i found a problem, the ubuntu image contains a fixed machine id file in /etc/machine-id so if you have many machines they all end up with same machine id.
this is really bad because dhcpv6 uses the machine id to generate a duid that is supposed to be unique across all hosts.
since it is not they overwrite each others ipv6 adress and screwup the ip and hostname generation in my dhcp server.
changing this is not trivial and ihave not found out how to do it.
apparently you are supposed to be able to do:
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# rm /etc/machine-id # systemd-machine-id-setup
so how do you reset the machine id properly so i can get dhcpv6 assigned adresses to not cause duplicates and in turn screwup glusterfs peer probe