It's urgent! Linux can't get online? Three-minute self-help guide. Finish the second

The scene is back:

Working late at night, knocking on the code, suddenly finding linux out of the net? The bottom-right network icon changes, the browser doesn't work. This babysitting program, hand in hand to bring you back to life

Step 1: check these low-level errors first

Is wifi really connected

2 ️⃣ net card "sealed"

Open terminal, enter:

Ip a # or ifconfig

If the online card name (e. G. Eth0, wlan0) does not have an ip address (e. G. 192. 168. X), it's not connected at all

Step 2: try "reactivate law"

Linux internet services sometimes take a turn at the top of the air and give the orders:

# most desktop versions apply
# the old system uses this

Ten seconds after restart, try to refresh the page

Firewall: did you do it

Linux's own firewall could have killed the network

Temporary help:

Sudo systeml stop firewall # off firewall (deactivated after restart)

Turning off the internet would make it clear that the rules were problematic and could be followed up by rules on release。

Dns configuration: losing is like making the wrong phone

Can't get through to the ip but can't get to the web page? Mostly dns solver failure

# test googledns

General read dns:

Driver problem: hardware does not recognize webcards

Especially in dual systems/new linux

Terminal input:

Lspci |grep-i net

If the driver is not installed (e. G., some realtek cards), the drive will have to be downloaded on disks or installed after the usb shared network。

Last resort: route watch repair

The network's working, but it's not working? Probably lost the route

Ip route show
# default gateway (to your router ip)

Summary:

Linux is out of his mind. Ninety percent of the problems can be solved by this procedure

Check physical connections, boom, restart services, turn off firewalls for dns, check drive/routing

Five minutes of operation. Web is back in place