On Wed, 23 Sep 2020 at 04:33, Carlos Lopez <clopmz at outlook.com> wrote: > Hi all, > > > With SystemD, how can I make certain service dependent on certain network > interfaces being up? > > For example, I have an 802.1ad bond interface I need to wait on for being > up (this interface has no ip address assigned, it is used to capture > networks packets with a tcpdump’s script). Every time this service fails > because bond interface is not up. > > > > I have configured the service as: > > > [Unit] > > Description=tcpdump capture script > > After=network.target > > Wants=network-online.target > > > > But it doesn’t work …. Any tip or trick? > > > So the network just calls the scripts and exits so they can take a while to get working. I think this website covers what you want to do https://unix.stackexchange.com/questions/257888/systemd-wait-for-network-interface-to-be-up-before-running-service systemctl list-units --no-pager | grep subsystem-net Then look for the device which matches the one you are listening to. Change the After=network.target to BindsTo=sys-devices-virtual-net-<device>.device After=sys-devices-virtual-net-<device>.device where <device> is the interface you found (aka eth2, br9, bond0 etc) > My host is CentOS8 x86_64. > > > Regards, > C. L. Martinez > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > -- Stephen J Smoogen.