How to Disable a Proxy ARP


Proxy ARP (Address Resolution Protocol) is a method of allowing misconfigured devices on a network to connect to a central routing computer regardless of their status. This can lead to unfortunate consequences down the road when the misconfigured devices break down or the network traffic from the devices is routed through another router that doesn't use Proxy ARP. The most common way to disable Proxy ARP is through a text editor on your Linux computer.

  • Open a Terminal window on your Linux machine (through the desktop or system menu shortcut).

  • Type "nano /etc/sysctl.conf" (without the quotation marks) and press "Enter."

  • Use your "Up" and "Down" arrow keys to find the "net/ipv4/conf/all/proxy_arp = 1" line and change the "1" value to a "0."

  • Press "Ctrl" and "X" to save the file, then reboot your machine.

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