I have multiple DHCPv6 based wan interfaces to work around an ISP limitation, see this post, however in setting up 2 DHCPv6 wan interfaces they seem to reset every hour or so which I assume is roughly when the DHCP lease expires. If they're both tied to eth3
then only the older one(has longer uptime) goes down and never comes back up, if one is an alias of the other then they both go down and both come back up but interrupt internet service in the process. Disabling one of the WANs fixes the issue but limits me to only one LAN network. I've attached the relevant snippet from the OpenWRT syslog.
Sun Aug 4 12:04:48 2019 daemon.warn odhcpd[1984]: A default route is present but there is no public prefix on br-lan thus we don't announce a default route!
Sun Aug 4 12:04:48 2019 daemon.notice hostapd: wlan0: AP-STA-DISCONNECTED 64:bc:0c:51:02:63
Sun Aug 4 12:04:52 2019 daemon.info hostapd: wlan0: STA 64:bc:0c:51:02:63 IEEE 802.11: authenticated
Sun Aug 4 12:04:52 2019 daemon.info hostapd: wlan0: STA 64:bc:0c:51:02:63 IEEE 802.11: associated (aid 1)
Sun Aug 4 12:04:52 2019 daemon.notice hostapd: wlan0: AP-STA-CONNECTED 64:bc:0c:51:02:63
Sun Aug 4 12:04:52 2019 daemon.info hostapd: wlan0: STA 64:bc:0c:51:02:63 RADIUS: starting accounting session A7300141873B6D21
Sun Aug 4 12:04:52 2019 daemon.info hostapd: wlan0: STA 64:bc:0c:51:02:63 WPA: pairwise key handshake completed (RSN)
Sun Aug 4 12:04:53 2019 daemon.warn odhcpd[1984]: A default route is present but there is no public prefix on br-lan thus we don't announce a default route!
Sun Aug 4 12:05:08 2019 daemon.notice netifd: Interface 'wan6' has lost the connection
Sun Aug 4 12:05:09 2019 daemon.notice netifd: Interface 'guest_wan' is now down
Sun Aug 4 12:05:09 2019 daemon.notice netifd: Network alias '' link is down
Sun Aug 4 12:05:09 2019 daemon.notice netifd: Interface 'guest_wan' has link connectivity loss
Sun Aug 4 12:05:09 2019 daemon.notice netifd: Interface 'guest_wan' is disabled
Sun Aug 4 12:05:20 2019 daemon.notice netifd: Interface 'guest_wan' is enabled
Sun Aug 4 12:05:20 2019 daemon.notice netifd: Network alias 'eth3' link is up
Sun Aug 4 12:05:20 2019 daemon.notice netifd: Interface 'guest_wan' has link connectivity
Sun Aug 4 12:05:20 2019 daemon.notice netifd: Interface 'guest_wan' is setting up now
Sun Aug 4 12:05:20 2019 daemon.notice netifd: Interface 'wan6' is now up
Sun Aug 4 12:05:20 2019 user.notice firewall: Reloading firewall due to ifup of wan6 (eth3)
Sun Aug 4 12:05:21 2019 daemon.notice netifd: Interface 'guest_wan' is now up
Sun Aug 4 12:05:21 2019 user.notice firewall: Reloading firewall due to ifup of guest_wan (eth3)