Recently I have been doing some reworking on networking at work. One of the new requirements is that everything be network connection be a tagged VLAN. This is a pretty simple process in Red Hat Linux with multiple paths. Test files are my favorite way to make these changes so lets assume that I want the VLAN to be 455 with the nic eth0.

  • Navigate to your networking scripts:  /etc/sysconfig/network-scripts
  • Copy your current eth0 configuration cp ifcfg-eth0 ifcfg-eth0.455
  • Open the file:

  • Modify the device name to read eth0.455
  • Add the line VLAN=yes to the end of the file
  • Save and exit
  • Shutdown the old interface (make sure your on console)
  • ifdown eth0
  • Bring up new VLAN
  • ifup eth0.455
  • Delete old interface rm ifcfg-eth0

That’s all you have to do and your Operating system will be tagging all outbound traffic with VLAN 455 and only reading traffic from 455.

© 2010, Joseph Griffiths. All rights reserved.

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