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+To change the MTU of an interface on GNU/Linux, you just need to use ifconfig command to do so, like this for example
+    sudo ifconfig eth0 mtu 1492
+To change it permanently on Debian, put it in the /etc/network/interfaces file, where almost all network parameters are found. To do this, just add a line mtu to the definition of your interface and save the file.
+    sudo gedit /etc/network/interfaces
+Example
+<file>
+iface eth0 inet static
+address 192.168.0.1
+network 192.168.0.0
+gateway 192.168.0.254
+netmask 255.255.255.0
+mtu 1492
+</file>
+Daiup Users
+For dialup users: the Maximum Transmission Unit (MTU) value can be changed within the file
+/etc/ppp/options
+----
+Source: http://www.ubuntugeek.com/how-to-change-mtu-maximum-transmission-unit-of-network-interface-in-ubuntu-linux.html