When changing the interface hardware address, it also works: ip link set eth0 addr XX:XX:XX:XX:XX:XX.
It also works when using virtio_net. It has been tested with e1000e, where it fails when setting the interface up. When changing the address, __dev_xmit_skb will call sch_direct_xmit and the packet will reach the network. When setting the interface up, __dev_xmit_skb will call dev_qdisc_enqueue and the packet will not reach the network. Interface tx_packets stats will also not change. This indicates a possible issue with the qdisc code when the interface has just been setup. Notice that the code is called from the NETDEV_UP notifier. Cascardo. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1989187 Title: 5.4: Setting net.ipv4.conf.<interface>.arp_notify=1 does not generate gratuitous ARPs Status in linux package in Ubuntu: New Bug description: Expected behaviour: The kernel should send out a gratuitous ARP on the interface when the following commands are executed: $ sudo sysctl -w net.ipv4.conf.eth0.arp_notify=1 net.ipv4.conf.eth0.arp_notify = 1 $ sudo ip link set dev eth0 down $ sudo ip link set dev eth0 up Result: The gratuitous ARP packet is generated inside the kernel (inetdev_send_gratuitous_arp() is called) but the packet is never sent out on the interface. Generating gratuitous ARP packets with "arping" works however. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1989187/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
