FreeBSD Configure NIC Jumbo Frames

To configure Jumbo Frames on a network interface card (NIC) on a FreeBSD system, you will need to do the following:

1. Determine the maximum MTU size supported by the NIC and the network infrastructure. The MTU size is the maximum size of a single packet that can be transmitted over the network. Jumbo Frames are typically defined as packets with an MTU size of 9000 bytes or larger.

2. Edit the /etc/rc.conf file and add the following line to set the MTU size for the NIC:

ifconfig_<interface>_mtu="<MTU size>"

Replace <interface> with the network interface name, such as em0, and replace <MTU size> with the desired MTU size, such as 9000.

For example, to set the MTU size to 9000 for the em0 interface, you can add the following line to the /etc/rc.conf file:

ifconfig_em0_mtu="9000"

3. Restart the network interface by running the following command:

# service netif restart <interface>

Replace <interface> with the network interface name, such as em0.

This will configure Jumbo Frames on the specified network interface.

Note that configuring Jumbo Frames on a NIC does not automatically enable Jumbo Frames on the network infrastructure. You will also need to ensure that the switches and other network devices on the network support Jumbo Frames and are configured to use them.

For more information about configuring Jumbo Frames on a FreeBSD system, you can refer to the FreeBSD documentation and the ifconfig man page by running man ifconfig on the command line.