What about implementing the unused arp_announce flag on the inetdevice? Something like the following. Totally untested... Looks like it either was there (and got removed) or was planned but never implemented. diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c index e10794d..cefc339 100644 --- a/net/ipv4/devinet.c +++ b/net/ipv4/devinet.c @@ -1089,6 +1089,16 @@ static int inetdev_event(struct notifier } } ip_mc_up(in_dev); + /* fallthru */ + + case NETDEV_CHANGEADDR: + /* Send gratuitous ARP in case of address change or new device */ + if (IN_DEV_ARP_ANNOUNCE(in_dev)) + arp_send(ARPOP_REQUEST, ETH_P_ARP, + in_dev->ifa_list->ifa_address, dev, + in_dev->ifa_list->ifa_address, NULL, + dev->dev_addr, NULL); + break; case NETDEV_DOWN: ip_mc_down(in_dev);
