Performance tuning the network controller (MTU)

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Revision as of 00:31, 26 June 2006

  • Every time you send a 1500 size packet out on a MTU1492 network you end up with two packets: 1492 + 8. That's why the speed drops - The second packet is almost empty! If you type: 
ifconfig eth0
  • It will show: 
MTU = 1500
  • The standard MTU[1] for DSL and cable is 1492 maximum, for DSL via PPPoE[2] it is often 1480 (you best ask your provider for the correct value). You can:
  • Add the following line to one of your startup files in the start section, e.g. in 
/etc/init.d/networking

/sbin/ifconfig eth0 mtu 1492
OR
  • Add "mtu 1492" (a line by itself) to 
/etc/network/interfaces
  1. ↑ :maximum transmission unit
  2. ↑ :Point-to-Point Protocol Over Ethernet
Retrieved from "http://buffalo.nas-central.org/wiki/Performance_tuning_the_network_controller_(MTU)"
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