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https://docs.sophos.com/nsg/sophos-firewall/21.0/Help/en-us/webhelp/onlinehelp/index.html?contextId=CLI-system-lanbypass

lanbypass

When you turn on LAN bypass or Fail to wire (FTW), the firewall bridges one or both bypass port pairs, allowing uninterrupted traffic flow without scanning when there's a power failure or hardware malfunction. The firewall automatically resumes normal functionality when power is restored. See Sophos Firewall: Configure LAN Bypass.

Command

set lanbypass

Syntax

set lanbypass
[on]
[off]

Options

on

Turns lanbypass on.

off

Turns lanbypass off. This is the default setting.