Ethernet 1 losing ip address from isp router

[n0frills]

Hi all, I’m 4.7.4 beta on Flint 2 and have encountered an issue. My Flint 2 is connected to my ISP router via ethernet. Sometimes the flint 2 loses ip address on the ethernet connection (ethernet 1) and fails to get an ip address until I reboot it. In order to ensure no internet interruption I have connected to the same ISP router via wifi as repeater so that when ethernet loses ip address the connection fails over to the repeater. Issue happens about twice a week. The router isnot set to reboot automatically. The system logs are linked below.

TLDR: So the issue is Flint 2 losing Internet connection by randomly losing ip address from ISP router and can only be fixed by a reboot of the Flint 2.
Lan Failure logread.tar (256 KB)

[DaWeav]

When it happens, have you tried pulling the WAN Ethernet cable and reconnecting it to see if that works? If it does, then perhaps there’s a similar issue using the default 2.5Ghz WAN port with your ISP’s router like I had with the Brume 2’s 2.5Ghz WAN port.

The problem I had with the 2.5Ghz WAN port on the Brume 2 was that it wouldn’t get an IP after a reboot which is the opposite of your situation. So I ended up swapping the 2.5Ghz WAN port around with the 1Ghz LAN port which fixed it.

Brume 2 WAN port bootup issue

FIXED IT, but there's a GUI glitch. I swapped the WAN and LAN (BR-LAN) ports around. First, I opened the Advanced Settings GUI, and selected Network/Interfaces. Second, on the Interfaces Tab, I selected ‘edit’ on the WAN Interface and changed the Device from eth0 to eth1 and saved (NOT 'Save and Apply'). Third, I then selected the Devices Tab. On the Devices Tab, I selected ‘configure’ on the br-lan device. Then I selected the Bridge Ports dropdown where I unchecked eth1 and checkmarked eth…

[n0frills]

I tried replugging the cable but it didn't fix. Ethernet 2 is plugged to a 4g router that is used for backup when the ISP router experiences downtime.

[bruce]

Hello,

Checked the logs, it seems that the WAN port suddenly down (no reason is seen), and the WAN port will restart.
The udhcpc of the WAN port is sending discover, but the primary device (ISP Modem?) has no reply.

How about if other devices such as PC LANs connected to this primary level (ISP Modem) also have such a situation?

Not sure may be the 2.5Gbps port compatibility issue, but it is not very similar.

You can change the 2.5G WAN port of Flint2 to 1Gbps mode to test, SSH to router:

ethtool -s eth1 speed 1000 duplex full

If the port is running stable, it can be saved permanently:

sed -i '/exit 0/i\ethtool -s eth1 speed 1000 duplex full' /etc/rc.local

[n0frills]

Hi, thanks for the feedback. Other devices connected via wifi (Including Flint 2 repeater) have no issues. If it happens again, I will SSH to the router and change the 2.5G wan port to 1 Gbps as advised. I set Ethernet 1 DHCP to static on Flint 2 and disabled sending of ARP packets (I don't know what it does) in the ISP router to see. So far, it hasn't happened again.