Hi, Sorry of this is the wrong list, trying to find some help. I am trying to set up 2 KVM hosts using Debian 9 (connecting to a 3 node Centos 7.4 gluster cluster) To get the bandwidth I have bonded 2 NICS each end. However while the network works fine for the Debian VM host the VM guests cannot connect/get an IP using DHCP connecting to br0. (Same setup on the Centos end works fine however) On the Debian host if I connect to br1 which is a bridge to a NIC port it works fine. My problem then seems to be at the bonding layer for libvirt/kvm ? Here is my interfaces config, I cannot see the problem. The VM guest is on the gluster cluster and boots fine just no networking. any ideas what I am doing wrong pls? or a better group/list to go ask in? auto eno1 iface eno1 inet manual #iface eno1 inet static bond-master bond0 #address 192.168.1.62 #netmask 255.255.255.0 #gateway 192.168.1.1 #dns-nameservers 192.168.1.241 192.168.1.104 # mtu 9000 auto enp1s0f1 iface enp1s0f1 inet manual bond-master bond0 # mtu 9000 auto bond0 iface bond0 inet static bond-miimon 100 bond-mode 6 bond-updelay 200 bond-xmit_hash_policy layer3+4 bond-lacp-rate 1 # mtu 9000 # address 192.168.1.62 # netmask 255.255.255.0 # gateway 192.168.1.1 # dns-nameservers 192.168.1.241 192.168.1.104 slaves eno1 enp1s0f1 auto br0 iface br0 inet static address 192.168.1.62 netmask 255.255.255.0 gateway 192.168.1.1 dns-nameservers 192.168.1.241 192.168.1.104 bridge_ports bond0 #bridge_ports eno1 enp1s0f1 bridge_stp on bridge_fd 0.0 # mtu 9000 #post-up ifconfig bond0 mtu 9000 #post-up ip link set dev bond0 mtu 9000 #auto bond1 #iface bond1 inet static # address 10.100.200.62 # netmask 255.255.255.0 # bond_slaves enp3s0f1 # bond_primary enp3s0f1 # mtu 9000 auto br1 iface br1 inet static address 10.100.200.62 netmask 255.255.255.0 gateway 10.100.200.1 bridge_ports enp3s0f1 bridge_stp on bridge_fd 0.0 root@kvm02:/etc/network#