Changing the Speed and Duplex on your Vyatta Router

I was working on my production Vyatta routing infrastructure today and thought this would be some helpful and useful information for someone out there.  Many people set their NIC’s to auto-negotiate which is fine for quick and easy setups, but I’ve found this can be a culprit of many network latency issues in datacenter environments.  So I’m going to walk you through the steps of configuring your WAN NIC for 100MB Full Duplex and your internal or your LAN NIC for 1000MB Full Duplex

First thing you are going to do, is log into your Vyatta Router as the vyatta user

Enter the Configuration mode

configure

Save you current working configuration

save

Configure your WAN Port for 100MB Full Duplex (eth0)

set interfaces ethernet eth0 speed 100

set interfaces ethernet eth0 duplex full

Configure your LAN Ports for 1000MB Full Duplex (eth1)

set interfaces ethernet eth1 speed 1000

set interfaces ethernet eth1 duplex 1000

Save and Commit your changes

commit

save