Hoping someone can help me as i've been pulling out the only hair I have left (which is not much) trying to figure this out. I'm unable to assign multiple IPs to any CentOS 7 container, only the first adapter/IP works correctly. This only happens on RHEL (CentOS 7 specifically) containers. I do not have this issue with any Debian containers, which is what puzzles me so much about this. The only way I have been able to get the RHEL/CentOS containers to work with multiple IP addresses, is by using IP aliasing and manually adding the interface inside the container (as eth0:0 for example) http://docs.ovh.ca/en/guides-network-ipaliasing.html I also have to manually add the route in the host for it to work: Code: ip route add XXX.XXX.XXX.XXX dev vmbr0 Why doesn't the additional network interfaces work (for bridge mode)? Why do I have to manually add the route in the host container to get it to work correctly? Code: proxmox-ve: 4.4-84 (running kernel: 4.4.44-1-pve) pve-manager: 4.4-12 (running version: 4.4-12/e71b7a74) pve-kernel-4.4.35-2-pve: 4.4.35-79 pve-kernel-4.4.44-1-pve: 4.4.44-84 pve-kernel-4.4.19-1-pve: 4.4.19-66 lvm2: 2.02.116-pve3 corosync-pve: 2.4.2-2~pve4+1 libqb0: 1.0-1 pve-cluster: 4.0-48 qemu-server: 4.0-109 pve-firmware: 1.1-10 libpve-common-perl: 4.0-92 libpve-access-control: 4.0-23 libpve-storage-perl: 4.0-76 pve-libspice-server1: 0.12.8-2 vncterm: 1.3-1 pve-docs: 4.4-3 pve-qemu-kvm: 2.7.1-4 pve-container: 1.0-94 pve-firewall: 2.0-33 pve-ha-manager: 1.0-40 ksm-control-daemon: 1.2-1 glusterfs-client: 3.5.2-2+deb8u3 lxc-pve: 2.0.7-3 lxcfs: 2.0.6-pve1 criu: 1.6.0-1 novnc-pve: 0.5-8 smartmontools: 6.5+svn4324-1~pve80 zfsutils: 0.6.5.9-pve15~bpo80 Server is on OVH network, configured all IPs with virtual MAC in OVH manager interface. All debian based containers work fine with multiple IPs and network adapters, but for some reason any CentOS 7 containers will only work with the first IP added to the container. I tried using different failover IPs from other subnets, all without luck. I'm able to ping the main IP of the CentOS container from host node, but not able to ping any additional ones added from the host. Here's the `/etc/network/interfaces` file from host node: Code: # The loopback network interface auto lo iface lo inet loopback iface eth2 inet manual # for Routing auto vmbr1 iface vmbr1 inet manual post-up /etc/pve/kvm-networking.sh bridge_ports dummy0 bridge_stp off bridge_fd 0 # vmbr0: Bridging. Make sure to use only MAC adresses that were assigned to you. auto vmbr0 iface vmbr0 inet static address 149.x.x.155 netmask 255.255.255.0 network 149.x.x.0 broadcast 149.x.x.255 gateway 149.x.x.254 bridge_ports eth2 bridge_stp off bridge_fd 0 iface vmbr0 inet6 static address 2607:5300:0061:039b:: netmask 64 post-up /sbin/ip -f inet6 route add 2607:5300:0061:03ff:ff:ff:ff:ff dev vmbr0 post-up /sbin/ip -f inet6 route add default via 2607:5300:0061:03ff:ff:ff:ff:ff pre-down /sbin/ip -f inet6 route del default via 2607:5300:0061:03ff:ff:ff:ff:ff pre-down /sbin/ip -f inet6 route del 2607:5300:0061:03ff:ff:ff:ff:ff dev vmbr0 Here's the results of `ip link` in the guest (CentOS 7) container: Code: 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 84: eth0@if85: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT qlen 1000 link/ether 02:00:00:xx:xx:e9 brd ff:ff:ff:ff:ff:ff link-netnsid 0 86: eth1@if87: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT qlen 1000 link/ether 02:00:00:xx:xx:30 brd ff:ff:ff:ff:ff:ff link-netnsid 0 Here's the `/etc/sysconfig/network-scripts/ifcfg-eth0` file: Code: DEVICE=eth0 ONBOOT=yes BOOTPROTO=none IPADDR=167.xxx.xxx.214 NETMASK=255.255.255.255 GATEWAY=149.xxx.xxx.254 Here's the `/etc/sysconfig/network-scripts/ifcfg-eth1` file: Code: DEVICE=eth1 ONBOOT=yes BOOTPROTO=none IPADDR=167.xxx.xxx.215 NETMASK=255.255.255.255 GATEWAY=149.xxx.xxx.254 Is there something i'm missing here guys? I'm completely stumped by this one as it only appears to be an issue on RHEL (CentOS specifically) ... any suggestions, comments, or ideas to help troubleshoot this would be greatly appreciated! Thanks!