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Ali Mezgani
Asked: 2011-06-26 11:24:21 +0800 CST

FreeBSD and Linux VLAN

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I have a LAN and i need to create a LAB with three VLAN on my boxes, Linux and FreeBSD.

Well i create a VLAN 1 on the linux box as follow: 


sudo vconfig add eth0 1
sudo ifconfig eth0.1 inet6 add 2001:470:9b36:2::2/64

and i do the same on the FreeBSD box: 


sudo ifconfig vlan1 create
sudo ifconfig vlan1 inet6 2001:470:9b36:2::1 prefixlen 64 vlan 1 vlandev bge0

ifconfig of FreeBSD box 


vlan2: flags=8843 metric 0 mtu 1500
    options=3
    ether 00:11:85:61:90:f2
    inet6 fe80::211:85ff:fe61:90f2%vlan2 prefixlen 64 scopeid 0x5 
    inet6 2001:470:9b36:2::1 prefixlen 64 
    inet 10.0.0.1 netmask 0xffffff00 broadcast 10.0.0.255
    nd6 options=3
    media: Ethernet autoselect (100baseTX )
    status: active
    vlan: 2 parent interface: bge0

and the ifconfig of the Linux Box: 


eth0.2    Link encap:Ethernet  HWaddr d8:d3:85:28:d3:28

          inet addr:10.0.0.2  Bcast:10.0.0.255  Mask:255.255.255.0
          inet6 addr: fe80::dad3:85ff:fe28:d328/64 Scope:Link
          inet6 addr: 2001:470:9b36:2::2/64 Scope:Global
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:962 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:43400 (42.3 KiB)

But i still not able to ping the VLANs from each side ? What would be the states of each of the interfaces bge0 and eth0 ?

NB: the eth0 and bge0 are up and running

linux vlan freebsd local-area-network ipv6

3 Answers

  1. Have you tried something other then VLAN1? VLAN1 is typically considered to be the un-tagged VLAN. Generally you should not be trying to add that as a tagged VLAN.

    I am not sure about FreeBSD, but in Linux, there is a warning when you try to use that.

    How are the two systems physically connected?

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  2. If all you see is the 'who has' requests, there is no ethernet traffic on the chosen vlan. A switch with vlan or jumbo frame support may be needed, although I'm not sure about this (neighbour discovery and icmp6 traffic shouldn't use 1500 byte frames).

    Could you post the output of 'ifconfig -a' on both systems? My guess is something is missing.

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  3. You'll need a Layer 2 switch that will support 802.1Q. Effectively, that would mean a managed switch. On an unmanaged switch, there is no mechanism for the frame to be routed based on the tag.

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