Hi, i have a strange behavior on my linux system and can not explain it. Help would be greatly appreciated. host proxmox1 with a trunk/bond interface to Cisco-Switch. proxmox1 has mgmt in vlan100 on same bond: bond1.100@bond1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 3c:fd:fc:9a:7d:cc brd ff:ff:ff:ff:ff:ff inet 10.64.253.203/24 brd 10.64.253.255 scope global bond1.100 All is fine and proxmox1 is reachable from other machines through vlan 100. The routing between the vlans, is done by a pfsense firewall on _another_ proxmox-node. Now instantly when i move the firewall to proxmox1-host, the proxmox1 host is not reachable through mgmt-vlan 100 anymore. Ideas? Thank you