Sophos XG Firewall Administrator Guide v15.01.0

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Available Options:If gateway fails - Backup gateway will take over and traffic will be
routed through the backup gateway only when the gateway fails.If gateway fails -
Backup gateway will take over and traffic will be routed through the backup gateway when any of the active
gateways fails.If the gateways fail - Backup gateway will take over and traffic will be routed through
the backup gateway when all the configured active gateways fail.
Action on Activation (Only if the gateway type “Backup” is selected)
Configure the weight for the backup gateway. The device distributes traffic across links in proportion to the
ratio of weights assigned to individual links. This weight determines how much traffic will pass through a
particular link relative to the other link(s).
Inherit weight of the failed active gateway
Backup gateway will inherit the parent gateway’s (active gateway) weight
Use pre-configured weight
Specify the weight.
Figure 161: Gateway Settings - Backup
4. Enter details for Advanced Settings.
MTU
MSS
Specify the MTU value (Maximum Transmission Unit).
MTU is the largest physical packet size, in bytes, that a network can transmit. This parameter becomes an
issue when networks are interconnected and the networks have different MTU sizes. Any packets larger than
the MTU value are divided (fragmented) into smaller packets before being sent.
Default: 1500
Acceptable Range: 576 to 1500
Specify the MSS value.
MSS defines the amount of data that can be transmitted in a single TCP packet.
Default: 1460
Acceptable Range: 536 to 146
MAC Address (Only for Network Adapter (DHCP))
From the available options, select a method to provide a MAC address for the modem:
Available Options:Use Default MAC AddressOverride Default MAC Address.On selection of the option
Override Default MAC Address, provide the MAC address.