使用

  • 术语
  • 油灰
  • MOBA xterm

但是在ubuntu上用什么呢？

command-line
Martin Hope
Alex
Asked: 2021-07-08 01:46:53 +0800 CST
  • 0

我在 MacOS 14.10.6 上运行 VirtualMachine (6.0.14)，在 VM 中安装了 Ubuntu 20.04。我想我已经安装了 Guest Additions，并且在Settings -> General -> Advanced我确实选择Bidirectional了 forShared Clipboard和Drag'n'Drop.

但是，当我使用 CTRL-C 或鼠标右键单击 -> 复制在主机系统 (MacOS) 中复制一些文本时，我无法将该文本粘贴到在 Virtualbox 中运行的客户端系统 (Ubuntu) 上的终端中 (鼠标右键单击都不起作用，CTRL-V也不起作用）。

我也尝试运行（见这里）：

sudo VBoxClient --clipboard

但这并没有解决我的问题。

内核模块似乎已加载，因为我从此命令获得了一些输出

lsmod | grep vboxguest

那我还能尝试什么？

20.04
Martin Hope
Alex
Asked: 2019-09-08 22:42:54 +0800 CST
  • 0

在 Ubuntu 18.04 中，我一直在运行memtester以测试硬件的 RAM。使用命令时

sudo memtester 100M 2

我得到一个退出代码

6

手册页中没有记录。那么eit代码是什么6意思呢？

ram memtest
Martin Hope
Alex
Asked: 2016-08-29 01:44:30 +0800 CST
  • 3

我正在使用Ubuntu 14.04并且我正在尝试Windows 10 Home使用Remmina. Windows 10 机器上似乎启用了远程连接（至少对于用户 [email protected]）。但是，无论我尝试连接（在本地网络 192.168.1.20 内）admin还是用户，[email protected]我总是会收到错误

Unable to connect to rdp server 192.168.1.20

在我尝试连接后 1-2 分钟后。我还尝试使用各种安全协议（TLS、RDP），并检查了目录~/.freerdp/，它是空的。

在互联网上搜索一些帮助我只找到了我已经尝试过的上述提示。还有什么我可以尝试解决这个问题的吗？

14.04
Martin Hope
Alex
Asked: 2016-05-28 00:42:13 +0800 CST
  • -1

我有一个 mkv 视频文件，其中包含以下内容：

> mkvmerge --identify original.mkv 
File 'original.mkv': container: Matroska
Track ID 0: video (V_MPEGH/ISO/HEVC)
Track ID 1: audio (AAC)
Tags for track ID 0: 7 entries
Tags for track ID 1: 7 entries

但是使用“标准”转换avconv不起作用，我在其他地方找到的建议也不起作用（见下文，下面......）。原始文件既不能通过连接到电视的硬盘驱动器播放，mplayer也不能从连接到电视的硬盘驱动器播放。

如何解决这些问题，以便将文件转换为更“正常/标准”的格式，以便mplayer在电视上播放？

> avconv  -i original.mkv  -vcodec copy -acodec aac -strict -2 -b:a 384k  output.mp4
avconv version 9.18-6:9.18-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
  built on Mar 16 2015 13:19:10 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
[matroska,webm @ 0x11d3200] Unknown/unsupported AVCodecID V_MPEGH/ISO/HEVC.
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 3 with DTS 209, packet 4 with DTS 167
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 4 with DTS 167, packet 5 with DTS 125
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 6 with DTS 292, packet 7 with DTS 250
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 8 with DTS 500, packet 9 with DTS 417
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 9 with DTS 417, packet 10 with DTS 334
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 13 with DTS 709, packet 14 with DTS 626
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 14 with DTS 626, packet 15 with DTS 542
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 18 with DTS 918, packet 19 with DTS 834
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 19 with DTS 834, packet 20 with DTS 751
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 23 with DTS 1126, packet 24 with DTS 1043
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 24 with DTS 1043, packet 25 with DTS 959
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 28 with DTS 1293, packet 29 with DTS 1210
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 29 with DTS 1210, packet 30 with DTS 1168
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 32 with DTS 1460, packet 33 with DTS 1376
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 33 with DTS 1376, packet 34 with DTS 1335
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 36 with DTS 1627, packet 37 with DTS 1543
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 37 with DTS 1543, packet 38 with DTS 1501
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 40 with DTS 1835, packet 41 with DTS 1752
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 41 with DTS 1752, packet 42 with DTS 1668
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 45 with DTS 2002, packet 46 with DTS 1919
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 46 with DTS 1919, packet 47 with DTS 1877
[matroska,webm @ 0x11d3200] Non-increasing DTS in stream 0: packet 49 with DTS 2211, packet 50 with DTS 2127
Input #0, matroska,webm, from 'original.mkv':
  Duration: 00:58:38.02, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: [0][0][0][0] / 0x0000, 1920x1080, PAR 255:254 DAR 680:381, 23.98 fps, 23.98 tbr, 1k tbn (default)
    Metadata:
      BPS             : 1242590
      BPS-eng         : 1242590
      DURATION        : 00:58:38.015000000
      DURATION-eng    : 00:58:38.015000000
      NUMBER_OF_FRAMES: 84348
      NUMBER_OF_FRAMES-eng: 84348
      NUMBER_OF_BYTES : 546431695
      NUMBER_OF_BYTES-eng: 546431695
      _STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_DATE_UTC: 2016-05-16 06:10:27
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-05-16 06:10:27
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0.1: Audio: aac, 48000 Hz, 5.1, fltp (default)
    Metadata:
      BPS             : 187584
      BPS-eng         : 187584
      DURATION        : 00:58:37.995000000
      DURATION-eng    : 00:58:37.995000000
      NUMBER_OF_FRAMES: 82453
      NUMBER_OF_FRAMES-eng: 82453
      NUMBER_OF_BYTES : 82490002
      NUMBER_OF_BYTES-eng: 82490002
      _STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_DATE_UTC: 2016-05-16 06:10:27
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-05-16 06:10:27
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
[mp4 @ 0x11daf60] track 0: could not find tag, codec not currently supported in container
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf54.20.4
    Stream #0.0: Video: [0][0][0][0] / 0x0000, 1920x1080 [PAR 255:254 DAR 680:381], q=2-31, 90k tbn, 1k tbc (default)
    Metadata:
      BPS             : 1242590
      BPS-eng         : 1242590
      DURATION        : 00:58:38.015000000
      DURATION-eng    : 00:58:38.015000000
      NUMBER_OF_FRAMES: 84348
      NUMBER_OF_FRAMES-eng: 84348
      NUMBER_OF_BYTES : 546431695
      NUMBER_OF_BYTES-eng: 546431695
      _STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_DATE_UTC: 2016-05-16 06:10:27
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-05-16 06:10:27
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0.1: Audio: aac, 48000 Hz, 5.1, fltp, 384 kb/s (default)
    Metadata:
      BPS             : 187584
      BPS-eng         : 187584
      DURATION        : 00:58:37.995000000
      DURATION-eng    : 00:58:37.995000000
      NUMBER_OF_FRAMES: 82453
      NUMBER_OF_FRAMES-eng: 82453
      NUMBER_OF_BYTES : 82490002
      NUMBER_OF_BYTES-eng: 82490002
      _STATISTICS_WRITING_APP: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_APP-eng: mkvmerge v7.8.0 ('River Man') 32bit built on Mar 27 2015 16:18:02
      _STATISTICS_WRITING_DATE_UTC: 2016-05-16 06:10:27
      _STATISTICS_WRITING_DATE_UTC-eng: 2016-05-16 06:10:27
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (aac -> aac)
Could not write header for output file #0 (incorrect codec parameters ?): Operation not permitted

我还尝试了以下命令：

avconv  -i original.mkv  -vcodec x264 -acodec aac -strict -2 -b:a 384k  output.mp4

这给出了以下错误：

Unknown encoder 'x264'

我还尝试了以下命令：

avconv  -i original.mkv  -vcodec libx264 -acodec aac -strict -2 -b:a 384k  output.mp4

这导致了这个错误：

[buffer @ 0x24adb00] Invalid pixel format string '-1'
Error opening filters!
video