DHCP clients getting no IPv4 addresses on LAN

since a few days clients are not getting IPv4 addresses on LAN while on WLAN everything is fine. Also the static adresses for LXC are working properly.
Any help would be appreciated,

Hi all,
problem solved! Somehow I lost some definitions for the ethernet ports that they are allowed to communicate with each other. Once I found infos on “…vlan no traffic between ports…” the solution was like:
swconfig dev eth0 vlan 1 set ports "0 1 2 3 4 5"
swconfig dev eth0 set apply