Port based VLAN
nathan at vidican.com
Wed Dec 22 15:17:04 UTC 2010
On Wed, Dec 22, 2010 at 9:17 AM, Matthew Seaman <
m.seaman at infracaninophile.co.uk> wrote:
> On 22/12/2010 11:15, Indexer wrote:
> > Hi,
> > I plan to make a FreeBSD based router sometime soon. I would like to be
> able to do port based vlanning on the router, so that a client computer that
> plugs into that socket is "dumb" to the vlans' existance.
> > IE
> > em0 - untagged
> > em1 - vlan 1
> > em2 - vlan 2
> > Is what i want to achieve (as a simple example). This way i can use
> unmanaged switches on em2, and all clients behind that are to the router on
> > How does one go about this on freebsd.
> In /etc/rc.conf:
> ifconfig_em1="up -vlanhwtag" # You may or may not want hwtag -- try both
> ifconfig_em2='up -vlanhwtag"
> create_args_vlan1="vlan 1"
> create_args_vlan2="vlan 2"
> The em0 i/f should be configured as usual. This will create virtual
> interfaces vlan1 and vlan2 which you can apply firewall rules to etc.
> Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
> Flat 3
> PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
> JID: matthew at infracaninophile.co.uk Kent, CT11 9PW
I do this exact thing, where a single server port attaches to the switch as
a trunk and carries multiple VLANS which are in-turn firewalled and routed
amongst one another, my rc.conf (the pertinent parts anyways) looks like
cloned_interfaces="vlan1 vlan190 vlan100 vlan200 vlan300 vlan400"
ifconfig_vlan190="inet X.X.190.1/28 vlan 190 vlandev em0"
ifconfig_vlan100="inet 10.0.1.1/26 vlan 100 vlandev em0"
ifconfig_vlan200="inet 10.0.2.254/24 vlan 200 vlandev em0"
ifconfig_vlan300="inet 10.0.3.254/24 vlan 300 vlandev em0"
ifconfig_vlan400="inet 10.0.4.1/28 vlan 4 vlandev em0"
Within my rc.firewall, the interfaces are vlan1, vlan190, vlan100, etc...
the system sees each as if it were physically a different network card and
I'm able to route/filter traffic as such. Note: I did have to add vlan
support in my kernel for this, I'm using Intel 1000MT 1000BaseSX (fiber)
card to a Cisco Catalyst 2948 which in turn connects on the other side as a
nathan at vidican.com
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