Airport Express dolling out different networks

Consider our airport express that, according to the airport express utility, shows the 10.0.1.x network as the LAN configured for DHCP for connecting computers. Despite this apparent configuration, my macbook air receives an address on the 192.168.x.x network, while at the exact same time, the Dell Inspiron receives an address on the 10.0.1.x network. The macbook is allowed through to the internet via it's 102.168.254.1 gateway received from the airport, while the Dell, though it can ping the 10.0.1.1 gateway is also receives from the airport, is not allowed onto the internet. Temporary fix was to manually configure the Dell with an IP address on the 192.168.x.x network. Power re-set of airport, computers, and DSL modem do nothing. I haven't seen any other posts to this issue. Anyone, anyone, Bueler? Many thanks.

I can find info on a Siemens Speedstream 4200. Is this the device that you have?
This device is a modem/router that is providing DHCP and NAT services. By default, this device hands out IP addresses to clients in the 192.168.x.x. range.
So, a device that connects to your 4200 gets a 192.168.x.x IP address. The manual for the 4200 confirms this:
SpeedStream Router - Optus Internet Help
The Apple routers use the 10.0.1.x range by default. Any devices that connect to the Apple are getting 10.0.1.x range IP addresses.
Even if you do not have the exact version of the 4200 in the link above, based on the info that you have provided, you do have two devices on the network, both provding DHCP and NAT services. You only want one device on a network acting as a router delivering DHCP and NAT service.
The AirPort needs to be configured in Bridge Mode to take it out of router mode so that any devices that connect to the AirPort will receive the same 192.168.x.x IP addresses as devices that connect to the 4200.

Similar Messages

Hello I have 2 seperate airport express systems on my network, each connecting to a stereo in a different room. suddenly, the one in the living room will not stop flashing amber, but the one in the bedroom works fine. I have already tried resetting it

Hello
I have 2 seperate airport express systems on my network, each connecting to a stereo in a different room. suddenly, the one in the living room will not stop flashing amber, but the one in the bedroom works fine. I have already tried resetting it with a pin, resetting it while plugging it in, and trying to find it in airport express setup (the setup assistant can't find it at all).
What am i doing wrong?

How do I configure the AX to connect to the hub's wireless network? It will only scan one base station Airport Express at a time in the Airport Utility. I think what I am trying to do is use the hub as a router to the two AX's. Is there a specific way to set this up?
To set up the AX to join a wireless network as a "Wireless Client," using the AirPort Utility, either connect to the AX's wireless network or temporarily connect your computer directly (using an Ethernet cable) to the Ethernet port of the AX, and then, try these settings:
Launch the AirPort Utility.
Select the AX.
If not already connected to the AX's wireless network, go ahead and switch to it when prompted.
AirPort Utility > Select the AX > Manual Setup > AirPort > Wireless
Wireless Mode: Join a wireless network
Network Name: <type in the network name/SSID of the wireless network that you want to join or select it from the pop-up menu>
Wireless Security: None OR, if you are using security on your wireless network:
Wireless Security: <Select the appropriate level of security for the existing wireless network: WPA/WPA2 Personal | WPA2 Personal>
Password: <enter your wireless network security password>
Verify Password: <re-enter the same security password>
Click Update to write the new settings to the AX.

Airport Express no longer joins network

Greetings, I have a cable modem internet connection; I use an older Airport Extreme (802.11n, without Time Capsule) to make a local wifi network with WPA2 Personal security, and an older Airport Express (802.11 b/g, firmware 6.3) to connect a laser printer in a different room.
All was working well until two days ago when access to the internet disappeared. I reset the modem, confirmed that the cable connection was working by plugging a laptop directly into the modem by ethernet, determining that the problem was the Airport Extreme. I discovered the 7.5.2 firmware update which I uploaded, and all seemed well.
However, the 27" iMac upstairs only connected to Airport intermittently; it appeared to have been duplicated in name, as well as only recognized the Airport Express. I've since been able to correct that problem, however, now the Airport Express no longer connects to the Airport Extreme network.
I've tried soft resets (unplugging then plugging back in) and hard resets (pressing the reset button with a paperclip until the amber light flashes, then reconfiguring the device). I've tried setting the Airport Express both just to join the network (printer sharing) as well as extend the network; I also reverted the Airport Extreme's firmware to 7.4.2 which works perfectly well. However, now after each successive attempt to reconfigure the Airport Express to join the network, Airport Utility says that the Airport Express has been successfully updated and will restart, which it never does - it simply flashes an amber light, and Airport Utility eventually times out and says that it was unable to find the Airport Express after restarting, noting that the settings have been successfully updated, but that there is a problem re-joining the wireless network/finding the device. Notably, the Airport Express no longer appears in the left hand list of wireless devices in Airport Utility.
Help!!

Hi pslebow,
You make it sound like there was no change, then suddenly the Airport Express 802.11g lost connection to the wireless network and you can't get it back.
What network security is your wireless network using?
From the specification sheet, "…When joining an existing wireless network, AirPort Express only supports WPA-Personal."
AirPort Express - Technical Specifications
Please make sure your router security is set to match.
iOS and OS X: Recommended settings for Wi-Fi routers and access points - Apple Support
If you have older Wi-Fi devices on your network that don't support WPA2 Personal (AES), a good second choice is WPA/WPA2 Mode (often referred to as WPA Mixed Mode). This mode will allow newer devices to use the stronger WPA2 AES encryption, while still allowing older devices to connect with older WPA TKIP-level encryption. If your Wi-Fi router doesn't support WPA/WPA2 Mode, WPA Personal (TKIP) mode is the next best choice.
Best,
Nubz

Problem using Airport Express to extend wireless network.

I'm trying to extend my wireless network with an Airport Express (brand new, bought last week), but can only seem to do so by connecting it via cat5 to the router, which doesn't actually extend anything. I have a Linksys WRT54GS with DD-WRT, and want to have the Airport Express in a different room so cat5 isn't an option.
I'm using WPA2 Personal security on my network.
I've tried to follow several sets of instructions from these forums and on blogs, but the only things I've been able to do are...
1) connect via cat5, selecting "Create a new network" with the same SSID and such, but it doesn't give me any more range.
2) connect wirelessly selecting "Join an existing network", but that doesn't extend the network at all either, even if I put the AE at the edge of the network now.
Thanks in advance. All I really want to do is access my wireless from the other half of my house.
Zack

It was possible to create a WDS between the older 802.11g AirPort Express and the Linksys WRT-54GS and this (as you know) has been documented on the Internet. However, I do not know of anyone that has been successful doing so with either of the 802.11n generations.
The two methods that you have tried would not work as neither is the proper method to set up a WDS. Please check out the following Apple Support article for more details. If you are successful in setting a WDS between them, please post back your results.

Adding a 2nd Airport Express to extend the network using WDS

I am a bit of a novice, but after I installed an airport express with my d-link wireless router to play itunes on my home stero, the music kept breaking up and stopping. I tried to change the channel, but it said mine was set on automatic and I cannot figure out how to change manually.
So reading apple's suggestions, they said to get another aiport express and extend the network with WDS. I purchased my 2nd express today and have been trying to install it using the airport express assistant. I have had to reset the 2nd express and the original several times. However, what i keep running into is after it gets through all the steps, it asks me for a password for "this basestation". I have read several help topics and it looks like i need to use "public" for this new airport express. I get through that step and then it gives me an unknown error (-6753). Does anyone know what this is? Or is there a way to set-up the 2nd airport express manually? Do I even need a 2nd one? Should I just get an airport extreme? Will that extend the range of my wireless network? Any help is greatly appreciated. I have been at this for about 6 hours now. My wife is going to kill me.

Will the manual for D-Link describe how to set up the
first airport express as a roaming network
No
do that via the apple settings once its connected via
ethernet cable?
Yes
Different channel.
Same network name, same security.
Ensure that distribute IP addresses (under Network) is unchecked.
When this is done, will I still be able to play
itunes through the first airport express?
Yes
Also, then once I do that with the first, then do I
just do the regular set-up for the second as a
network extender via the airport express assistant?
Yes
iFelix

Airport Express dropping out constantly so I can't print wirelessly

I have an iMacG5 running OSX 10.3.9. I have a DLink wireless router which creates my wireless network that the iMac connects to. Also, as my printer as at the other end of the room, I have an airport express connected via USB to the printer so I can print wirelessly. Everything worked like a dream for about 12 months. Until recently I had no security on this network and although I was aware this was risky, I was reluctant to change anything because it all worked so well. But my paranoia got the better of me and I changed the DLink to WPA security. Ever since then, the airport express has acted very strangely. The connection dropped and I was required to do a hard reset. I did that and everything worked. I felt so smug that I had worked out a computer issue! Little did I know that as soon as I shut down the system the airport express dropped out again. I have since discovered that I don't actually need to shut down for the thing to drop out. It just does it of its own accord.
I have contacted AppleCare 3 times and spent a total of about 4 hours on this to date. No luck. They suggested interference. However my airport icon usually shows either 3 or 4 bars and there is no difference when the thing drops out.
The only thing I have learned is that Airport Express does not have to be reset all the time. In my situation, it is best to just unplug it, let it rest for about 30 seconds and then you should be able to see the thing in the airport admin utility. It does take a while and several rescans in the utility, but eventually it does show up. This at least means I don't have to constantly set it up to join the network.
In fact, really it is a doddle to print! I don't know why people like to just go File-Print when you can go through the delight of getting out of your chair, unplugging Airport Express, waiting 30 seconds, looking at the dust under the cupboard thinking I really must get that, plugging the airport express back in, watching the light change from green to amber, to flashing amber, wait for it...wait for it...it's not happening....waiting...finally - green!. Back to the computer, go to Finder - Applications - Utilities - Airport Admin Utility, not showing up, rescan, not there, rescan, rescan, rescan, still not there, rescan, oh good, airport express is showing up. Now, go to Printer setup utility, delete the printer that is there, then add printer, select rendezvous, add my hp, OK......now I can hit File - Print.
Has anyone got any ideas on how I can join the boring legions of people who are oblivious to the joys of printing my way?

Hi,
I am currently replying to this as it shows in the iChat Community.
I have asked the Hosts to move it to Snow Leopard (you should not lose contact with it through any email links you get)
I also don't do Wirelss printing so I can't actaully help either.
10:01 PM Friday; July 29, 2011
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb( 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

How to Connect Airport Express to Existing Wireless Network (Client Mode)

I am posting this for everyone tearing their hair out trying to connect the Airport Express to your own existing home wireless network. After spending 2 hours last night installing this on my father-in-law's home network, I hope to be able to save someone else the agony we went through.
So here's the situation:
Say you already have your own home network set up, and all you want is to be able to use AirTunes to play music off iTunes into your speaker system. And, you don't need the printer sharing capability nor creation of another wireless network (2 of the features of Airport Express). Then this solution is for you - read on.
Unfortunately, Apple's user manual is very unclear how to connect Airport Express to your own network. When you look at the picture diagram they provide, they show Airport Express picking up its signal from another Apple-oriented base. This can make you think you need to buy another piece of hardware to make it work. DON'T If you read through the manual, the Support section here, etc., you will hear lots of talk about "Client Mode" - and that this is the only way to get it to work. Nice - but no one really tells you how to set up the Airport in client mode.
Do yourself a favor, toss that user manual aside and run these steps.
(Note: These directions assume your DSL/Cable Modem is hooked up to a wireless router or acts as its own wireless router)
1. Get a cat5 Ethernet cable (anything but an orange cable - that's a crossover cable) like you would use to connect your PC to your router to pick up the Internet.
2. Connect the Ethernet cable to the router on one end, and to the Airport Express unit on the other end.
3. Plug in your Airport Express unit to the wall (this will not necessarily become its permanent location - you will be able to move it later). The light will glow solid Amber for about 30-45 seconds while it starts up, then blink Amber. At this point, the unit is ready to operate.
4. Install the CD to the PC where your iTunes music is stored. This should be painless. Once you open the program, it should detect the Airport unit.
5. At this point, the on-screen wizard will present you with your options, and walk you through the setup. This is much like the user manual describes - and you should be good to go form here forward.
Some pointers:
- When asked if you want to create a new network, join an existing network, or connect via Ethernet, choose the middle option for joining an existing network. You will need to know the name of your network, the password to connect to the network (if present), and the type of encryption used on the network (e.g. WEP, WPA, etc.). Side note, WPA is recommended, as it is a higher level of security than WEP. You will be able to configure the Airport Express unit to automatically login to your network.
- I would recommend, when creating a password for the Airport Express unit, use the same password as your network, to avoid confusion.
6. The very last step will ask you to save the settings to the Airport Express. Here's the kicker - when you save the settings, you are TRICKING the Airport Express into no longer acting as a network broadcaster, but instead being a "slave" to your own network. What do I mean? You will lose the connection from your PC to the Airport Express - an error message will pop up telling you the unit can no longer be found. While you might think you did something wrong, you actually were successful!
7. Unplug your Airport Express, and disconnect the Ethernet cable from your router and the Airport unit. This will no longer be needed.
8. Go to your desired location where you want to plug in your Airport Express unit. Before plugging it in, connect your Audio cable from the Airport Express to your audio receiver. Once that is connected, then plug in the Airport Express unit. The light will glow solid Amber for 30-45 seconds while it loads, and then will blink Amber for a brief period of time before turning solid GREEN. When this happens, you have successfully connected the Airport Express to your home network!
9. Go back to your PC with iTunes. Open the Airport software - you should now have a listing for your Airport Express unit in the upper left. Click on this, and the wizard will guide you through connecting - you will need the password you created for the unit. You only need to go through this wizard once, and when finished, the software will tell you that can now use iTunes with your Airport unit.
10. Open iTunes. On the lower right, you will see a dropdown for Speakers, and it should be defaulted to My Computer. Click on that drop-down, and you will see the name of your Airport unit. Click on that name, and now your music will broadcast to the Airport unit!
11. Play a song in iTunes. Go to your audio receiver, and connect it to the channel for your external connection to the Airport Express unit. You should hear your music from iTunes. CONGRATULATIONS! =)
I hope these instructions were helpful - I am happy to answer any questions, so feel free to contact me, *******************@*****.**.
<Edited by Moderator>

Thanks for the detailed directions. You are absolutely correct in stating that people should toss the user manual; it's pretty worthless. I have had a problem setting up my new Airport Express as I have described in an earlier post - http://discussions.apple.com/thread.jspa?threadID=1839873&tstart=45
One quick question - does using your setup process set the AE up as part of a distributed network where the AE is acting as a wireless router where it is extending the range of your network? Or, is it simply a wireless connection to your stereo for iTunes? I am interested in having both, since my AE will be at the other end of the house from the main wireless router.
Thanks

After the Airport update today, Airport Utility no longer sees my new Extreme or my 2 new Airport Express relay stations (same network); however, my internet is working and all Airports are green?

After the Airport update today, Airport Utility 6.0 no longer sees my new Extreme or my 2 new Airport Express relay stations (same network); however, my internet is working and all Airports are green? I'm running Lion on my iMac and updated when Airport Utility prompted me to do so a few hours ago. After applying the updates is when Airport Utility stopped seeing my routers. But they are working? Thoughts?

Did you remember to completely power cycle the entire network?
You would want to do this after any update or change to the network.
If you did not do this yet......things are out of sequence.
Power off everything on the network.....all devices.....power down order is not important
Wait a few minutes
Start the modem first and let it run a minute or two by itself
Start the next device connected to the modem the same way
Work your way out on the network starting each device about a minute apart
Check the network

Airport express connect to existing network problems

Hello everyone, my thanks in advance for any help you can provide. I know this issue has been raised in various forms both on this forum and elsewhere on the net, however no solution so far has worked for me.
I have been trying to add my airport express to my existing wireless network in order to extend wireless connectivity in my lounge room and provide airplay functionality to my stereo. Previously, with my last router and ISP i had the same setup working fine but now i cannot for the life of me get it working again.
I have BT infinty internet and am using a TPLink WR1043ND router in place of the home hub that BT supplies. My wireless internet connection is fully functionning and everything service-wise is fine.
I have tried to connect my airport express (n) to my network and all seems to go well but despite everything i try i always end up with an express with solid green light that is not recognised wirelessly by airport utility 6.0 or as an output option in itunes. If i connect the express to my MBP via ethernet i can access the express to configure manually but modifying the settings have thus far had no effect. The express is listed in the device list of the router menu and in the express settings has the correct ip issued via dhcp from router, as well as subnet mask and router address. Primary and secondary DNS have been copied from my router settings. Network mode is set to join existing network, correct wpa/wpa2 key is input, and airplay is enabled.
Despite all this seemingly being correct, when i disconnect ethernet connection betwein express and mbp - airport looses the express from ethernet connected devices (obvs) but when i select wifi connected devices it states no configured base stations can be found. The express remains listed in the dhcp client list of the router though and the express green light is there!
I have tried factory reset of the express a number of times and gone through the setup process and receive the same result. I have reset the modem, router, express and powered down the mac a number of times, still to be faced with same result.
I am at a loss and hope that you can help

Okay so i've fixed it....
Decided to bite the bullet and engage Apple support and although the agent i spoke to tried very hard he was as baffled as i was. In the end (after nearly an hour) i was put on to a support manager who simply told me that the Airport Express joining non-apple router hardware is just not supported. A very very disapointing cop out of an answer and a bit of a let down from Apple. So i expressed (no pun intended) my disatisfaction and left the conversation.
Determined not to be beaten i had one final go and lo and behold got it running. Problem was with the firmware on my router! After i updated to the very latest there now seems no problem with the Express.
It was an elementary mistake, i was trying so hard to fix the problem i forgot to check the basics!!!
Hope this helps anyone else who may be having the same difficulty

Airport Express dropping out

I am using an airport express to join my network and have connected a network printer to it using and ethernet cable. I have previously used this airport express to connect a windows PC and never had a problem. I recently purchased an iMac to replace the windows PC and no longer need the Airport for the windows PC, so I am now using it for my network printer. The problem is that the Airport now keeps dropping the network. The Yellow light flashes momentarily and then re-connects, and while this is happening my printer is not on-line. The funny thing is that it only happens when the iMac (which is only several feet from the Airport express) is on. If I put the iMac to sleep it works fine. If I reboot the iMac it works again for a while but eventually starts dropping out again. I have tried power-cycling the Airport and printer but to no avail. Any suggestions would be appreciated. Thanks.
P.S. all software and firmware are up to date for both the iMac, the Airport Express, and my Airport Extreme.

Welcome to the discussions!
By close the laptop, do you mean it goes into standby or a sleep mode? Or, are you using a larger monitor, closing the laptop and not using the laptop screen?
If it's the former, you need to check on the HP to see if there is a "remember this network setting", "stay alive" or something similar so the connection is not lost.
When you close the lid on the HP, it is probably blocking access to the internal antenna within the laptop. If the top is closed, the only way the radio waves can be seen would through the sides of the laptop.
Unless you are seeing intermittent drops in the wireless connection when the laptop is open, it sounds like the Express is delivering a constant wireless signal. Download www.istumbler.net to get a good look at the signal strength and noise on your network. The strength indicators on most laptops are not very accurate.

Why won't my airport express work as a network extender since upgrading to iOS 6?

I have the AirPort Extreme as my. Network and the airport express set up as my network extender. However, since I upgrade everything to IOS6 my airport express is no longer acting as the network extender. How can I fix this issue?

I have an iMac, iPad, Apple TV and Panasonic tv on my network. The apple tech when I first bought the extreme 2 months ago had me set up the extreme as the main network and the. Airport express in a different part of my home as the extender to my network so we could use the wifi outside to my entertainment area and now to get wifi outside since upgrading my devices I can only get wifi outside if to stand next to the back door.

Airport Extreme and Airport Express on Ethernet Wired Network

I recently did work on my house and now have the house hard-wired for ethernet. I have an AirPort Extreme in my home office. That signal does not reach past the old part of the house (brick apparently blocks some of the signal). So I want to use my Airport Express in the new part of the house to have wireless in the new part as well.
Currently, I have the Airport Extreme plugged into the network, with the Airport Express plugged into the network in the new room. I get wireless connection in the office, but not in the new room.
I am not sure how to configure the base stations.
-- Do I need to use WDS? I am not currently, because each wireless router has its own independent wired link to the network.
-- Do I need to call the wireless networks by different names? Currently I have them both called the same thing.
-- Do I need to set the Airports for a different channel? Currently I have one on 10 and one on 11.
This should be very simple. Unfortunately, my experience has been that the Express base station is very difficult to configure, very quirky and not for the average user.
BTW, the Express is hooked up to the stereo and iTunes plays through that-- but remember it is a hard wired connection. Also both Airports show up in the Admin Utility, so no problem there.
Thanks.
~aviduser
1. Macintosh SE (1988)
2. PowerBook 180 (1993)
3. PowerMacintosh 7600 (1996)
4. PowerMacintosh G4 (2001)
5. PowerBook G4 12" (2003)
(Oh yeah, and there was the Newton MP2k)
G4 867 Quicksilver Mac OS X (10.3.9)

Do you have another router?
If not:
Connecting them together via Ethernet should be done like this:
Internet -> [WAN] AEBS [LAN] --> AirPort Express
The AirPort Express should so that the option to distribute IP addresses is disabled. The AEBS and Express should have the same network name and encryption configuration. The AEBS and Express should be on different channels.
This configuration will put all the computers on the same subnet. All of the computers will get IP addresses from the AirPort Extreme base station (AEBS).
OR connecting them via wireless should be done through WDS. The hardware connection should be done like this:
Internet -> [WAN] AEBS
The AirPort Express should not be connected to Ethernet.
See KB 107454, AirPort Extreme and Express: Using WDS to create a network from multiple base stations.
If you do have a router, then both AEBS and Express should be configured so that the option to distribute IP addresses is disabled. The hardware connections should be set up like this:
Internet -> router -+-> [WAN] AEBS [LAN]
....................|-> AirPort Express
The AEBS and Express should have the same network name and encryption configuration. The AEBS and Express should be on different channels.
This configuration will put all the computers on the same subnet. All of the computers will get IP addresses from the router.

Quick and easy airport express question [expanding my network]

I have an airpot express unit, it works great, i have plugged in to my internet using an ethernet cable, I just want to know something: can i expand my network?? make it bigger?
I have airport express in my room, can i plugg another airport express on another room, make settings so that new airport express joins my current network, and like expand my internet connection, my problem is that i live in a house made out of concrete so, walls are really big and not thin at all, so when i go downstairs i loose my internet connecion, can i expand this with another airport express without having to connect the ethernet cable to the new airport express? I hope its not to confusing

Yes you can, when you plug the 2nd Airport Express in there is an option to join or extend an wireless network. This is what you would select to expand / extend your existing wireless network to other areas that may have a weaker signal.

Airport Express, Apple TV & My Network

Okay, I'm not sure if this will work.
I have 2 computers in my office.
My DSL connection is there, under a thick heavy, unmoveable desk and shelf.
My Mac Pro connects with Ethernet, My iMac G4 (spiffed up) connects with airport extreme.
The wireless signal doesn't go very far in my small house.
Can I extend my signal with airport express and will it be like wireless go between?
My big tv and new apple TV (opening it on Christmas) are in the other part of the house.
I can get a neighbors internet signal back there, but I can't see my own network back there.
Will I be able to access my iTunes on the desktop computers if I can only use my neighbor's signal and not mine?
I'm having trouble figuring out how my Apple TV is going to work. Plus my new iPad (another Xmas gift) will need a wifi signal back there too.
Any suggestions would be helpful.
thanks,
ANNE Z

Now I get a message on my airport express that my 2 networks can't be extended.
what am I doing wrong?

How to connect a 2nd airport express in a home network?

I'm triying to connect a second airport express in my home network but when I plug in and go to Airpot Utility says :
"This version of AirPort Utility doesn’t support this base station. Go to AirPort Service and Support for more information."
I don't know what to do to get connect the second airport exprees?, Do I miss something ?

You need AirPort Utility 5.6 to configure that model Express. The problem with that version is that Mountain Lion will refuse to let you install it.
This dilemma is easily solved. You simply need to extract the app from the installer package using a package extractor like Pacifist or unpkg. Pacifist is shareware, unpkg is free.
Download Pacifist here: http://www.charlessoft.com/
Download unpkg here: http://www.timdoug.com/unpkg/
Download AirPort Utility 5.6 here: http://support.apple.com/kb/DL1482
When the AirPort Utility .dmg file finishes downloading, open it to expand and reveal the AirPortUtility56.pkg package installer file.
Directions for Pacifist (I do not have screenshots for unpkg but the idea is similar):
Open Pacifist and from its File menu, navigate to the package and open it.
Click the "reveal triangles" until you see AirPort Utility 5.6.app:
Select it and then click Install from Pacifist's toolbar. It will then be installed in your Utilities folder, and you can quit Pacifist.
Mountain Lion will not allow you to delete its existing version of AirPort Utility. Just ignore it. It and the older version (which will bear the unique name "AirPort Utility 5.6") can peacefully coexist.
If you happen to have an archived copy of the AU 5.6 app somewhere, such as a Time Machine backup or equivalent, you can simply restore it or drag the app to your Mountain Lion system's Utilities folder instead of resorting to the above procedure. It will run without complaint. It is only the package installer that is the problem.
If you have an older computer with a version of AirPort Utility earlier than 6.0, you can administer it that way as well.

Airport Express dolling out different networks

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