ip route is the new Linux ip and routing management suite.

ip l # list devices
ip l l eth0 # list only one
ip l s eth0 [down|up] # set link status
ip l s eth0 multicast [on|off] # set multicast status

ip a l # list addresses
ip -4 -o a # list just ipv4 addresses
ip a a 192.168.0.1/24 dev eth0 # set an ip
ip a d 192.168.0.1/32 dev eth0 # remove an ip
ip a f dev eth0 # remove all ips from eth0

ip r # list routes
ip r l m 172.23.0.4 # show the route for the given ip

ip ne # list arp table (ipv4 neighbour table)

# create a tunnel between two host
host1: ip tun add tunnel0 mode ipip remote 192.168.0.2
host1: ip a a 10.0.0.1/24 dev tunnel0
host1: ip l s tunnel0 up
host2: ip tun add tunnel0 mode ipip remote 192.168.0.1
host1: ip a a 10.0.0.2/24 dev tunnel0
host2: ip l s tunnel0 up