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The XG Series hardware appliances will reach end-of-life (EOL) on March 31, 2025. Click here to see the XG to XGS migration documentation.

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https://docs.sophos.com/nsg/sophos-firewall/20.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=CLI-set-arp-flux

arp-flux

ARP flux occurs when multiple ethernet adapters, often on a single device, respond to an ARP query. Due to this, a problem with the link-layer address to IP address mapping can occur. Sophos Firewall may respond to ARP requests from both Ethernet interfaces. On the device creating the ARP request, these multiple answers can cause confusion. ARP flux only takes effect when Sophos Firewall has multiple physical connections to the same medium or broadcast domain.

Command

set arp-flux

Syntax

set arp-flux [on|off]

Options

on

Sophos Firewall may respond to ARP requests from both ethernet interfaces when Sophos Firewall has multiple physical connections to the same medium or broadcast domain.

off

Sophos Firewall responds to ARP requests from respective ethernet interfaces when Sophos Firewall has multiple physical connections to the same medium or broadcast domain.