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Mac Forum / General / Hardware / July 2004



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Airport Extreme to ethernet bridging?

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jerry - 30 Jul 2004 11:44 GMT
Hi, all.

I'm having a bit of a problem with an Airport Extreme setup. It's
probably pretty basic, but so far the solution has managed to evade me.
It has to do with wireless-to-ethernet bridging.

I've got two computers -- a G4 desktop and a G4 PowerBook with an
Airport Extreme card. Both machines are running OS X 10.3.4. Internet
access is via DSL.

The DSL modem runs into the WAN port on a Linksys 4-port router. Also
connected to the router via straight-through cat 5 patch cable are the
G4 desktop unit and an Airport Extreme base. The patch cable from the
router to the base station is going into the base station's WAN port.
There's also an HP 2100 laser plugged into the router.

I can access the Internet from both the PowerBook and the G4, so it
would appear that everything is functioning correctly. The G4 can "see"
the printer. However, I can't get the PowerBook to "see" the G4 or
printer, or vice-versa.

On older Airport bases there was a checkbox labeled "Enable Airport to
ethernet bridging". According to the docs, this is automatically
enabled in the Airport Extreme base, but so far no good.

What am I missing? Any thoughts are greatly appreciated!

TIA,
--Bill Pulver
bill (_at_) quinn-pulver (_dot_) com
noman - 30 Jul 2004 12:09 GMT
> The patch cable from the
> router to the base station is going into the base station's WAN port.

I think this is the heart of your problem. See below.

> On older Airport bases there was a checkbox labeled "Enable Airport to
> ethernet bridging". According to the docs, this is automatically
> enabled in the Airport Extreme base, but so far no good.

I believe this would bridge between the wireless network and the AE's
lan port.  Bridging to the wan port doesn't make a lot of sense --
that would be routing, not bridging.

> What am I missing? Any thoughts are greatly appreciated!

Seems to me you want to wire this a bit differently.  I think you want
the LinkSys to act purely as a switch, leaving all the routing to the
AE.  In other words, connect the LinkSys wan port to the AE's lan
port; connect the dsl modem to the AE's wan port; and disable routing
in the LinkSys if you can.  Effectively what you're doing is giving
the AE multiple lan ports, which is all you really need.  If you can't
disable routing in the LinkSys, this should still work, just a little
less efficiently.

NB: I don't own an Airport Extreme myself, so take all this with a
grain of salt...
David Besack - 30 Jul 2004 18:08 GMT
> > The patch cable from the
> > router to the base station is going into the base station's WAN port.
>
> I think this is the heart of your problem. See below.

Right, the line needs to go from one of the Linksys router's 4 LAN ports to
the AEBS LAN port.  This lets all clients including the AEBS get it's
network ID from the Linksys router.

> Seems to me you want to wire this a bit differently.  I think you want
> the LinkSys to act purely as a switch, leaving all the routing to the
[quoted text clipped - 4 lines]
> disable routing in the LinkSys, this should still work, just a little
> less efficiently.

That could work too, but simply changing where the Linksys plugs into the
AEBS will solve it.
Neill Massello - 30 Jul 2004 20:39 GMT
> That could work too, but simply changing where the Linksys plugs into the
> AEBS will solve it.

No it won't. If the base station's default configuration is left
unchanged and its LAN port is connected to a LAN port on the Linksys
router, there will be be two DHCP servers on the local Ethernet network.
If DHCP is disabled on the base station, there will be no need to change
ports: both of its Ethernet ports will function as LAN ports.
 
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