Performance tuning the network controller (MTU)

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	Based on work by tklee, briand, frontalot, and nix.		Based on work by tklee, briand, frontalot, and nix.

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Revision as of 23:09, 20 July 2006

This article Based on work by tklee, briand, frontalot, and nix. Originally by frontalot. at Linkstationwiki.org

• 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