change mtu help

Les Mikesell lesmikesell at
Sun Feb 3 03:52:45 UTC 2008

Mikkel L. Ellertson wrote:
> chloe K wrote:
>> Hi all
>> how can I change the mtu to 1600?
>> can i do it in rc.local or
>> /etc/sysconfig/network-scripting
> If you want to change it for a specific interface, you can do it in 
> /etc/sysconfig/network-scripts/ifcfg-<interface> using the MTU=1600 
> option. If you want to know more about the different interface files, 
> and the options in them, you may want to read 
> /usr/share/doc/initscripts-<version>/sysconfig.txt.

But setting the MTU higher than permitted on the physical media is not 
likely to work.  For example, ethernet is normally restricted to 1500. 
Also, this setting doesn't include the ethernet header and trailer bytes 
so if you are working with 'baby giant' packets with devices that 
support them you may still need a setting a bit less than 1600.
   Les Mikesell
    lesmikesell at

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