ip COMMANDCHEAT SHEET

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IP QUERIES

addrDisplay IP Addresses and property information
(abbreviation of address)
ip addr
Show information for all addresses
ip addr show dev em1
Display information only for device em1
linkManage 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
routeDisplay and alter the routing table
ip route
List all of the route entries in the kernel
maddrManage and display multicast IP addresses
ip maddr
Display multicast information for all devices
ip maddr show dev em1
Display multicast information for device em1
neighShow 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
helpDisplay 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

MULTICAST ADDRESSING

maddr addAdd 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

MODIFYING ADDRESS AND LINK PROPERTIES

addr addAdd 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 delDelete an address
ip addr del 192.168.1.1/24 dev em1
Remove address 192.168.1.1/24 from device em1
link setAlter 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

ADJUSTING AND VIEWING ROUTES

route addAdd 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 gateway
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 deleteDelete 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 gateway at
192.168.1.1
route replaceReplace, 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 getDisplay the route an address will take
ip route get 192.168.1.5
Display the route taken for IP 192.168.1.5

MANAGING THE ARP TABLE

neigh addAdd 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 delInvalidate an entry
ip neigh del 192.168.1.1 dev em1
Invalidate the entry for 192.168.1.1 on em1
neigh replaceReplace, 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 em1

USEFUL NETWORKING COMMANDS (NOT NECESSARILY PROVIDED FROM IPROUTE)

arpingSend 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
ethtoolQuery 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
ssDisplay 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

COMPARING NET-TOOLS VS. IPROUTE PACKAGE COMMANDS

arp -a ip neigh
arp -vip -s neigh
arp -s 192.168.1.1 1:2:3:4:5:6arp -s 192.168.1.1 1:2:3:4:5:6
arp -i eth1 -d 192.168.1.1ip neigh del 192.168.1.1 dev eth1
ifconfig -aip addr
ifconfig eth0 downip link set eth0 down
ifconfig eth0 upip link set eth0 up
ifconfig eth0 192.168.1.1ip addr add 192.168.1.1/24 dev eth0
ifconfig eth0 netmask 255.255.255.0ip addr add 192.168.1.1/24 dev eth0
ifconfig eth0 mtu 9000ip link set eth0 mtu 9000
ifconfig eth0:0 192.168.1.2ip addr add 192.168.1.2/24 dev eth0
netstatss
netstat -neopass -neopa
netstat -gip maddr
routeip route
route add -net 192.168.1.0 netmask 255.255.255.0 dev eth0ip route add 192.168.1.0/24 dev eth0
route add default gw 192.168.1.1ip route add default via 192.168.1.1

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