Ask Your Question

Unstable network after upgrading from 28 to 29

asked 2018-12-04 04:25:38 -0500

Peter Nguyen gravatar image

updated 2018-12-04 11:45:40 -0500

After upgrade from 28 to 29, network becomes unstable but i am not able to find any error in kernel log. Surprisingly, ifconfig show no error in network stats.

Ping output to another machine in local network shows missing packages
PING ( 56(84) bytes of data.
64 bytes from icmp_seq=7 ttl=64 time=0.668 ms
64 bytes from icmp_seq=8 ttl=64 time=0.656 ms
64 bytes from icmp_seq=9 ttl=64 time=0.688 ms

enp4s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet  netmask  broadcast
        inet6 fe80::23c0:cc5f:8b02:15d1  prefixlen 64  scopeid 0x20<link>
        ether 9c:5c:8e:bc:32:57  txqueuelen 1000  (Ethernet)
        RX packets 10701915  bytes 14632554858 (13.6 GiB)
        RX errors 0  dropped 0  overruns 47  frame 0
        TX packets 3677904  bytes 3631365422 (3.3 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device memory 0xdf200000-df21ffff  

lspci output (only 1 card is used)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-V
04:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network Connection (rev 03)

I tried the following methods but none of them worked
 - Disable firewall
 - Change RX and TX size via ethtool
 - Downgrade kernel from 4.19 to 4.18
 - Use USB network card
 - Disable NetworkManager

Hardware is unlikely to be the issue as there is no problem with Ubuntu 18.06 (Live USB)
edit retag flag offensive close merge delete

1 Answer

Sort by ยป oldest newest most voted

answered 2018-12-04 12:06:19 -0500

ed209 gravatar image

Your interface does not appear to make always linux happy: You could try using intel drivers

The firewall has nothing to do with such problems. Besides that, a couple of questions: 1) Are you sure the cables and switches are ok? 2) How do you know it's not the other computer dropping packets?

edit flag offensive delete link more


1) Cables are switches are OK. I had no issue when running Ubuntu on the same machine 2) I disabled firewall on the other machine. I can't see any reason for it to drop packets

The active NIC is I211 with ibg driver. It has been working for the last two years until i upgraded to fedora 29.

Peter Nguyen gravatar imagePeter Nguyen ( 2018-12-04 13:20:33 -0500 )edit

Actually you have overruns, not dropped packets. Even with another card, it seems. Check out the system buffers with grep . /proc/sys/net/ipv4/tcp*mem and try increasing them. If not effective you should file a bug to bugzilla.

ed209 gravatar imageed209 ( 2018-12-04 19:03:30 -0500 )edit

hardware....ok.... or not? some reason has a network problem. i have been experience man case cannot access network in system. 1. Hardware Problem...Lan Cable..or Router some connector or do not support driver! 2. Software Problem....Many...reason make a problem. Fedora - Firewall System and Wifi Connection firewalld zone Network Sometime Block your System - Secure other service running. H/w Don't Support your good....but it doesn't run a complete status... take care.... written by simmon

simmon gravatar imagesimmon ( 2018-12-04 20:23:06 -0500 )edit

There is no overrun with USB card. Now I suspect it has no thing to do with network. It's getting worse. I'm experiencing intermittent freeze. When the screen is locked, it takes several seconds to respond to mouse or keyboard.

Peter Nguyen gravatar imagePeter Nguyen ( 2018-12-04 20:46:41 -0500 )edit

...try to install NetwrokManager and nettools normally USB Network Card...good run and easy use system. what kind type ..usb card?

dnf -y install NetworkManager* net*tools

systemctl enable NetworkManager

systemctl start NetworkManager

my system running service NetworkManager.....can be check system aid for network status. written by simmon

simmon gravatar imagesimmon ( 2018-12-04 22:16:01 -0500 )edit

Question Tools


Asked: 2018-12-04 04:25:38 -0500

Seen: 586 times

Last updated: Dec 04 '18