I have found the following exception in VDSM log: *MainProcess|jsonrpc/0::DEBUG::2017-01-24 10:13:50,303::supervdsm_server::101::SuperVdsm.ServerCallback::(wrapper) return network_caps with {'bridges': {'ovirtmgmt': {'ipv6autoconf': True, 'addr': '192.168.201.2', 'dhcpv6': False, 'ipv6addrs': [], 'gateway': '192.168.201.1', 'dhcpv4': True, 'netmask': '255.255.255.0', 'ipv4defaultroute': True, 'stp': 'off', 'ipv4addrs': ['192.168.201.2/24' <http://192.168.201.2/24'>], 'mtu': '1500', 'ipv6gateway': '::', 'ports': ['eth0'], 'opts': {'multicast_last_member_count': '2', 'hash_elasticity': '4', 'multicast_query_response_interval': '1000', 'group_fwd_mask': '0x0', 'multicast_snooping': '1', 'multicast_startup_query_interval': '3125', 'hello_timer': '15', 'multicast_querier_interval': '25500', 'max_age': '2000', 'hash_max': '512', 'stp_state': '0', 'topology_change_detected': '0', 'priority': '32768', 'multicast_membership_interval': '26000', 'root_path_cost': '0', 'root_port': '0', 'multicast_querier': '0', 'multicast_startup_query_count': '2', 'nf_call_iptables': '0', 'topology_change': '0', 'hello_time': '200', 'root_id': '8000.5452c0a8c902', 'bridge_id': '8000.5452c0a8c902', 'topology_change_timer': '0', 'ageing_time': '30000', 'nf_call_ip6tables': '0', 'gc_timer': '20299', 'nf_call_arptables': '0', 'group_addr': '1:80:c2:0:0:0', 'multicast_last_member_interval': '100', 'default_pvid': '1', 'multicast_query_interval': '12500', 'tcn_timer': '0', 'multicast_router': '1', 'vlan_filtering': '0', 'forward_delay': '0'}}}, 'bondings': {}, 'nameservers': ['192.168.201.1'], 'nics': {'eth3': {'ipv6autoconf': True, 'addr': '192.168.202.212', 'ipv6gateway': 'fe80::5054:ff:fe65:57d6', 'dhcpv6': False, 'ipv6addrs': [], 'mtu': '1500', 'dhcpv4': True, 'netmask': '255.255.255.0', 'ipv4defaultroute': False, 'ipv4addrs': ['192.168.202.212/24' <http://192.168.202.212/24'>], 'hwaddr': '54:52:c0:a8:ca:03', 'speed': 0, 'gateway': '192.168.202.1'}, 'eth2': {'ipv6autoconf': True, 'addr': '192.168.202.211', 'ipv6gateway': '::', 'dhcpv6': False, 'ipv6addrs': [], 'mtu': '1500', 'dhcpv4': True, 'netmask': '255.255.255.0', 'ipv4defaultroute': False, 'ipv4addrs': ['192.168.202.211/24' <http://192.168.202.211/24'>], 'hwaddr': '54:52:c0:a8:ca:02', 'speed': 0, 'gateway': '192.168.202.1'}, 'eth1': {'ipv6autoconf': True, 'addr': '192.168.200.143', 'ipv6gateway': '::', 'dhcpv6': False, 'ipv6addrs': [], 'mtu': '1500', 'dhcpv4': True, 'netmask': '255.255.255.0', 'ipv4defaultroute': False, 'ipv4addrs': ['192.168.200.143/24' <http://192.168.200.143/24'>], 'hwaddr': '54:52:c0:a8:c8:02', 'speed': 0, 'gateway': '192.168.200.1'}, 'eth0': {'ipv6autoconf': False, 'addr': '', 'ipv6gateway': '::', 'dhcpv6': False, 'ipv6addrs': [], 'mtu': '1500', 'dhcpv4': False, 'netmask': '', 'ipv4defaultroute': False, 'ipv4addrs': [], 'hwaddr': '54:52:c0:a8:c9:02', 'speed': 0, 'gateway': ''}}, 'supportsIPv6': True, 'vlans': {}, 'networks': {'ovirtmgmt': {'dhcpv6': False, 'iface': 'ovirtmgmt', 'ipv6autoconf': True, 'addr': '192.168.201.2', 'bridged': True, 'ipv6addrs': [], 'switch': 'legacy', 'gateway': '192.168.201.1', 'dhcpv4': True, 'netmask': '255.255.255.0', 'ipv4defaultroute': True, 'stp': 'off', 'ipv4addrs': ['192.168.201.2/24' <http://192.168.201.2/24'>], 'mtu': '1500', 'ipv6gateway': '::', 'ports': ['eth0']}}} ifup/VLAN100_Network::DEBUG::2017-01-24 10:13:53,048::commands::93::root::(execCmd) FAILED: <err> = 'Running scope as unit 0e9c5843-c89e-499b-9057-1d70ea366504.scope.\n/etc/sysconfig/network-scripts/ifup-eth: line 297: 16535 Terminated /sbin/dhclient ${DHCLIENTARGS} ${DEVICE}\nCannot find device "VLAN100_Network"\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\nDevice "VLAN100_Network" does not exist.\n'; <rc> = 1 ifup/VLAN100_Network::ERROR::2017-01-24 10:13:53,049::concurrent::189::root::(run) FINISH thread <Thread(ifup/VLAN100_Network, started daemon 140683650258688)> failed Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/vdsm/concurrent.py", line 185, in run ret = func(*args, **kwargs) File "/usr/lib/python2.7/site-packages/vdsm/network/configurators/ifcfg.py", line 910, in _exec_ifup _exec_ifup_by_name(iface.name <http://iface.name>;, cgroup) File "/usr/lib/python2.7/site-packages/vdsm/network/configurators/ifcfg.py", line 896, in _exec_ifup_by_name raise ConfigNetworkError(ERR_FAILED_IFUP, out[-1] if out else '') ConfigNetworkError: (29, 'Determining IPv6 information for VLAN100_Network... failed.')* Can someone please assist (logs for engine and vdsm [1])? [1] http://jenkins.ovirt.org/job/test-repo_ovirt_experimental_master/4935/art... Thanks Gil