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Topic # 248219 15-Mar-2019 09:36
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Hi,

 

Having a bizarre issue between my fibre ONT, and my EdgeRouter, in which eth0 seems to drop link from the ONT for 2 seconds or so. Due to the drop, I don't seem to be having 'drop-outs' as such, however am getting the odd ping drop, which I'd expect. Logs show the following:

 

Mar 14 01:42:59 rtr01 kernel: eth0: Link down
Mar 14 01:43:01 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 14 01:53:57 rtr01 kernel: eth0: Link down
Mar 14 01:53:59 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 14 07:09:21 rtr01 kernel: eth0: Link down
Mar 14 07:09:23 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 14 18:38:58 rtr01 kernel: eth0: Link down
Mar 14 18:39:00 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 14 20:16:36 rtr01 kernel: eth0: Link down
Mar 14 20:16:38 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 14 21:24:33 rtr01 kernel: eth0: Link down
Mar 14 21:24:35 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 15 06:05:55 rtr01 kernel: eth0: Link down
Mar 15 06:05:57 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 15 06:57:49 rtr01 kernel: eth0: Link down
Mar 15 06:57:51 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0
Mar 15 08:52:41 rtr01 kernel: eth0: Link down
Mar 15 08:52:43 rtr01 kernel: eth0: 1000 Mbps Full duplex, port 0

 

Anyone come across this before, and if so, how did you manage to fix this? I have run proper testing across the Cat6 run between the ONT and the EdgeRouter, with nothing of note coming from this. Possible issue with the ONT port?

 

 

 

Cheers


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  Reply # 2198434 15-Mar-2019 10:06
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That's a little weird...  we only have one and someone else worked on it... but I'd run with the basics first, in no particular order.

 

- temporarily move the ERL to beside the ONT and use a known good machine made short cable.

 

- Force the ERL's ethernet port to 100mb half duplex mode and see if the connection is stable.  100mb ethernet uses only 4 wires whereas gigabit uses all 8 and this might indicate a cabling problem.... perhaps a connection that is close to perfect but not quite.





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  Reply # 2198437 15-Mar-2019 10:13
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Continuity testers don't do proper testing.


 
 
 
 




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  Reply # 2198442 15-Mar-2019 10:15
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Spyware:

 

Continuity testers don't do proper testing.

 

 

Cable has been tested with DSX series Fluke kit. I understand continuity testers don't do proper testing :).


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  Reply # 2198541 15-Mar-2019 12:54
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Dynamic:

 

- Force the ERL's ethernet port to 100mb half duplex mode and see if the connection is stable.  100mb ethernet uses only 4 wires whereas gigabit uses all 8 and this might indicate a cabling problem.... perhaps a connection that is close to perfect but not quite.

 

 

Unless you can change the ONT to 100/half as well that's generally not a good idea.




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  Reply # 2198551 15-Mar-2019 13:13
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vulcannz:

 

Dynamic:

 

- Force the ERL's ethernet port to 100mb half duplex mode and see if the connection is stable.  100mb ethernet uses only 4 wires whereas gigabit uses all 8 and this might indicate a cabling problem.... perhaps a connection that is close to perfect but not quite.

 

 

Unless you can change the ONT to 100/half as well that's generally not a good idea.

 

 

Yeah, I've seen issues with previous customers who have had gear misconfigured, and cause hell issues with the ONT trying to auto/auto and the CPE just having a complete melt down.

 

The Fritz!Box was setup the exact same way, and it didn't exhibit the same issue, so I'm wondering if eth0 is flapping for a short period of time at sporadic intervals. I may reconfigure WAN onto eth2 and see how that goes.


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  Reply # 2198553 15-Mar-2019 13:17
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Temporally change your config so that you are using Eth 1 or 2 for Wan instead of Eth 0. And see if you still get the same fault or not.

Do you also get PPP drop or DHCP renewals on the WAN also?

Assuming that you are in a chorus area, their ONTs drop the Ethernet link if the optical link drops. Maybe setup a camera recording the status lights on the ONT, and see what happens next time a drop occurs.







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  Reply # 2198556 15-Mar-2019 13:22
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Aredwood: Temporally change your config so that you are using Eth 1 or 2 for Wan instead of Eth 0. And see if you still get the same fault or not.

Do you also get PPP drop or DHCP renewals on the WAN also?

Assuming that you are in a chorus area, their ONTs drop the Ethernet link if the optical link drops. Maybe setup a camera recording the status lights on the ONT, and see what happens next time a drop occurs.

 

Definitely doesn't have to redial PPPoE or renew v6, so it doesn't actually seem like it is dropping optical, but a good plan none the less. As per my post just above yours, I think I will reconfigure eth2 to be WAN, and go from there, process of elimination.

 

Edit: Definitely in Chorus fibre area (AKL based).


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