If you want to increase the MTU size for a specific interface (enable
support for jumbo frames), you need to implement the changes described
bellow, but first you should check the supported models and
prerequisites on Cisco ASA Configuration Guide. Note that a reboot is
required
Jumbo
frames should be enabled to receive packets more than 1500 MTU (this
command will take effect after the running-config is saved and the
system has been rebooted):
jumbo-frame reservation
TCP MSS needs to be adjusted to pass large TCP segments:
sysopt connection tcpmss bytes
Set MTU size:
mtu interface_name bytes
