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What are vlan0 and eth0?

Discussion in 'Tomato Firmware' started by kzrssk, Apr 24, 2008.

  1. kzrssk

    kzrssk LI Guru Member

    I'm running Tomato 1.17 on a WHR-HP-G54. When I look at the bandwidth graphs for both of these interfaces for the last 24 hours, I see traffic going over them. Nothing, however, corresponds to these interfaces in the Device List. What are these interfaces?

  2. leesiulung

    leesiulung LI Guru Member

    I believe the vlan is your wireless network and eth is your wired network. Those numbers are most likely cumulative for all traffic on that type of network.
  3. humba

    humba Network Guru Member

    eth0 is the physical wired ethernet interface... the 4 switch ports as well as the wan port are attached to it.

    vlan0 is the internal vlan that ties the 4 switch ports and the internal port 5 together (port 5 and the wan port are also in vlan1).

    This image from the OpenWRT wiki might help put things into perspective. Bottom line: due to the limited amount of physical interfaces (there are just two.. eth0 and eth1 (wlan)), the wrt routers (it's not limited to tomato but any derivate from the official firmware.. and including the official firmware) use vlans to separate traffic on the wired ethernet interface.
  4. kzrssk

    kzrssk LI Guru Member

    According to the router (from the Device List and Bandwidth Monitor pages), the switchports are br0, the wireless is eth1, and the Internet (WAN) is vlan1. That's why I can't figure out what vlan0 and eth0 are. Everything else is already assigned to another interface!

    Any thoughts?
  5. nvtweak

    nvtweak LI Guru Member

    No. The switch ports are not br0. br0 is the interface that bridges wireless and wired together. Look at the diagram.

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