Black screen on wired connection via router

[zugunder]

Hi,
I have recently faced a problem connecting to the Internet via my old router, but if i bypass it, connection is established without any problems. Another machine I run here with Scientific Linux does connect via router without any glitches and works OK.

The connection settings for wired network are default. After I plug the cable into the router nothing happens (no activity in the tray icon), but after ~30 sec I get a black screen. Ctrl+Alt+Backspace do not work, I can only try to send the system to sleep and wake it up after that to get to the desktop. However, Network center freezes completely.

If I completely disable the Firewall in MCC, right after plugging in of the network cable into the router I see an activity on the tray icon for a couple of seconds, then it returns back to "not connected", but no black screen appears. If I attempt to connect manually via the Network Center, black screen appears again. Sleep -> Wake Up works, but when I close the Network Center, its icon disappears from the tray and some applets (like CPU load meter) freeze. Though the system seems to be OK, Logout/Restart do not work.

So it looks to me that a glitch in the Network Center (but not in Farewall) screws up the whole DE.

There is no MAC filtering set in the router, only its firewall and ping discard.

I'd like to use the router as I did before, so I appreciate any help.

Mageia3 KDE x64, wired connection - Qualcomm Atheros AR8121/AR8113/AR8114 Gigabit or Fast Ethernet

Thank you.

[wintpe]

as the desktop in linux is based on X and X is a networked window system,
i would take a guess that the settings that are comming from your router are interfering in some way.

as soon as you plug in the network, i would assume the hardwired network has been configured for dhcp.

this is then applying network settings to your mageia desktop from the router and in some way setting
it in such a way that is incompatible with the desktop.

to have a clue whats happening need to see your network settings before and after.

this may be difficalt, as once system freezes you cant get in.

but if you can at least run a few commands and then write them via another computer to this forum we may be able to help more.

you will need before and after for the following commands as root.

ifconfig -a

netstat -rn

cat /etc/resolv.conf

grep -i dhcp /var/log/messages

regards peter

[doktor5000]

grep -i dhcp /var/log/messages

That won't work with systemd/journal. Better use

Code: Select all

journalctl -b | grep -i dhcp

as root to show all dhcp messages since last boot or use

Code: Select all

systemctl status network.service -n 50

as root which will show status of network service and last 50 lines of network log.