How to create and use a tagged VLAN in Shibby?

Discussion in 'Tomato Firmware' started by jd_hupp, Sep 4, 2014.

  1. jd_hupp

    jd_hupp Network Newbie Member

    For a Linksys E1200 and Shibby 1.28, I don't want to dedicate a port on the router to a VLAN, but use tags to segment the traffic on the default VLAN from a new VLAN.

    Given the brief explanation in the Virtual LAN article on wikipedia, it seems like this should be possible:
    In computer networking, a single layer-2 network may be partitioned to create multiple distinct broadcast domains, which are mutually isolated so that packets can only pass between them via one or more routers; such a domain is referred to as a virtual local area network, virtual LAN or VLAN.

    This is usually achieved on switch or router devices. Simpler devices only support partitioning on a port level (if at all), so sharing VLANs across devices requires running dedicated cabling for each VLAN. More sophisticated devices can mark packets through tagging, so that a single interconnect (trunk) may be used to transport data for multiple VLANs.

    Can I in fact do this? I have seen little-to-no documentation that would help me. There is not only the question of how to configure the new VLAN, but also how to associate specific machines with it.

    (The new VLAN would be Ethernet-only, by the way - no WiFi.)
  2. jd_hupp

    jd_hupp Network Newbie Member

    Answering my own question:

    After further reading on VLAN's in general, it seems that the usual way that a packet gets tagged is to arrive at a from a PC, network printer, etc. to a port on a switch or router that supports tagging, and for which that port is configured to tag the packets as belonging to a certain VLAN. From there the packet can be switched/routed to another switch or router that supports tagging, perhaps via a trunk port that carries a mix of packets tagged for this or that VLAN.

    A related conclusion: tagged packets are used in cases involving at least two switches or routers that support tagging.

    Another conclusion: a port cannot be a trunk port and access port at the some time. An access port connects to a computer, network printer, etc. A trunk port connects to another tag-supporting switch or router.

    It is also reported in one post somewhere that the Linksys E1200 does not support tagging (the 802.1Q standard).
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