We have the same problem without bond configured. After upgrading to systemd 229-4ubuntu20 NOARP is set to our network interfaces. The machine has two network interfaces and the configuration is very simple:
# 50-ens5f0.network [Match] MACAddress=24:8a:7:11:50:a8 [Link] MTUBytes=9000 [Network] Address=10.32.34.34/30 DHCP=no LinkLocalAddressing=no IPv6AcceptRA=no # 50-ens5f1.network [Match] MACAddress=24:8a:7:11:50:a9 [Link] MTUBytes=9000 [Network] Address=10.32.33.126/30 DHCP=no LinkLocalAddressing=no IPv6AcceptRA=no # ip link 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 2: ens5f0: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000 link/ether 24:8a:07:11:50:a8 brd ff:ff:ff:ff:ff:ff 3: ens5f1: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000 link/ether 24:8a:07:11:50:a9 brd ff:ff:ff:ff:ff:ff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1727301 Title: 229-4ubuntu20 added ARP option breaks existing bonding interfaces To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727301/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs