Wes Peters wrote:
>
> "C. Stephen Gunn" wrote:
> >
> > On Sun, 31 Dec 2000 19:54:19 PST, Julian Elischer wrote:
> >
> > > > The current VLAN (and Ethernet) implementaiton in FreeBSD needs work.
> > > > FreeBSD should should handle multiple ethernet encapsulations on
> > > > the same physical interface, and relay packets to/from some subordinate
> > > > interface. This support would factor-out the need for current
> > > > work-arounds like if_vlan, and if_ef, and perhaps even if_tap.
> > >
> > > sounds like a perfect use for netgraph..
> >
> > I've thought about this, and and a migation to netgraph would
> > require significant changes to how FreeBSD handles Ethernet (and
> > other IEEE 802) interfaces.
> >
> > For example, you would no longer simply ``ifconfig xl'', but
> > associate a netgraph link-layer node on top of the xl interface,
> > and a netgraph interface node on top of the link-layer node, which
> > would function (mostly) like xl does now.
> >
> > Netgraph is an excellent technology. While your comment makes
> > sense, there are several issues that will need to be addressed.
> > For instance, the current ARP implementation in FreeBSD is
> > entangled with the generic ethernet code.
>
> Under netgraph, it would be just another protocol in a netgraph node,
> and could be added to (and removed from) the interface as needed. That
> would be interesting from the standpoint of a secure system over which
> you wanted to control the ARP entries. Being able to simply turn off
> dynamic ARP has been discussed often, but never really acted upon.
>
> Doing link-layer encapsulation modules is really not very difficult.
> I've written pretty much the full complement, covering ethernet (10,
> 100, and 1000), FDDI/CDDI, token ring, ATM, and Frame Relay. (Chuck,
> I can identify that protocol in 20 instructions.)
Under netgraph it's a real SNAP (I can't believe I said that)
>
> > I'm afraid to even contemplate the POLA and backward compatability
> > issues involved.
>
> Why would we need to violate POLA? The obvious default would be to
> extend ifconfig to configure the new protocol types, and to assume
> EthII framing unless explicitly specified.
send only new protocols out to netgraph.. no POLA to break.
>
> > If this discussion is non-casual, we should eventually migrate
> > it over to -arch.
>
> Perhaps so. If someone does the work to move EthII into netgraph, I can
> certainly contribute a SNAP/LLC module, and maybe even extensions to
> ifconfig so you can use it. ;^)
have a look at the ng_ether node.
>
> --
> "Where am I, and what am I doing in this handbasket?"
>
> Wes Peters Softweyr LLC
> [EMAIL PROTECTED] http://softweyr.com/
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