Arch Linux

rkba

Member

Registered: 2023-09-04

Posts: 15

Network keeps dropping off

My network drops out at random times, sometimes after a few minutes, sometimes it stays working for a few hours. The only way I know how to fix it is to reboot which is very annoying to have to keep reopening all the apps I had open and re-logging in. When it's working it looks like this:

 enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group d>
    link/ether 18:60:24:e4:14:0e brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.172/24 brd 192.168.1.255 scope global dynamic noprefixroute >
       valid_lft 86364sec preferred_lft 86364sec
    inet 192.168.1.173/24 brd 192.168.1.255 scope global secondary dynamic nopr>
       valid_lft 86370sec preferred_lft 75570sec
    inet6 2600:6c65:717f:5ba5:b7b7:36eb:1ba5:e9b8/64 scope global dynamic nopre>
       valid_lft 565020sec preferred_lft 565020sec
    inet6 2600:6c65:717f:5ba5:dff9:522d:2bb3:6d54/64 scope global dynamic mngtm>
       valid_lft 565019sec preferred_lft 565019sec
    inet6 fe80::f3:4865:ecc6:1f01/64 scope link noprefixroute
       valid_lft forever preferred_lft forever
    inet6 fe80::3cff:42ee:fcfb:b24e/64 scope link
       valid_lft forever preferred_lft forever

then when it's not working it looks like this:

enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group >

It says "UP" but there's no address and says "NO-CARRIER". What's going on? Why does it do this? What can I do to make it stop doing this? And how can I bring it back up without rebooting? It does it sometimes when installing software with pacman. The download speed drops less and less then disconnects. I'm using NetworkManager not dhcpcd.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,099

Re: Network keeps dropping off

Cable. Loose, broken or undergraded. There're btw plugs on both ends.

On the *rare* chance that it's not the cable (*very* *VERY* rare chance) please post the system journal of an affected boot

sudo journalctl -b -1 | curl -F 'file=@-' 0x0.st

for the previous one.

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

dhzalol

Member

Registered: 2023-09-12

Posts: 9

Re: Network keeps dropping off

is it network-manager? or copied from iso

rkba

Member

Registered: 2023-09-04

Posts: 15

Re: Network keeps dropping off

I swapped cables with a working system and that system is working fine with that cable, this system still having problems with a known good cable.

http://0x0.st/HOmm.txt

rkba

Member

Registered: 2023-09-04

Posts: 15

Re: Network keeps dropping off

is it network-manager? or copied from iso

I don't know what this means.

Raynman

Member

Registered: 2011-10-22

Posts: 1,539

Re: Network keeps dropping off

I'm using NetworkManager not dhcpcd.

journal shows both, so you probably want to disable dhcpcd.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,099

Re: Network keeps dropping off

Since it's a single ethernet connection, dhcpcd would suffice.
There's also an onslaught of failing attempts to start systemd-resolved…

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc