Hi Anders,

Long message ahead.  I have replied inline for clarity.

On 28 Dec 2015, at 20:46, Anders Holmberg <[email protected]> wrote:
> Now when answering your message its a dsl modem with router built-in.
> I have that as a nat and use the airport extreme as a bridge.
> Maybe i should try to reverse the setting so that my modem is a bridge and my 
> airport is a nat.

Yeah, if you can.  Lets AirPort handle your public IP address, NAT, port 
forwarding, and all that.  However, maybe not the best option if your DSL modem 
is actually a better router because it handles your DSL connection at full 
frame sizes, without PPPoE overhead.  In my experience though, most ISP routers 
are horribly outperformed by hardware you get yourself, including AirPort.  It 
may even not be possible, for example PPPoA generally cannot be bridged without 
special hardware, forcing you to use your “Modem” as your NAT router.  You will 
need to investigate your options.  If you don’t mind, buy another modem; I 
recommend Draytek v130.  This will in fact bridge PPPoA, and pass PPP directly 
through to AirPort as PPPoE.  Now put your username/password into AirPort, and 
get a very nice, reliable setup, entirely controlled by AirPort.  This is a 
great way to turn any legacy DSL connection into Ethernet, and make AirPort 
work with any connection type.  These babies even support baby jumbo, so if you 
ever get an alternative router to AirPort that knows how to handle large 
packets, it need only support an Ethernet port to give you the full capacity of 
your DSL/VDSL connection.  I use one now; they’re very sweet.

> But how will i go with my other airport base stations i have?
> I have two airport express.
> Do i have to set them up to or will they automatically join the network?

Tell them to “Join” your existing network.  You can do this during the initial 
setup process; zap them with AirPort Utility to factory settings and you’ll be 
asked how to configure them.  “Joining” an AirPort network will see your 
Express configured as a WDS replicator.  You can then use the Ethernet ports on 
your Express to attach devices to your network, in addition of course to using 
it as a wireless extender and, optionally, AirPlay receiver and print server.  
Being able to wirelessly connect ethernet-equipped devices to your network is 
way cool. :)

There is an important catch I think you should understand, though.  Your 
wireless devices connected by way of the receiver are only capable of “N” 
speeds.  Moreover, only half of “N” speeds, theoretically.  Your bandwidth is 
chopped into half because the signal is now taking two hops, and the Express is 
not yet an AC-capable device.  A hidden preference, accessible only with the 
older AirPort Utility 5.6 available for Windows, can fix it so wireless clients 
do not associate with your Express devices, but this would of course render 
them rather useless as wireless extenders; they will then only be Ethernet 
extenders.  If you are finding that your speeds are particularly poor because 
of your Express extenders, and you really need your extenders to get the 
desired coverage, and you have no other means to wire your AirPort units 
together (Ethernet, HomePlug, etc), and perhaps because they are often 
providing the best signal at any given time, then I can only suggest you tell 
your Extreme to broadcast separate SSIDs for 2.4 and 5 GHz bands, and connect 
only your most critical high-throughput devices to the Extreme on 5 GHz, 
leaving the remainder behind on 2.4 GHz at “N” speeds, extended by your AirPort 
Express, and ensuring that your speed-critical devices are never dragged down 
to “N” speeds.  It’s either that, or get more AirPort Extremes as extenders to 
push out your AC network.

> I have a macbook which does not use an ethernet port.
> If i buy a thunderbolt to ethernet adaptor would this in any case decrease 
> the speed?

The Thunderbolt to Ethernet adaptor is not as high-performance as one might 
hope, but it will, in most cases, smash the performance of any wireless 
networks, including AC networks.  It’s always preferable to wireless just for 
reliability.  AC is supposed to be able to reach close to gigabit speed, but it 
is a rare thing indeed, if for no other reason than that most devices don’t 
have the radios for it.

You can configure wired and wireless connections on the same Mac.  OS X uses 
the correct one.  Plug in when you can.

There were a few reports of specific brands of modems not negotiating the 
correct speed with AirPort.  These should be very rare and are abnormal.  
AirPort Extreme has a gigabit port on the outside, and gigabit ports on the 
inside.  Cable should not give you any trouble.  I can confirm that you should 
get at least 200 Mb/s.

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