Note - When the appliance is behind a modem that works as a NAT device, the MTU value of the connection must be the same as configured in the modem. If the modem has a PPPoE connection, configure the MTU in the connection to 1492 or lower.
Configure the Maximum Transmission Unit (MTU) size for an interface
You can apply an MTU on:
LANs and DMZ – They must be separate networks, or assigned to a bridge network.
Switches - The MTU is assigned to the switch itself, not the LANs that are assigned to it.
Bonds
VLANs - The VLAN MTU must be lower or equal to its parent MTU.
You cannot apply an MTU on:
Interfaces assigned to switches or bonds.
Bridges - Configure the MTU separately for each of their children.
Aliases
Virtual Access Points
To avoid fragmentation (which slows transmission), set the MTU according to the smallest MTU of all the network devices between your gateway and the packet destination
For static and DHCP mode, set MTU to 1500 or lower.
For PPPoE connections, set MTU to 1492 or lower.
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Note - When the appliance is behind a modem that works as a NAT device, the MTU value of the connection must be the same as configured in the modem. If the modem has a PPPoE connection, configure the MTU in the connection to 1492 or lower. |
For more information, see Configuring Internet Connectivity.