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ROOT ‹ FreeBSD, Linux and AIX ‹ TCP/IP Networking ‹ How to add (persistent) static ARP entries in Linux

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How to add (persistent) static ARP entries in Linux

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mandrei99

Post subject: How to add (persistent) static ARP entries in Linux | Posted: Mon Sep 29, 2014 5:17 am

Joined: Tue Aug 04, 2009 9:16 am
Posts: 250

How to add (persistent) static ARP entries in Linux

A MAC (or physical - depending on context) address is the layer 2 address of the network interface card on an ethernet network. It is used by routers/switches to move frames in the same layer 2 network segment.

ARP is the protocol that maps a physicall address to an IP adddress. This is either dynamic (request & reply) or static. In an unsecured environment, it is best to use static mapping (manual defined) specially with the gateway.

Adding a static ARP entry:

Code:

# arp -s 10.0.0.1 00:8b:8a:4c:25:1f

To make the static arp entries persistent after reboot add following line in /etc/ethers file:

Code:

10.0.0.1 00:8b:8a:4c:25:1f

after which "arp -f" command can be ran to make it take effect immediately.

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