Hi Sonic´╝î

I think the FORWARD chain might drop your packets sent to flannel.

>
> Chain FORWARD (policy DROP)
> target     prot opt source               destination
> DOCKER-ISOLATION  all  --  anywhere             anywhere
> ACCEPT     all  --  anywhere             anywhere             ctstate
> RELATED,ESTABLISHED
> DOCKER     all  --  anywhere             anywhere
> ACCEPT     all  --  anywhere             anywhere
> ACCEPT     all  --  anywhere             anywhere
> ACCEPT     all  --  anywhere             anywhere             ctstate
> RELATED,ESTABLISHED
> ACCEPT     all  --  anywhere             anywhere
> FORWARD_direct  all  --  anywhere             anywhere
> FORWARD_IN_ZONES_SOURCE  all  --  anywhere             anywhere
> FORWARD_IN_ZONES  all  --  anywhere             anywhere
> FORWARD_OUT_ZONES_SOURCE  all  --  anywhere             anywhere
> FORWARD_OUT_ZONES  all  --  anywhere             anywhere
> DROP       all  --  anywhere             anywhere             ctstate
> INVALID
> REJECT     all  --  anywhere             anywhere             reject-with
> icmp-host-prohibited
>

Try change the default rule to ACCEPT and see if it works.

Regards,
Adieu

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