Iproute2 is the new way to controll and monitor networking in the Linux kernel.
root@host:~# ip addr add 192.168.2.41/24 dev eth0
root@host:~# ip addr add 192.168.2.42/24 dev eth0
root@host:~# ip route del default
root@host:~# ip route add default via 192.168.2.1
root@host:~# ip route add 192.168.1.210 dev ppp0
root@host:~# ip link set ens33 up
root@host:~# ip link set ens33 down
root@host:~# ip link add link eth0 name IPv6 type vlan id 10
root@host:~# ip link set IPv6 up
root@host:~# ip link set IPv6 down
root@host:~# ip link delete IPv6
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