MTU to 9000

[massmux]

I have FreeNAS serving iSCSI to xenserver. I set xenserver network to MTU 9000.
I am not sure how to setup FreeNAS side. On FreeNAS side, all the net configuration is taken up by a DHCP, so inside -> network -> interface I have no entry.
Any suggestion on how to do?

 

[m0nkey_]

How to configure the MTU is covered in the documentation: http://doc.freenas.org/11/network.html#interfaces

 

[massmux]

thank you monkey.
i quite know the document you linked.
i am in the situation of the note
"""
Typically, the interface used to access the FreeNAS® administrative GUI is configured by DHCP. This interface does not appear in this screen, even though it is already dynamically configured and in use.
"""
in my case the interface is the same nic than the storage.
this is why i ask. Since i am in that situation and dhcp already configurated the nic, now can i set mtu for jumbo ?

 

[massmux]

can you help me to understand if the following interface has jumbo (mtu 9000) enabled? option seems ok


igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=6403bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
ether x
hwaddr x
inet xxx netmask 0xffffffc0 broadcast xxx
nd6 options=9<PERFORMNUD,IFDISABLED>
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
inet6 ::1 prefixlen 128
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
inet 127.0.0.1 netmask 0xff00ff0
nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>

 

[m0nkey_]

igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500

No, you're using the standard 1500. You will have to configure an interface in the Interface screen. There is a checkbox to use DHCP if you need to use it.