Hi Nick

I did a check, and it is all working, even during the RAID re-build.

Here is ifconfig, and as you can see, no errors on the LAN.
# ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 164.160.117.13 netmask 255.255.255.0 broadcast 164.160.117.255
inet6 fe80::215:17ff:fef5:5771 prefixlen 64 scopeid 0x20<link>
ether 00:15:17:f5:57:71 txqueuelen 1000 (Ethernet)
RX packets 74474337 bytes 82638133167 (76.9 GiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 41924422 bytes 25104426035 (23.3 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xb1c00000-b1c20000

enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255
inet6 fe80::215:17ff:fef5:5770 prefixlen 64 scopeid 0x20<link>
ether 00:15:17:f5:57:70 txqueuelen 1000 (Ethernet)
RX packets 41344264 bytes 34793688661 (32.4 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 79039357 bytes 110368518897 (102.7 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xb1a00000-b1a20000

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 1100883 bytes 451286454 (430.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1100883 bytes 451286454 (430.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

One thing i have seen, is that my LAN traffic had gone down, no tests, but just looking at my main switch, it seems to have a lot less traffic, if i look at the activity lights on the ports.
I still don't know what the issue was, but deleting the NIC's and re-creating them seems to have solved my LAN issue.
I still seem to have some issue as i see the WAN port NIC resetting - "e1000e 0000:00:19.0 enp0s25: Reset adapter unexpectedly"

Hi Nick

Did not have any joy last night, so started fresh this morning.
Had one issue with Samba not binding to my LAN, but i got that working.

And now... Confusion - no dropped packets, the only thing that changed, is that i deleted the NIC's and created them again???
As the RAID sync will run on Monday, i shall check again during the re-build and let you know

[root@ZodiacTech ~]# ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 164.160.117.13 netmask 255.255.255.0 broadcast 164.160.117.255
inet6 fe80::215:17ff:fef5:5771 prefixlen 64 scopeid 0x20<link>
ether 00:15:17:f5:57:71 txqueuelen 1000 (Ethernet)
RX packets 3471333 bytes 3822962566 (3.5 GiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 2323257 bytes 692975463 (660.8 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xb1c00000-b1c20000

enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255
inet6 fe80::215:17ff:fef5:5770 prefixlen 64 scopeid 0x20<link>
ether 00:15:17:f5:57:70 txqueuelen 1000 (Ethernet)
RX packets 12123515 bytes 11054494493 (10.2 GiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 19648934 bytes 28737993325 (26.7 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xb1a00000-b1a20000

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 33353 bytes 34555515 (32.9 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 33353 bytes 34555515 (32.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

I think you can just delete the NIC's in the IP Settings screen or console then re-configure them.

Hi Nick

It seems that my tinkering has "Broken" my system, i am now unable to connect via LAN.
How do i "Reset" my network settings to "Default"?

It is two On-Board LAN ports on a Intel Server Board S3420GP

That looks horrible. Do you have a faulty NIC or cable?

Hi Nick

1st i disables all IPV6 traffic - How do i disable IPv6 on CentOS 7 / RHEL 7
I used "Method 1"
There was a decrease in the IPV6 traffic.

I have done - ethtool -K enp2s0 tso off gso off - enp2S0 is my LAN interface, but using "?sbin/ifconfig" i still see a high amount of RX dropped packets.

# /sbin/ifconfig
enp0s25: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 164.160.117.13 netmask 255.255.255.0 broadcast 164.160.117.255
ether 00:15:17:f5:57:71 txqueuelen 1000 (Ethernet)
RX packets 103280603 bytes 93656896628 (87.2 GiB)
RX errors 0 dropped 8686 overruns 0 frame 0
TX packets 73582983 bytes 33164990293 (30.8 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xb1c00000-b1c20000

enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255
ether 00:15:17:f5:57:70 txqueuelen 1000 (Ethernet)
RX packets 92624763 bytes 47121247080 (43.8 GiB)
RX errors 0 dropped 29238641 overruns 0 frame 0
TX packets 74970205 bytes 92967305578 (86.5 GiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 16 memory 0xb1a00000-b1a20000

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
loop txqueuelen 1000 (Local Loopback)
RX packets 1784149 bytes 961081358 (916.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 1784149 bytes 961081358 (916.5 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Can you have a look at this thread and try turning off "tso"? I am not sure if the setting will survive a reboot of if it needs to be set every time you boot.

Hi Nick

The RAID is part of ClearOS
i have 10x 2TB drives setup as Raid6
1 separate drive for the ClearOS
1 separate drive for file transfers from Internet

No the LAN traffic is low, it is a 1Gb LAN, and when it "freeze" the tragic i have seen is between 10 to 15Mb on the LAN.
Here is the output
lspci -k | grep Eth -A 3
00:19.0 Ethernet controller: Intel Corporation 82578DM Gigabit Network Connection (rev 05)
Subsystem: Intel Corporation Device 34ec
Kernel driver in use: e1000e
Kernel modules: e1000e
--
02:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection
Subsystem: Intel Corporation Device 34ec
Kernel driver in use: e1000e
Kernel modules: e1000e

The only error i see, and it is repeated a few times is:
e1000e: enp0s25 NIC Link is Down
[16957.265929] e1000e 0000:00:19.0: irq 33 for MSI/MSI-X
[16957.366178] e1000e 0000:00:19.0: irq 33 for MSI/MSI-X
[16957.366347] IPv6: ADDRCONF(NETDEV_UP): enp0s25: link is not ready

I don't have any IPv6 settings on my network... as far as i know and "enp0s25" is my WAN port to the internet.

I have also seen this at the end of the report.

e1000e 0000:00:19.0 enp0s25: Reset adapter unexpectedly
[173637.874987] e1000e: enp0s25 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx
[173648.234370] e1000e 0000:00:19.0 enp0s25: Reset adapter unexpectedly
[173649.891026] e1000e: enp0s25 NIC Link is Up 100 Mbps Full Duplex, Flow Control: Rx

Have a look in your log files at that time. Is the RAID in ClearOS or separate (i.e. is there much LAN traffic)?

What is the output from:

lspci -k | grep Eth -A 3

If you get a chance, before you reboot, can you type the command "dmesg" and look for errors, probably near the bottom.