Technical Tip: Finding the MTU of the FortiGate interface

[nithincs]

Description
This article provides command to find the MTU of the interface.

Solution
To find mtu of fortigate interface, please use below command.

# diag netlink interface list <NIC name>

Example:

aegon-kvm20 # diag netlink interface list port2

if=port2 family=00 type=1 index=4 mtu=1500 link=0 master=0
ref=24 state=off start fw_flags=10000000 flags=up broadcast run multicast
Qdisc=pfifo_fast hw_addr=00:61:65:67:14:02 broadcast_addr=ff:ff:ff:ff:ff:ff
stat: rxp=9968975 txp=8088060 rxb=772450224 txb=601099402 rxe=0 txe=0 rxd=0 txd=0 mc=0 collision=0
re: rxl=0 rxo=0 rxc=0 rxf=0 rxfi=0 rxm=0
te: txa=0 txc=0 txfi=0 txh=0 txw=0
misc rxc=0 txc=0
input_type=0 state=3 arp_entry=0 refcnt=24