Setting MTU to 9000 changes my IP

thebulgarian

Cadet
Joined
Sep 6, 2012
Messages
5
I have a little problem

My server is
FreeNAS 11.2 Latest update
HP DL360E 2 x E5-2450L 64GB ECC
LSI IT mode HBA 4i4e
HP NC523SFP NIC.



With default MTU of 1500 my IP 10.0.0.92 is up and running with no problem and i have connection to and from my FreeNas.
When I set MTU from web GUI to 9000 my NIC IP address changes from http://10.0.0.92/ to http://0.0.35.40/ and logically I'm losing connection.
I tried DHCP enabled and static IP the result after setting MTU from web GUI to 9000 is http://0.0.35.40/

10.0.9.0/24 is my management network 10.0.0.0/24 i my lab network. They are on 2 different NIC's. Even with deleted 10.0.9.199 interface result is the same.

0.0.35.40.png


Before i set MTU to 9000 thats the output of ifconfig

Code:
ifconfig -m ql0

ql0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=8013b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,TSO4,LINKSTATE>
        capabilities=8013b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,TSO4,LINKSTATE>
        ether 28:80:23:e9:4d:38
        hwaddr 28:80:23:e9:4d:38
        inet 10.0.0.92 netmask 0xffffff00 broadcast 10.0.0.255
        nd6 options=9<PERFORMNUD,IFDISABLED>
        media: Ethernet autoselect (10Gbase-SR <full-duplex>)
        status: active
        supported media:
                media autoselect
                media 10Gbase-SR mediaopt full-duplex



after setting MTU to 9000 from GUI



9000.png


thats the output

9000-1500.png







Tell me if you need any additional information.

Edited my post to less wrong
 
Last edited:

zambanini

Patron
Joined
Sep 11, 2013
Messages
479
there is so much wrong wirh your posting, that answering it is not usefull. first: learn the basics about ipv4, then you should read the freenas manual.
 

thebulgarian

Cadet
Joined
Sep 6, 2012
Messages
5
there is so much wrong wirh your posting, that answering it is not usefull. first: learn the basics about ipv4, then you should read the freenas manual.
That was helpful, thanks!
 

melloa

Wizard
Joined
May 22, 2016
Messages
1,749
1st of all your syntax is incorrect. It should read mtu 9000, not only 9000. That is probably messing up with everything else.
2nd ... I don't use jumbo frames here and, when did, had to change in all, my workstation included, so all services would work. For instance I was not able to run rsync with some configs. Decided to turn auto tune and let it deal with it. I'm getting 10G speeds everywhere.
 

thebulgarian

Cadet
Joined
Sep 6, 2012
Messages
5
1st of all your syntax is incorrect. It should read mtu 9000, not only 9000. That is probably messing up with everything else.
2nd ... I don't use jumbo frames here and, when did, had to change in all, my workstation included, so all services would work. For instance I was not able to run rsync with some configs. Decided to turn auto tune and let it deal with it. I'm getting 10G speeds everywhere.

Thanks! That was the problem, i don't know why i got confused that i have to type 9000 instead of MTU 9000. I guess it is habit from my previous NAS platform.
That is just a lab environment and im running tests with my 10G switch and trying to get some data and choose my configuration for my main FreeNAS.
 

melloa

Wizard
Joined
May 22, 2016
Messages
1,749
That is just a lab environment and im running tests with my 10G switch and trying to get some data and choose my configuration for my main FreeNAS.

One thing the devs did good, was to have the installer recognizing the 10G interface. When I install on my test server, I ended up with 5 interfaces with DHCP, so removed them all and re-added the 10G, set auto tune, and let it control.

Code:
mello@olinda:~$ iperf -c nas
------------------------------------------------------------
Client connecting to nas, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local 10.10.10.60 port 45726 connected with 10.10.10.220 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  10.9 GBytes  9.39 Gbits/sec


You will find out that not all interfaces will work/perform the same on different OSs. For FreeBAS the best I've found was Chelsio; for ESXi Mellanox.

Always read the compatibility list before spending money. I bough lots and re-sold lots on eBay until got where I wanted to be.

Good luck!
 

thebulgarian

Cadet
Joined
Sep 6, 2012
Messages
5
Thanks for the suggestions.
That HP was laying around and i decide to give FreeNAS another try after couple years away :)
So far i have LSI SAS 9207-4i4e and thats it :)
I'll start buying FreeNAS community approved hardware and i'll start learning again.
Thanks again for your time and for your help.
Faith in FreeNAS community restored!!!! :)
 

Chris Moore

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May 2, 2015
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thebulgarian

Cadet
Joined
Sep 6, 2012
Messages
5
Thank you for your advice @Chris Moore I will change the server with Supermicro and better CPU as soon as possible.
 
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