Jumbo Frames / configurable MTU ?

[Spesh]

Hi,

Running TOS 4.1.24 and cannot see an option to change the MTU under the network interface. The network status shows the connection for Lan1 as "1000Mb/s - , 1500" but no option that I can see to change from 1500. This is on my F2-210 but have a F5-422 arriving shortly and was hoping to VLAN the 10gbe NIC for jumbo frames. Have I missed something ?

Many thanks.

[TMSupport]

The option to adjust the value in the WEB GUI is no longer available in the new models.
However, users still can adjust the value by running the command ifconfig eth0 mtu 1500 up
The “1500” is the default value, and you may change to the one you need.

So login as root to the back end of the NAS, the password of the root account is the same as the one of your admin account.

You may install a client like putty (https://putty.org).

[Spesh]

Brilliant! Thank you.

[perezil]

Using the F4-210 (with additional RAM), I am not able to transmit above 1518 (1490 usable)

   [root@UB107COS6 ~]# ifconfig eth0 |grep -i mtu
    UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1

   [root@TNAS-CD4DB6 ~]# ifconfig eth0 |grep -i MTU
   eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 9000

   [root@TNAS-CD4DB6 ~]# ping -M do -s 1491 10.35.0.107
   PING 10.35.0.107 (10.35.0.107) 1491(1519) bytes of data.
      --- 10.35.0.107 ping statistics ---
   75 packets transmitted, 0 received, 100% packet loss, time 75774ms

   [root@TNAS-CD4DB6 ~]# ping -M do -s 1490 10.35.0.107
   PING 10.35.0.107 (10.35.0.107) 1490(1518) bytes of data.
   1498 bytes from 10.35.0.107: icmp_seq=1 ttl=64 time=0.698 ms
   1498 bytes from 10.35.0.107: icmp_seq=2 ttl=64 time=0.624 ms

Is this hardware using an older driver??

[perezil]

Using the TOS 4.2.08 I was able to set the Jumbo Frames to 9000, but since then I am not able to access the web interface.

I have tried issuing the ocmmand ifconfig eth0 mtu 1500 up, but ifconfig shows MTU is 9000.

I have also not found where the configuration file for eth0 is located (I expected /etc/sysconfig/network-scripts/ifcfg-eth0), thus I cannot manually correct the issue.

Can you please provide some guidance:?:

UPDATE: Found the file is: /etc/network. You need to edit the file using VI, and find the section for eth0, then change it to 1500, save the file, and reboot the TNAS.

It looks like if you enabled Jumbo Frames to 9000, you no longer can access the HTML Web Interface.

[TMRyan]

Hi,
Are you operating remotely? It may be that the network connection is unstable when switching to 9000.
After the setting is completed, you wait for a while or restart, but the setting is still not successful?
Is your network a Gigabit network or a 10 Gigabit network? How much does the network settings show?

You need to set the manual to obtain IP first, and then set mtu to 9000.
If it shows that it cannot connect, please try to clear the browser and log in again.