IP Command for Red Hat Enterprise Linux

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4 years ago

In this post, we have listed some important IP commands for Red Hat Enterprise Linux.

addr Display IP Addresses and property information
- - ip addr – Show information for all addresses
  - ip addr show dev em1 – Display information only for device em1
link Manage and display the state of all network interfaces
- - ip link – Show information for all interfaces
  - ip link show dev em1 – Display information only for device em1
  - ip -s link – Display interface statistics
route Display and alter the routing table
- - ip route – List all of the route entries in the kernel
maddr Manage and display multicast IP addresses
- - ip maddr – Display multicast information for all devices
  - ip maddr show dev em1 – Display multicast information for device em1
neigh Show neighbour objects; also known as the ARP table for IPv4
- - ip neigh – Display neighbour objects
  - ip neigh show dev em1 – Show the ARP cache for device em1
help Display a list of commands and arguments for each subcommand
- - ip help – Display ip commands and arguments
  - ip addr help – Display address commands and arguments
  - ip link help – Display link commands and arguments
  - ip neigh help – Display neighbour commands and arguments

maddr add Add a static link-layer multicast address
- - ip maddr add 33:33:00:00:00:01 dev em1 – Add mutlicast address 33:33:00:00:00:01 to em1
maddr del Delete a multicast address
- ip maddr del 33:33:00:00:00:01 dev em1 – Delete address 33:33:00:00:00:01 from em1

addr add Add an address
- - ip addr add 192.168.1.1/24 dev em1 – Add address 192.168.1.1 with netmask 24 to device em1
addr del Delete an address
- - ip addr del 192.168.1.1/24 dev em1 – Remove address 192.168.1.1/24 from device em1
link set Alter the status of the interface
- - ip link set em1 up – Bring em1 online
  - ip link set em1 down – Bring em1 offline
  - ip link set em1 mtu 9000 – Set the MTU on em1 to 9000
  - ip link set em1 promisc on – Enable promiscuous mode for em1

route add Add an entry to the routing table
- - ip route add default via 192.168.1.1 dev em1 – Add a default route (for all addresses) via the local gw 192.168.1.1 that can be reached on device em1
  - ip route add 192.168.1.0/24 via 192.168.1.1 – Add a route to 192.168.1.0/24 via the gateway at 192.168.1.1
  - ip route add 192.168.1.0/24 dev em1 – Add a route to 192.168.1.0/24 that can be reached on device em1
route delete Delete a routing table entry
- - ip route delete 192.168.1.0/24 via 192.168.1.1 – Delete the route for 192.168.1.0/24 via the gw at 192.168.1.1
route replace Replace, or add if not defined, a route
- - ip route replace 192.168.1.0/24 dev em1 – Replace the defined route for 192.168.1.0/24 to use device em1
route get Display the route an address will take
- - ip route get 192.168.1.5 – Display the route taken for IP 192.168.1.5

neigh add Add an entry to the ARP Table
- - ip neigh add 192.168.1.1 lladdr 1:2:3:4:5:6 dev em1 – Add address 192.168.1.1 with MAC 1:2:3:4:5:6 to em1
neigh del Invalidate an entry
- - ip neigh del 192.168.1.1 dev em1 Invalidate the entry for 192.168.1.1 on em1
neigh replace Replace, or adds if not defined, an entry to the ARP table
- - ip neigh replace 192.168.1.1 lladdr 1:2:3:4:5:6 dev em1 – Replace the entry for address 192.168.1.1 to use MAC 1:2:3:4:5:6 on em

arping Send ARP request to a neighbour host
- arping -I eth0 192.168.1.1 – Send ARP request to 192.168.1.1 via interface eth0
  arping -D -I eth0 192.168.1.1 – Check for duplicate MAC addresses at 192.168.1.1 on eth0
ethtool Query or control network driver and hardware settings
- - ethtool -g eth0 Display ring buffer for eth0
  - ethtool -i eth0 Display driver information for eth0
  - ethtool -p eth0 Identify eth0 by sight, typically by causing LEDs to blink on the network port
  - ethtool -S eth0 Display network and driver statistics for eth0
ss Display socket statistics. The below options can be combined
- - ss -a Show all sockets (listening and non-listening)
  - ss -e Show detailed socket information
  - ss -o Show timer information
  - ss -n Do not resolve addresses
  - ss -p Show process using the socket

Reference: CHEAT SHEET for Red Hat Enterprise Linux

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