Linux Networking

Install net-tools if not installed on Ubuntu

rwelsh@Ubuntu01:~$ sudo apt install net-tools

Reading package lists… Done
Building dependency tree… Done
Reading state information… Done

The following NEW packages will be installed:


ens160: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet  netmask  broadcast
        inet6 2a00:6020:a396:800:698c:7d8e:fbea:3277  prefixlen 64  scopeid 0x0<global>
        inet6 fe80::f3c3:1629:6f71:dae4  prefixlen 64  scopeid 0x20<link>
        inet6 2a00:6020:a396:800:920:46a6:6a25:bc7b  prefixlen 64  scopeid 0x0<global>
        ether 00:0c:29:f5:27:30  txqueuelen 1000  (Ethernet)
        RX packets 25756  bytes 37902133 (37.9 MB)
        RX errors 0  dropped 432  overruns 0  frame 0
        TX packets 8735  bytes 742702 (742.7 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet  netmask
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 154  bytes 14295 (14.2 KB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 154  bytes 14295 (14.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Networking Commands

sudo apt install net-tools This will install typical tools to control / configure the network subsystem, for example:

arp – Man Page

manipulate the system ARP cache

Examples (TL;DR)

  • Show the current ARP table: arp -a
  • Delete a specific entry: arp -d address
  • Create an entry in the ARP table: arp -s address mac_address


arp [-vn] [-H type] [-i if] [-ae] [hostname]

arp [-v] [-i if] -d hostname [pub]

arp [-v] [-H type] [-i if] -s hostname hw_addr [temp]

arp [-v] [-H type] [-i if] -s hostname hw_addr [netmask nm] pub

arp [-v] [-H type] [-i if] -Ds hostname ifname [netmask nm] pub

arp [-vnD] [-H type] [-i if] -f [filename]


This program is obsolete. For replacement check ip neigh.


Arp manipulates or displays the kernel’s IPv4 network neighbour cache. It can add entries to the table, delete one or display the current content.

ARP stands for Address Resolution Protocol, which is used to find the media access control address of a network neighbour for a given IPv4 Address.


arp with no mode specifier will print the current content of the table. It is possible to limit the number of entries printed, by specifying an hardware address type, interface name or host address.

arp -d address will delete a ARP table entry. Root or netadmin privilege is required to do this. The entry is found by IP address. If a hostname is given, it will be resolved before looking up the entry in the ARP table.

arp -s address hw_addr is used to set up a new table entry. The format of the hw_addr parameter is dependent on the hardware class, but for most classes one can assume that the usual presentation can be used.  For the Ethernet class, this is 6 bytes in hexadecimal, separated by colons. When adding proxy arp entries (that is those with the publish flag set) a netmask may be specified to proxy arp for entire subnets. This is not good practice, but is supported by older kernels because it can be useful. If the temp flag is not supplied entries will be permanent stored into the ARP cache. To simplify setting up entries for one of your own network interfaces, you can use the arp -Ds address ifname form. In that case the hardware address is taken from the interface with the specified name.


-v,  –verbose

Tell the user what is going on by being verbose.

-n,  –numeric

shows numerical addresses instead of trying to determine symbolic host, port or user names.

-H type, –hw-type type, -t type

When setting or reading the ARP cache, this optional parameter tells arp which class of entries it should check for.  The default value of this parameter is ether (i.e. hardware code 0x01 for IEEE 802.3 10Mbps Ethernet). Other values might include network technologies such as ARCnet (arcnet) , PROnet (pronet) , AX.25 (ax25) and NET/ROM (netrom).


Use alternate BSD style output format (with no fixed columns).


Use default Linux style output format (with fixed columns).

-D,  –use-device

Instead of a hw_addr, the given argument is the name of an interface. arp will use the MAC address of that interface for the table entry. This is usually the best option to set up a proxy ARP entry to yourself.

-i If, –device If

Select an interface. When dumping the ARP cache only entries matching the specified interface will be printed. When setting a permanent or temp ARP entry this interface will be associated with the entry; if this option is not used, the kernel will guess based on the routing table. For pub entries the specified interface is the interface on which ARP requests will be answered.
Note: This has to be different from the interface to which the IP datagrams will be routed. Note: As of kernel 2.2.0 it is no longer possible to set an ARP entry for an entire subnet. Linux instead does automagic proxy arp when a route exists and it is forwarding. See arp(7) for details. Also the dontpub option which is available for delete and set operations cannot be used with 2.4 and newer kernels.

-f filename, –file filename

Similar to the -s option, only this time the address info is taken from file filename. This can be used if ARP entries for a lot of hosts have to be set up.  The name of the data file is very often /etc/ethers, but this is not official. If no filename is specified /etc/ethers is used as default.

The format of the file is simple; it only contains ASCII text lines with a hostname, and a hardware address separated by whitespace. Additionally the pub, temp and netmask flags can be used.

In all places where a hostname is expected, one can also enter an IP address in dotted-decimal notation.

As a special case for compatibility the order of the hostname and the hardware address can be exchanged.

Each complete entry in the ARP cache will be marked with the C flag. Permanent entries are marked with M and published entries have the P flag.


/usr/sbin/arp -i eth0 -Ds eth1 pub

This will answer ARP requests for on eth0 with the MAC address for eth1.

/usr/sbin/arp -i eth1 -d

Delete the ARP table entry for on interface eth1. This will match published proxy ARP entries and permanent entries.



arp manipulate the system ARP cache

ether-wake A tool to send a Wake-On-LAN “Magic Packet”
ifconfig configure a network interface
ipmaddr adds, deletes, and displays multicast addresses
iptunnel creates, deletes, and displays configured tunnels
mii-diag Network adapter control and monitoring
mii-tool view, manipulate media-independent interface status
nameif name network interfaces based on MAC addresses
netstat Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships
plipconfig fine tune PLIP device parameters
route show / manipulate the IP routing table
slattach attach a network interface to a serial line