VLAN support in rcNG [PATCH]

Adam C. Migus adam at migus.org
Sat Apr 17 20:21:26 PDT 2004

Quoting Brooks Davis <brooks at one-eyed-alien.net>:

> On Sat, Apr 17, 2004 at 08:20:17PM -0400, Matthew N. Dodd wrote:
> > On Sat, 17 Apr 2004, Brooks Davis wrote:
> > > It works by doing a major overhaul of the device cloning support
> so you
> > > can create interfaces of the form <etherif>.<vlantag> and get an
> vlan
> > > interface with the appropriate parent and tag.
> > 
> > Please make this behavior optional.
> The entire patch has exactly one change which is visiable to the
> userland unless the user changes their behavior.  That change is
> that
> when you do "ifconfig stf create" ifconfig does not output "stf0"
> and
> the interface created is named "sft" instead of "stf0".  This is a
> result of a minor change that allows you to create "6to4" a more
> aptly named interface.  This change is mostly an example of how to
> write
> new style interface cloners that's easier to understand then the
> vlan
> version which was the motivation for this overhaul.
> The vlan change allows vlan interfaces to work exactly like they did
> before.  It just adds some sugar so that the following sets of
> commands
> are equivalent:
> ifconfig xl0.2
> vlanif=`ifconfig vlan create`
> ifconfig $vlanif name xl0.2
> ifconfig xl0.2 vlandev xl0 vlantag 2
> -- Brooks
> -- 
> Any statement of the form "X is the one, true Y" is FALSE.
> PGP fingerprint 655D 519C 26A7 82E7 2529  9BF0 5D8E 8BE9 F238 1AD4

So it sounds like I say:


and get myself the interface I want, on the right vlan but what happens
when I want to say:


That `.' is going to cause some problems isn't it?

I asked earlier for reasons like this and compatability in general if
there would be a way to create vlan interfaces named "vlan2" for

The trouble with this naming convention is it doesn't imply it's
physical device in it's name but the name doesn't contain a `.' which
in things like sh(1) can cause problems.

My patch may be a little more cumbersome, requiring explicit naming of
the device but it does eliminiate ambiquity and permit that naming
scheme with the ability to do DHCP and not trip over some other things
in rcNG.

Adam C. Migus -- http://people.migus.org/~adam/

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