====== Adjust MTU size ======

Sometimes it is usefull to alter the MTU size of an interface.

===== Overview =====

==== Level of difficulty ===

   Easy

==== Use-case ====

The MTU size on the LAN-Bridge shoule be raised to 9000 to enable 'Jumbo Frames' 

^ proberties of scenario ^^
| interface | lan |
| mtu-size | 9000 |

==== Related topics ====

  * [[documentation:configuration:uci|UCI]]
  * [[documentation:configuration:config_files:config_network|/etc/config/config_network]]
  
===== Instructions =====

==== GUI ====

In this tutorial we will alter the MTU size.
At first you must log in to your router. 

Go to the __Network Settings__ tab and then to __Connectivity__.

{{ :howto:general:network:dd-wrt_nxt_-_chromium_004.png?nolink&800 |}}

After choosing your __Operation Mode__ you can set __MTU__ to **Custom**.
==== UCI Config System ====

  * **Add mtu setting**
<code>
uci set network.lan.mtu=9000
</code>        

  * **Store changes**
<code>
uci commit network
</code>

  * **Apply changes**
<code>
/etc/init.d/network restart
</code>

==== UCI config files (native) ====

[[documentation:configuration:config_files:config_file_network|/etc/config/config_network]]

   * **Add mtu option**
<code>
config 'something'
        option 'name' 'whatever'
        
</code>

===== Troubleshooting =====

Not available, yet