I am getting a lot of these messages in my log:

Jun 25 04:02:11 BackupServer dhcpcd[1592]: br0: failed to renew DHCPv6, rebinding
Jun 25 04:02:19 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:02:20 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is reachable again
Jun 25 04:02:29 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:02:48 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:02:49 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is reachable again
Jun 25 04:02:58 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:03:27 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:04:49 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:07:32 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:12:58 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:12:59 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is reachable again
Jun 25 04:13:08 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:13:09 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is reachable again
Jun 25 04:13:17 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it
Jun 25 04:23:48 BackupServer dhcpcd[1592]: br0: fe80::d217:c2ff:feeb:d130 is unreachable, expiring it

Here is my network routing table:

 

 

The IPV6 address is my default gateway.  Is this a router and/or ISP problem?

 

backupserver-diagnostics-20170625-0434.zip

Edited June 25, 20179 yr by dlandon

More information.  The IPV6 address is the link-local address of my router:

Looks like your router disappears once a while from the local network.

 

I am a bit puzzled about your WAN and LAN addresses. You have enabled prefix-delegation (PD) which should let the router create LAN prefixes under the WAN prefix.

 

Your WAN prefix is 2605:a000:dfc0:5e/56 (I assume /56 but actually ISPs may use different sizes)

 

Your LAN prefix is 2605:a000:1317:a01a/64, which doesn't fall within the WAN prefix and if your router doesn't do any routing protocol with the ISP side, it will cause routing issues.

 

Did your router assign the LAN prefix itself or is this a manual action?

 

Ps. I do not have these kind of messages

Edited June 25, 20179 yr by bonienl

50 minutes ago, bonienl said:

Looks like your router disappears once a while from the local network.

 

I am a bit puzzled about your WAN and LAN addresses. You have enabled prefix-delegation (PD) which should let the router create LAN prefixes under the WAN prefix.

 

Your WAN prefix is 2605:a000:dfc0:5e/56 (I assume /56 but actually ISPs may use different sizes)

 

Your LAN prefix is 2605:a000:1317:a01a/64, which doesn't fall within the WAN prefix and if your router doesn't do any routing protocol with the ISP side, it will cause routing issues.

 

Did your router assign the LAN prefix itself or is this a manual action?

 

Ps. I do not have these kind of messages

 

The router assigned the LAN prefix itself.

I'm going to call this solved and write it off as a router issue.

 

EDIT: Rebooted the router and it cleared up the log messages.

Edited June 25, 20179 yr by dlandon