ip

# Create bridge, connect interface
ip l add br0 type bridge
ip l set br0 up
ip l set enp1s0 up
ip l set enp1s0 master br0
# enable bridging of traffic from 'IEEE 802.1D MAC Bridge Filtered MAC Group Addresses'
# this is necessary e.g. for 802.1X EAP
echo 65528 > /sys/class/net/br0/bridge/group_fwd_mask

# Remove interface from bridge, delete bridge
ip l set enp1s0 nomaster
ip l delete br0


# Create VLAN-tagged interface
ip l add link enp1s0 name enp1s0.100 type vlan id 100
ip l set dev enp1s0.100 up
dhcpcd enp1s0.100   # or add IP manually before setting device up

# Remove VLAN-tagged interface
ip l set dev enp1s0.100 down
ip l delete enp1s0.100


# Create and use network namespace
ip netns add mynetns
ip l set dev enp1s0 netns mynetns
ip netns exec mynetns fish