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如何在具有多个互联网连接的 Linux 中切换互联网连接

tag-icon • tag-icon linux networking
如何在具有多个互联网连接的 Linux 中切换互联网连接

我正在使用 Arch Linux，

我有多个互联网连接：

一个是 wifi，另一个是 3G usb 调制解调器

首先我的 wifi 启动了，然后 3G 互联网启动了。网络管理器显示两者都已启动。但是 wifi 互联网正在使用中。现在我想使用 3G 调制解调器来做某事。

    Question1: How to switch to 3G internet using some command line command.

以下是来自网络管理器的连接信息。

  3G connection

  IP address: 10.178.202.42
  Broadcast Address: 10.179.255.255
  Subnet Mask: 255.252.0.0
  Primary DNS: 8.8.8.8


  WIFI Connection:

  IP address: 192.168.4.160
  Broadcast Address: 192.168.7.255
  Subnet Mask: 255.255.248.0
  Primary DNS: 192.168.0.1

我知道 wifi 正在被使用，因为我读到第一个连接将是默认连接。Question2: But how to check which is default using some command,

该命令的输出如下：

$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         0.0.0.0         0.0.0.0         U     0      0        0 wwan0
10.176.0.0      0.0.0.0         255.252.0.0     U     7      0        0 wwan0
192.168.0.0     0.0.0.0         255.255.248.0   U     9      0        0 wlan0

Question3: I cant understand what this output means. What is the difference beyween gateway and DNS

还有 ip 输出：

      $ ip a
      1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default 
      link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
      inet 127.0.0.1/8 scope host lo
        valid_lft forever preferred_lft forever
      inet6 ::1/128 scope host 
        valid_lft forever preferred_lft forever
      2: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000
      link/ether 00:1d:ba:07:87:98 brd ff:ff:ff:ff:ff:ff
      3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
      link/ether 00:21:5d:e8:77:3a brd ff:ff:ff:ff:ff:ff
      inet 192.168.4.160/21 brd 192.168.7.255 scope global wlan0
        valid_lft forever preferred_lft forever
      inet6 fe80::221:5dff:fee8:773a/64 scope link 
        valid_lft forever preferred_lft forever
      4: wwan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
      link/ether 02:15:75:3d:29:27 brd ff:ff:ff:ff:ff:ff
      inet 10.178.202.42/14 brd 10.179.255.255 scope global wwan0
        valid_lft forever preferred_lft forever
      inet6 fe80::15:75ff:fe3d:2927/64 scope link 
        valid_lft forever preferred_lft forever

我上面的输出是 inet 是什么：它显示一个“/”，例如在 wwan0 中：10.178.202.42/14。Question4: what does that 42/14 means.

答案1

route del default gw 192.168.4.160  
route add default gw 10.178.202.42

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