artful: ubuntu@lp1718568-artful:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.3.5-3ubuntu2.2 amd64 DHCP client for automatically obtaining an IP address ii isc-dhcp-common 4.3.5-3ubuntu2.2 amd64 common manpages relevant to all of the isc-dhcp packages ubuntu@lp1718568-artful:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-artful:~$ sudo ip l show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff (on host): $ virsh domif-setlink lp1718568-artful vnet8 down Device updated successfully (back on guest): ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ no link-local IPv6 address for ens7 If you think you have received this message due to a bug rather than a configuration issue please read the section on submitting bugs on either our web page at www.isc.org or in the README file before submitting a bug. These pages explain the proper process and the information we find helpful for debugging.. exiting. after updating to -proposed: ubuntu@lp1718568-artful:~$ sudo ip l set down dev ens7 ubuntu@lp1718568-artful:~$ sudo ip l show ens7 3: ens7: mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000 link/ether 52:54:00:bf:16:8a brd ff:ff:ff:ff:ff:ff ubuntu@lp1718568-artful:~$ dpkg -l | grep isc-dhcp ii isc-dhcp-client 4.3.5-3ubuntu2.3 amd64 DHCP client for automatically obtaining an IP address ii isc-dhcp-common 4.3.5-3ubuntu2.3 amd64 common manpages relevant to all of the isc-dhcp packages ubuntu@lp1718568-artful:~$ sudo dhclient -v -6 ens7 Internet Systems Consortium DHCP Client 4.3.5 Copyright 2004-2016 Internet Systems Consortium. All rights reserved. For info, please visit https://www.isc.org/software/dhcp/ (blocks, waiting for ipv6 link-local addr) (on host): $ virsh domif-setlink lp1718568-artful vnet8 up Device updated successfully (back on guest): Listening on Socket/ens7 Sending on Socket/ens7 PRC: Soliciting for leases (INIT). XMT: Forming Solicit, 0 ms elapsed. XMT: X-- IA_NA 00:bf:16:8a XMT: | X-- Request renew in +3600 XMT: | X-- Request rebind in +5400 XMT: | X-- Request address 2001:db8::99. XMT: | | X-- Request preferred in +7200 XMT: | | X-- Request valid in +10800 XMT: Solicit on ens7, interval 1020ms. RCV: Advertise message on ens7 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:bf:16:8a RCV: | X-- starts 1520535276 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::99 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c RCV: Advertisement recorded. PRC: Selecting best advertised lease. PRC: Considering best lease. PRC: X-- Initial candidate 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c (s: 10105, p: 0). XMT: Forming Request, 0 ms elapsed. XMT: X-- IA_NA 00:bf:16:8a XMT: | X-- Requested renew +3600 XMT: | X-- Requested rebind +5400 XMT: | | X-- IAADDR 2001:db8::99 XMT: | | | X-- Preferred lifetime +7200 XMT: | | | X-- Max lifetime +7500 XMT: V IA_NA appended. XMT: Request on ens7, interval 940ms. RCV: Reply message on ens7 from fe80::5054:ff:fec9:897c. RCV: X-- IA_NA 00:bf:16:8a RCV: | X-- starts 1520535277 RCV: | X-- t1 - renew +3600 RCV: | X-- t2 - rebind +7200 RCV: | X-- [Options] RCV: | | X-- IAADDR 2001:db8::99 RCV: | | | X-- Preferred lifetime 604800. RCV: | | | X-- Max lifetime 2592000. RCV: X-- Server ID: 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c PRC: Bound to lease 00:01:00:01:22:2c:61:12:52:54:00:c9:89:7c. -proposed package verified