[SunHELP] Gigabit Ethernet?
larrys at lexis-nexis.com
Wed Feb 13 18:37:36 CST 2002
Not at all. Consider the case where a router proxy-arps for hosts
behind it. arp is the glue between layers 2 & 3. You can have
more than 1 layer 3 on 1 layer 2. You don't want to go the other way.
Kevin Stevens <Kevin_Stevens at pursued-with.net> wrote:
> Makes sense, thanks! Doesn't it freak out the arp tables of devices
> accessing this box when they see duplicate MACs for different addresses?
> On Wed, 13 Feb 2002, Larry Snyder wrote:
> > The heartburn comes when you have two _physical_ interfaces on the same
> > shared media with the same mac. You haven't added a physical, so
> > layer two doesn't have to guess where to ship the packet (actually frame).
> > I used 'ifconfig qeX ether (some hex mac)' to get around the physical
> > problem before I knew about the OBP local-mac-address directive, but
> > I had about 3 i/f's visible to the same switch from that box. Layer
> > three sub's are nowhere near as problematic :-)
> > -ls-
> > Kevin Stevens <Kevin_Stevens at pursued-with.net> wrote:
> > > On Wed, 13 Feb 2002, Larry Snyder wrote:
> > >
> > > > If they come up with the same mac address on two different ports on the
> > > > same switch (or vlan), you'll drive the switch nuts trying to decide which
> > > > port is right. ifconfig -a as root will tell you if this is the case,
> > > > and is a way to change it. It's also an option in OBP.
> > > > Good luck,
> > > > -ls-
> > >
> > > In this same vein, I need to assign a virtual interface to my 3Com NIC in
> > > an x86 Solaris box on the same network as the primary interface. First,
> > > there wasn't a local-mac-address variable set at all per eeprom - I set it
> > > anyway. I can create secondary interfaces, but the ifconfig ether option
> > > won't accept alternate MAC addresses. Just for the hell of it I created a
> > > secondary and addressed it with another IP on the same network. It
> > > doesn't seem to be freaking out, but for the life of me I don't understand
> > > why.
> > >
> > > KeS
> > > _______________________________________________
> > > SunHELP maillist - SunHELP at sunhelp.org
> > > http://www.sunhelp.org/mailman/listinfo/sunhelp
> > _______________________________________________
> > SunHELP maillist - SunHELP at sunhelp.org
> > http://www.sunhelp.org/mailman/listinfo/sunhelp
> SunHELP maillist - SunHELP at sunhelp.org
More information about the SunHELP