How can I switch between Wireless and Wired on a laptop?

Gladuin · n00b Joined: 25 Jul 2018 Posts: 4

Hello,

My laptop has two networking interfaces, Wired (enp8s0) and Wireless (wlp9s0). I got those both to work but the problem is that when I plug in my ethernet cable, wlp9s0 is still up so I have two IP adresses. My question is, How can I bring wlp9s0 down when I plug in my ethernet cable?

Thanks for the help!

Anon-E-moose · Posted: Wed Jul 25, 2018 6:56 pm Post subject:

I've set mine up so neither comes up automatically.

then I have aliases for bringing wpa up and down, and the ethernet up and down.

I don't have the laptop turned on at the moment, when I do later I'll see exactly how I've set it up.
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John R. Graham · Posted: Wed Jul 25, 2018 8:01 pm Post subject:

See sys-apps/ifplugd. Does exactly what you're asking for and works like a charm.

(Just pay no attention to the name of the author.

)

- John
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UberLord · Posted: Wed Jul 25, 2018 8:46 pm Post subject:

Why not go one better and have both up? That way, wireless takes over instantly when the ethernet is unplugged.
You also get the option of sharing the same IP address on both interfaces if you're so inclined.

https://wiki.gentoo.org/wiki/Network_management_using_DHCPCD
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Anon-E-moose · Posted: Wed Jul 25, 2018 8:49 pm Post subject:

John R. Graham · Posted: Wed Jul 25, 2018 8:54 pm Post subject:

UberLord · Posted: Wed Jul 25, 2018 9:00 pm Post subject:

Well, that's why you have a nice toggle for wireless on/off (assuming a decent laptop).
But that's a hardware thing - software side you just set all go.

If you want a software switch you still set all go but just bring up or down the wireles interface:
ifconfig wlan0 down
ifconfig wan0 up

You could even script that as a dhcpcd exit hook if you wanted something portable across a variety of OS's

Simplez

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Use dhcpcd for all your automated network configuration needs
Use dhcpcd-ui (GTK+/Qt) as your System Tray Network tool

Gladuin · n00b Joined: 25 Jul 2018 Posts: 4

Gladuin · n00b Joined: 25 Jul 2018 Posts: 4

Anon-E-moose · Posted: Thu Jul 26, 2018 2:34 pm Post subject:

I do not have net.eth0, net.wlan0 or wpa_supplicant set to boot as services.

Gladuin · n00b Joined: 25 Jul 2018 Posts: 4

I have come up with something myself.

I disabled all interfaces from starting up and I removed wpa_supplicant from boot. I only left dhcpcd to start on boot because then the IP adresses get assigned automatically when I bring an interface up.

I also made these scripts:
for starting my wireless interface
for starting my wired interface

If I can improve something on them, please tell me :wink:

steveL · Posted: Fri Aug 24, 2018 3:12 pm Post subject: