Linux/Net Config

IP

$ ip addr                                                   # Show all ip addr associated on all interfaces
$ ip -{4|6} addr                                            # Only show IPv4 or IPv6
$ ip addr show eth0                                         # Only show eth0
$ ip link ls up                                             # Only show running interfaces

$ ip addr add {ip_addr/mask} dev {interface}                # Add addr to interface
$ ip addr add broadcast {ADDDRESS-HERE} dev {interface}

$ ip addr del {ipv6_addr_OR_ipv4_addr} dev {interface}

$ ip link set dev {DEVICE} {up|down}                        # Set interface up or down

$ ip neigh show                                             # Show arp cache

# Add a new ARP entry
$ ip neigh add {IP-HERE} lladdr {MAC/LLADDRESS} dev {DEVICE} nud {STATE}

$ ip neigh del {IPAddress} dev {DEVICE}                     # Delete ARP entry

$ ip route list
$ ip route add {NETWORK/MASK} via {GATEWAYIP}
$ ip route add {NETWORK/MASK} dev {DEVICE}
$ ip route add default {NETWORK/MASK} dev {DEVICE}
$ ip route add default {NETWORK/MASK} via {GATEWAYIP}

$ ip route del default
$ ip route del 192.168.1.0/24 dev eth0

Notes:

• ARP Status Fields:

  • STALE - The neighbour is valid, but is probably already unreachable, so the kernel will try to check it at the first transmission.

  • DELAY – A packet has been sent to the stale neighbour and the kernel is waiting for confirmation.

  • REACHABLE – The neighbour is valid and apparently reachable.

References:

1. Linux IP Command Examples