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在 lo 上启用 multicast#

手动(临时解决方案)#

您只需调用以下命令即可在环回接口上启用组播.

sudo ip link set lo multicast on

警告

一旦计算机重新启动,这将恢复.要使其成为永久性的,请按照以下步骤作.

注意

这里,lo 是环回接口.

您可以使用 ip link show 检查接口.

您可以将 lo 更改为要启用多播的接口.

使用服务启动时(永久解决方案)#

sudo nano /etc/systemd/system/multicast-lo.service

将以下内容粘贴到文件中：

[Unit]
Description=Enable Multicast on Loopback

[Service]
Type=oneshot
ExecStart=/usr/sbin/ip link set lo multicast on

[Install]
WantedBy=multi-user.target

按以下键以使用 nano 保存：

  1. Ctrl+X
  2. Y
  3. Enter
# Make it recognized
sudo systemctl daemon-reload

# Make it run on startup
sudo systemctl enable multicast-lo.service

# Start it now
sudo systemctl start multicast-lo.service

驗證#

you@pc:~$ sudo systemctl status multicast-lo.service
○ multicast-lo.service - Enable Multicast on Loopback
     Loaded: loaded (/etc/systemd/system/multicast-lo.service; enabled; vendor preset: enabled)
     Active: inactive (dead) since Mon 2024-07-08 12:54:17 +03; 4s ago
    Process: 22588 ExecStart=/usr/bin/ip link set lo multicast on (code=exited, status=0/SUCCESS)
   Main PID: 22588 (code=exited, status=0/SUCCESS)
        CPU: 1ms

Tem 08 12:54:17 mfc-leo systemd[1]: Starting Enable Multicast on Loopback...
Tem 08 12:54:17 mfc-leo systemd[1]: multicast-lo.service: Deactivated successfully.
Tem 08 12:54:17 mfc-leo systemd[1]: Finished Enable Multicast on Loopback.

you@pc:~$ ip link show lo
1: lo: <LOOPBACK,MULTICAST,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

卸载服务#

如果出于某种原因您想要卸载该服务,您可以按照以下步骤进行作：

# Stop the service
sudo systemctl stop multicast-lo.service

# Disable the service from running on startup
sudo systemctl disable multicast-lo.service

# Remove the service file
sudo rm /etc/systemd/system/multicast-lo.service

# Reload systemd to apply the changes
sudo systemctl daemon-reload