[Solved] Ds-lite auto-created interface is shutting down

Installing and Using OpenWrt
1

After restarting my router I'm not able to reconnect to IPv4 via dslite tunnel.

The router connects sucessfully to IPv6 via pppoe and dynamically creates the dslite-pppoe interface.
However, the dslite-pppoe never comes up succesfully.

From the logs I can see an infinite loop of

Thu Aug 10 15:42:25 2023 daemon.notice netifd: Interface 'DSL_6_4' is now down
Thu Aug 10 15:42:25 2023 daemon.notice netifd: Interface 'DSL_6_4' is setting up now
Thu Aug 10 15:42:34 2023 daemon.notice netifd: Interface 'DSL_6_4' is now down
Thu Aug 10 15:42:34 2023 daemon.notice netifd: Interface 'DSL_6_4' is setting up now
Thu Aug 10 15:42:43 2023 daemon.notice netifd: Interface 'DSL_6_4' is now down
Thu Aug 10 15:42:43 2023 daemon.notice netifd: Interface 'DSL_6_4' is setting up now
Thu Aug 10 15:42:53 2023 daemon.notice netifd: Interface 'DSL_6_4' is now down
Thu Aug 10 15:42:53 2023 daemon.notice netifd: Interface 'DSL_6_4' is setting up now
Thu Aug 10 15:43:02 2023 daemon.notice netifd: Interface 'DSL_6_4' is now down
Thu Aug 10 15:43:02 2023 daemon.notice netifd: Interface 'DSL_6_4' is setting up now

I already tried a tcpdump on the DSL interface to check whether the AFTR-adress is being advertised and it is.

Is there any way to debug this?

My network config:

config interface 'DSL'               
        option device 'eth0.7'    
        option ipv6 'auto'    
        option ip6ifaceid 'eui64'
        option peerdns '0'
        option proto 'pppoe'

Edit:
I found out that the dslite script fails when trying to resolve the peer address.
remoteip6=$(resolveip -6 "$peeraddr")
At the same time a warning is issued by dnsmasq:

Thu Aug 10 16:21:22 2023 daemon.warn dnsmasq[1]: Maximum number of concurrent DNS queries reached (max: 150)

Edit2:
That was indeed the key. For some reason the peerdns '0' option made it to my config, which seems to have had no harm until eventually I rebooted my system. Setting it to the (default) '1' value resolves my problem.

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