That is MTU

The Maximum Transmission Unit (MTU) or maximum transmission unit, is a parameter that determines the size of the largest datragrama that can be transmitted by an IP interface (without having to be party in the smallest unit). The MTU should be bigger than the total size of the largest datagram to be transmitted without being fragmented.

If we want to improve performance or performance of our network to transmit data is possible to increase the value of the MTU. To make the performance tests and increase it temporarily use ifconfig $ IFACE mtu $ number, where $ IFACE is the network interface, as an example: 


  deathbian: ~ # ifconfig eth0 mtu 4000


If we want to use it in our directions we can apply the static mtu inside / etc / network / interfaces. Under the entry for eth0, add a line like this: 

  mtu 1400


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