Hey,
I've an ER-Lite3 running. Until today, it has been running on 1.10.0, without any change or any trouble for a few months.
Today I updated it to 1.10.7, and after a reboot I was briefly able to access the Internet, but after SSH server and GUI became available, connectivity died.
My setup is pretty easy: ISP VDSL modem (FritzBox 7580) connected to eth0 (in router mode, so it does DHCP, NAT etc.).
It's LAN 1 is connected to the ER's eth0. eth1 is empty, eth2 is LAN (with one untagged and 3 tagged VLANs, only untagged in use ATM). ER's IP on eth0 is fixed, but I also tried DHCP, no difference.
So - update applied, rebooting ER. Internet works for ~1 minute, but when GUI + SSH become available, the ER turns dead on eth0.
It can still be accessed via eth2 without any issue.
I tried the following:
Connecting a laptop to LAN2 of FritzBox. Starting a ping to the IP of ER's eth0 interface.
It works for the first minute, but at some point the ER stops responding to ping. When the ARP entry on the laptop times out, it stops pinging, sends ARP requests. I can see all of that via
tcpdump -i eth0 -nn -B4096
ARP requests hit the ER, but it doesn't send out anything, it also does not respond to ping (on that interface). It just seems to be completely dead.
Did also check iptables, no DROP or REJECT matches, and all those entries have counters of 0.
I did not change any config before or after the update, and I rebooted the box multiple times, the behavior was consistent. I figured it had to do with the update, but couldn't find anything on the forums or in the release notes that seems to fit.
Therefore, I started to downgrade version by version. 1.10.7, .6 and .5 show the same behavior. After downgrade to .3, everything went back to normal, and it works again.
Before I sanitize my config, my question to the regulars here: Is any such behavior known or documented for those versions, or do you have any idea where to look?