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WAN Interface State=UP Link=DOWN

My external monitor clued me into to two events this week with my SG105.  It has two WAN interfaces; ETH1 uses DHCP and ETH3 uses a static address.  Both are in the Active Interfaces box on the Interfaces > Uplink Balancing screen, ETH1 first, with ETH1 weighted at 90 and ETH3 at 10.  I have a DDNS entry that is successfully being updated to the ETH1 interface's address when things are normal.  During initial testing, I pulled the ETH1 interface and the system quickly detected the issue and registered the ETH3 static IP with DDNS as expected.  It also restored the interface and reverted the DDNS entry when I reconnected ETH1.  All good.

This week, the system appears to have detected some fault on ETH1 and failed it.  The first time was mid-weekday and I didn't have time to investigate so I disabled and re-enabled the ETH1 interface and everything reset back to normal.  It just happened again mid-day Saturday when I have more time to investigate before getting screams from users.  

The Dashboard page is indicating the State of ETH1 is Up but the Link is Down.  I SSH'd in and ifconfig shows the interface up with the same IP the provider always assigns.  I went poking through the logs and found entries in Fallback Messages.

2016:03:19-16:04:25 remote [daemon:info] nwd[30869]:  Interface eth1 is up but link is down 
2016:03:19-16:04:25 remote [daemon:info] nwd[30869]:  Interface eth1 has link down
2016:03:19-16:04:25 remote [daemon:info] nwd[30869]:  Writing into file  eth1: 0
2016:03:19-16:04:25 remote [daemon:info] nwd[30869]:  Executing Command /var/mdw/scripts/dhcpc renew eth1
2016:03:19-16:04:25 remote [daemon:info] irqd[5883]:  eth1 ether 00:1a:8c:zz:zz:zz <broadcast,multicast,up> group 0 
2016:03:19-16:04:37 remote [daemon:info] irqd[5883]:  eth1 ether 00:1a:8c:zz:zz:zz <broadcast,multicast,up,running,lowerup> group 0 
2016:03:19-16:04:37 remote [daemon:info] nwd[30869]:  Interface eth1 is up and link is back up  
2016:03:19-16:04:37 remote [daemon:info] nwd[30869]:  Interface eth1 has link up
2016:03:19-16:04:37 remote [daemon:info] nwd[30869]:  Writing into file  eth1: 1
2016:03:19-16:04:37 remote [daemon:info] nwd[30869]:  Executing Command /var/mdw/scripts/dhcpc renew eth1
2016:03:19-16:04:40 remote [daemon:info] dhcp_updown[28278]:  Installing IPv4 address: #.#.#.#/255.255.255.0

The address in the last line of the log is my typical ETH1 address so this looks good.  No idea why it thought it went down though.

I went ahead and disabled then re-enabled ETH1 again and everything recovered.  I'm looking for some guidance on a couple fronts.  First, where can I find more info on what happened?  Second, what does Status down but Link up indicate?  

Thanks in advance.



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