Arp (command)

arp command displays or modify IP to MAC translation table used by the Address Resolution Protocol (ARP)

Linux commands

• View ARP Cache:
  • arp -a
  • arp -an (Linux, MacOS)
  • cat /proc/net/arp
• Delete an ARP entry:
  • arp -d 192.168.0.1
• Set ARP entry:
  • arp -s address hw_addr

Windows commands

• Clear ARP Cache:
  • arp -d

Cisco IOS

• show arp
• show mac-address-table

Related terms

• ip -s neighbor list
• ip link set arp off dev eth0; ip link set arp on dev eth0
• /proc/sys/net/ipv4/route/gc_timeout

See also

• Address Resolution Protocol (ARP): arp (command), arping, arp spoofing, MAC, CAM, show ip arp, ARP table, Proxy ARP, Address
• Ethernet: MII, MDI, bonding, etherchannel, STP, ARP, MAC, STP, Jumbo frames, 802.1X, MTU, Ethernet In-Band Access (IBA), LACP, Multicast, Broadcast, SPI
• Networking: bandwidth, latency, Jitter, Ethernet, UPnP, MPLS, Frame Relay, ATM, TCP/IP, ARP, WiFi, BGP, Networking timeline, Router, Proxy ARP, Services & Networking, Traffic shapper

http://man7.org/linux/man-pages/man8/arp.8.html