all dockers lost external dns on custom network

i have been running my custom network for over 1,5 year now without issues as created by ibracorp method.

since yesterday however the external dns function for all my dockers stopped working.

i tried everything in the docker settings to get it working again.. i just dont know what else to try.

current settings docker:

Docker custom network type:

ipvlan

Host access to custom networks:

Disabled

Preserve user defined networks:

Yes

pinging to an ip works without issue, its just name resolving..

sh-5.2# ping nu.nl
ping: nu.nl: Temporary failure in name resolution
sh-5.2# ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=118 time=6.68 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=118 time=6.99 ms

for example authelia now says:
{"error":"failed to dial connection: dial tcp: lookup smtp.gmail.com: i/o timeout","level":"error","msg":"Error occurred running a startup check","provider":"notification","time":"2024-05-15T13:51:52+02:00"}
{"error":"error occurred during dial: dial udp: lookup time.cloudflare.com on 127.0.0.11:53: server misbehaving","level":"warning","msg":"Could not determine the clock offset due to an error","time":"2024-05-15T13:52:16+02:00"}
{"level":"fatal","msg":"One or more providers had fatal failures performing startup checks, for more detail check the error level logs","providers":["notification"],"stack":[{"File":"github.com/authelia/authelia/v4/internal/commands/root.go","Line":150,"Name":"doStartupChecks"},{"File":"github.com/authelia/authelia/v4/internal/commands/root.go","Line":88,"Name":"(*CmdCtx).RootRunE"},{"File":"github.com/spf13/[email protected]/command.go","Line":983,"Name":"(*Command).execute"},{"File":"github.com/spf13/[email protected]/command.go","Line":1115,"Name":"(*Command).ExecuteC"},{"File":"github.com/spf13/[email protected]/command.go","Line":1039,"Name":"(*Command).Execute"},{"File":"github.com/authelia/authelia/v4/cmd/authelia/main.go","Line":10,"Name":"main"},{"File":"runtime/internal/atomic/types.go","Line":194,"Name":"(*Uint32).Load"},{"File":"runtime/asm_amd64.s","Line":1695,"Name":"goexit"}],"time":"2024-05-15T13:52:16+02:00"}