Configure protocol with airport extreme base station

Need powerbook g3 wireless internet compatible password. roamabout 802.11b cabletron card does not have wpa password option. There does not appear to be a compatible encryption type to use airport extreme base station with this card.

...should I have AirPort on my iMac turned off or on...
Since you are connected via Ethernet you would turn AirPort off.
Does the connection automatically default to Ethernet, even if AirPort is set "on," because presumably Ethernet is faster.
No. It gives priority based on how they are ordered in the list of network connections.

Similar Messages

Configure TC and Airport Extreme Base Stations with different channels

I had to do some serious workarounds to use the Airport Extreme Base Stations as an access point with the same wireless network name primarily due to channel overlap. I thought I would post my results here since I didnt' find a good article online.
Also, I found the Snow Leopard verison (5.4.2) of the Airport Setup Utility far superior to Lion's Airport Utility (6.x) in terms of advanced setup.
Setup is a 3 flloor house where the 3 wired network locations have wireless overlap. The problem was that the access points would not hand off the wireless signal because the channels for each airport/TC were automatically set to the same channel. In non-apple setups, this is how you force a wireless client to switch access points (since the wireless software on your client/mac/windows can detect which access point is stronger and moves to the alternate channel.
Using apple's "Extend this wireless network" option removes any ability to manually configure wireless channels. I am writing this from memory, so feel free to ask questions and I will track this topic:
Procedure
Setup time capsule as your base station. Do all the setup for your wireless and guest networks. Manually configure the network and change the wireless channel to a specific channel for a/b/g networks (e.g., 3) and n networks (e.g, 167).
Plug your first airport extreme/access point into your wired network. Do not plug it into the "internet" ethernet plug, use one of the 3 ethernet switch locations
Use the airport utility to first configure it to "extend" your wired network.
Then, go in and reconfigure it manually in the airport utility. Choose the option to setup a "new network" and name the network the same as the TC wireless network name, security, etc.
Change the channel from "auto" to a different channel than the TC (e.g., 6 and 137).
Now go to the top tab and click on the "internet" icon
Go to the DHCP tab and change it to "bridge mode." This will tell the AE to not give out IP addresses (the TC will do this for you). If you get an error that the IP ranges conflict, you have not done this
Note that if you have a guest network setup, you will need to set this up on the AE as well.
Now test your airport setup. Take your client (macbook, iOS device) and connect to your network. Move to a spot near the TC and pull up a web page. Keep an eye on the signal strength and beginv moving toward the AE. Refresh the page as you move around. You should at some point see the signal strength increase. Refresh your page again. You should be now connected to to the AE. I have found that Macbooks do a better job than iOS devices because you get an extra signal bar to measure strength, and they have larger antennas which allows you to better measure problems with handoff
Another test you can do is to start backing up on your TC and then test the move. The handoff will truly show you that the TC is handling the process but the AE is relaying to the TC for backup.
If you need to setup another AE, simply follow setups 3-10.
I hope this helps others. I've done this setup 100 times on Linksys devices and although they are cumbersome, they at least allow me to do this setup much more quickly and easily than the apple products.

I had to do some serious workarounds to use the Airport Extreme Base Stations as an access point with the same wireless network name primarily due to channel overlap. I thought I would post my results here since I didnt' find a good article online.
Also, I found the Snow Leopard verison (5.4.2) of the Airport Setup Utility far superior to Lion's Airport Utility (6.x) in terms of advanced setup.
Setup is a 3 flloor house where the 3 wired network locations have wireless overlap. The problem was that the access points would not hand off the wireless signal because the channels for each airport/TC were automatically set to the same channel. In non-apple setups, this is how you force a wireless client to switch access points (since the wireless software on your client/mac/windows can detect which access point is stronger and moves to the alternate channel.
Using apple's "Extend this wireless network" option removes any ability to manually configure wireless channels. I am writing this from memory, so feel free to ask questions and I will track this topic:
Procedure
Setup time capsule as your base station. Do all the setup for your wireless and guest networks. Manually configure the network and change the wireless channel to a specific channel for a/b/g networks (e.g., 3) and n networks (e.g, 167).
Plug your first airport extreme/access point into your wired network. Do not plug it into the "internet" ethernet plug, use one of the 3 ethernet switch locations
Use the airport utility to first configure it to "extend" your wired network.
Then, go in and reconfigure it manually in the airport utility. Choose the option to setup a "new network" and name the network the same as the TC wireless network name, security, etc.
Change the channel from "auto" to a different channel than the TC (e.g., 6 and 137).
Now go to the top tab and click on the "internet" icon
Go to the DHCP tab and change it to "bridge mode." This will tell the AE to not give out IP addresses (the TC will do this for you). If you get an error that the IP ranges conflict, you have not done this
Note that if you have a guest network setup, you will need to set this up on the AE as well.
Now test your airport setup. Take your client (macbook, iOS device) and connect to your network. Move to a spot near the TC and pull up a web page. Keep an eye on the signal strength and beginv moving toward the AE. Refresh the page as you move around. You should at some point see the signal strength increase. Refresh your page again. You should be now connected to to the AE. I have found that Macbooks do a better job than iOS devices because you get an extra signal bar to measure strength, and they have larger antennas which allows you to better measure problems with handoff
Another test you can do is to start backing up on your TC and then test the move. The handoff will truly show you that the TC is handling the process but the AE is relaying to the TC for backup.
If you need to setup another AE, simply follow setups 3-10.
I hope this helps others. I've done this setup 100 times on Linksys devices and although they are cumbersome, they at least allow me to do this setup much more quickly and easily than the apple products.

Networking with AirPort Extreme Base Station

I am connected to the Internet with an SBC dsl modem, which I have had for a couple of years with few problems. However, I have been having issues networking my Mac G5, 1.8 Mhz machine since I purchased it some time ago.
In the beginning (before the Mac or -- BM as I like to call it) I was using a D-Link DI-614+ router and running a desktop PC and a laptop PC wirelessly with success. Then I bought my Mac (which I dearly love) and introduced it into my wireless network. At first it seemed to work OK. Gradually and occassionally it would lock up while trying to access an Internet site. Often the problem was resolved by rebooting the DSL modem, the D-Link router and all the computers. This would give me up to several days with no problems, but then things would rapidly deteriorate and I would have connection problems again.
I thought that if I bought an Airport Extreme base station, that would solve the problems but again, at first things were fine, then rapidly went downhill. I have worked exensively with SBC dsl techs and we have determined that the problem is not with the SBC network or with their dsl modem.
As it stands now I only get a maximum of a couple of hours of time before the slowing down of the network begins. Some of the error messages I get seem to indicate that there is a problem with the distribution of IP addresses. TCP/IP is set to use DHCP, and I connect by setting PPPoE to my SBC connections settings. "Connect using PPPoE" is unchecked. Location is currently "Automatic" although I have used the connection assistant a number of times in an attempt to get the system up and running.
I have the same problems in interconnecting the Mac with the two PCs that are on my system. In fact this is even more erratic than connecting to the Internet.
I have spent many hours with my limited knowledge of these things trying to resolve these issues but have had no success. I have scoured .Mac and other Internet sources and cannot find any specific solution to this problem. I am at a real loss as to where to go next. I am hoping someone here can help or point me in a direction where I might find a solution.
Thanks,
Don
Power Mac G5 Mac OS X (10.4.7)

Thank you very much for your response. Yes, the Mac is set to use PPPoE and the SBC information is stored there.
Just to clean things up, I removed the PPPoE configuration on the Mac and left it unchecked.
Here is other information about how the system is set up.
Note: + means item is checked, - means item is unchecked
Apple Base Station V5.7
WAN Ethernet Port: Automatic (Default)
+Enable SNMP Access
+Enable Remote Configuration
-Enable Default Host at
+Enable Remote Printer Access
-Enable NAT Port Mapping Protocol
Internet:
Connect Using: PPP over Ethernet (PPPoE)
+always stay connected
Network:
+Distribute IP addresses
Airport client computers:
+Share a single IP address (using DHCP and NAT)
((Use 10.0.1.1 addressing))
Power Mac G5 Mac OS X (10.4.7)

Importing Snow Configuration to the Airport Extreme Base station

Is it possible to import the Snow's airport saved 'base config' and 'access control list' files to the Airport Extreme Base Station when setting up the extreme? I'm considering upgrading my wireless system. I have 4 XPs and 4 Macs and would prefer not to have to re-enter any of this data or loose any downtime reconfiguring all my computers.

As far as I am aware this is not possible.
However if you configure the Airport Extreme BEFORE you turn off the Snow the downtime should be minimal.
From a security perspective, unless you have Macs running 10.2 or earlier and/or your PC wireless adapters don't support it, all you really need to do is implement WPA for a secure wireless network.
Personally to avoid potential issues I would create a completely new wireless network with a new network name. Some clients have issues with joining a new wireless network with the same network name as a previous network, especially one with a password.
iFelix

Communication errors with airport extreme base station

Please help.
I am able to surf the internet wirelessly on my two macs via my Airport Extreme Base Station. However I am unable to print wirelessly via my new HP printer connected to the USB port on the base station.
More worryingly I am unable to use Airport Admin Utility, Airport Set-Up Assistant or Airport Firmware Updater. Whenever I try to use one of these applications they experience errors communicating with the base station. I wonder if this is related to the printer problem?
I have performed soft and hard resets on the base station in addition to removing the power cord - none have been sucessful.
Can anyone please help me.

I may have a solution. I recently upgraded from an ibook to a macbook pro, and had the apple store "migrate" my files, etc., from one to the other. Got it home, everything's fine, airport conects, no problem. Go to print, can't print, decide to run Airport Setup Assistant to reconfigure (why not ?) and, lo. when it gets to "Network Configuation," I get : "An Error Occured while trying to communicate with this base station." Try all the usual tricks, including hard restart (internet connection is fine throughout), but the set-up assistant couldn't get past that point. Talked to apple support, we ran through all the options. He did suggest wiping the network preferences for airport off the harddrive and starting over, but since I had a good internet connection, I decided to wait.
So here's the thing: I got on Airport Administrative Utitity, clicked "Configure," and then "Network." I know next to zip about advanced options, but I decided to click "Distribute IP Adress" And under "Airport Client Computers" selected "share a single address." I left everything else alone. It reset to to the new options, and then, out of curiosity, I opened up set-up assistant, and TA-DA, I got past the screen I was stuck on, and when the next asked me if I wanted to keep all the same settings, I said yes. I kept selecting "Keep/yes", and then saved or okayed the changes. I then got a message that it would restart base station, I was also configured to print (my printer hp laser 1320 was plugged into the base station for all this), and, yes, it does now print.
I don't know if this is the hard way of doing something that I could have done more easily, and/or if even though I had an internet connection, the base station or the set up was still looking for the ibook. I'm sorry for such a long reply, but wanted to include all the steps I took and the exact situation. Does anyone know if I've endangered my security by checkig the "Distribute IP option ?" This is a home computer. Good Luck and hope this helps someone

Magic Packets with AirPort Extreme base station

Ok, so I would like to be able to wake my iMac with magic packets over the internet. It is connected to the internet via an AirPort Extreme base station, and I know that it won't work over wireless networks, but the iMac is connected and gets internet via ethernet from the AirPort. Is there any way I can set up port forwarding or something like that to wake my iMac remotely?

...should I have AirPort on my iMac turned off or on...
Since you are connected via Ethernet you would turn AirPort off.
Does the connection automatically default to Ethernet, even if AirPort is set "on," because presumably Ethernet is faster.
No. It gives priority based on how they are ordered in the list of network connections.

Several PC and Mac connectivity issues with Airport Extreme Base Station

Hello,
This is not all necessarily airport base station related, but there is some crossover, so I'm posting all of these issues...
Here is the laundry list of things that I can't make work in a home network that contains a PC w/ XP Home, MacBook 1.83 w/ 10.4.7, and Airport Extreme Base Station w/ Modem.
1. Can't see the PC from the Mac.
a. "Connect to server -> Browse" does not find the PC
b. "ipconfig" on PC provides valid looking IP address
c. ping from mac to PC IP address times out
d. Firewall on XP is disabled via control panel
b. Windows file and printer sharing is enabled
2. Can't see mac from PC
a. Windows file sharing enabled on mac
b. Firewall on mac disabled
c. I used \\MacIPAddr\shortusername
d. ping times out
3. Using dial-up to access internet, how do i tell airport to dial using PC?
a. this feature is working fine from mac
b. If already connected (via instruction from mac), can surf the internet fine from PC
c. Is this even possible from the PC?
4. Can't see printer connected to base station from PC
a. See it fine from mac
b. How do i "find" the printer on the PC?
c. Is Bonjour required for this? (I don't have it on the PC yet)
5. Can't see a "shared" printer on the PC from the mac
a. printer is connected directly to PC
b. Mac's add printer wizardry looks like it may "see" the printer, but then it asks for username and password for PC. This is XP home, with no usernames or passwords. Single user. Nothing seems to work in the credentials pop-up dialog.
Any suggestions on any of these issues is very welcome.
Thanks

Is the PC running any kind of internet security or firewall software?
1. Can't see the PC from the Mac.
2. Can't see mac from PC
Sharing files between an XP PC and a Mac running OS 10.4.x
http://www.ifelix.co.uk/tech/3020.html
3. Using dial-up to access internet, how do i tell
airport to dial using PC?
Jon Sevy has a Java Utility for this purpose.
You will need Java in order to run the utility
http://www.java.com
4 . Can't see printer connected to base station from
PC
Printing from a Windows XP PC to a printer attached to an Airport Extreme Base Station or Airport Express
http://www.ifelix.co.uk/tech/1004.html
Printing from a Windows XP PC to a printer attached to an Airport Extreme Base Station or Airport Express using Bonjour
http://www.ifelix.co.uk/tech/1008.html
Problems with finding Printer Driver on Windows XP when using printer connected to Airport Extreme or Express
http://www.ifelix.co.uk/tech/1012.html
5. Can't see a "shared" printer on the PC from the
mac
Printing to a printer on a XP PC from a Mac running 10.4.x
http://www.ifelix.co.uk/tech/3015.html
Printing to a printer on a Mac running 10.4.x from a Windows PC using Bonjour for Windows
http://www.ifelix.co.uk/tech/3014.html
iFelix

Printing wirelessly to MacBook Pro with Airport Extreme Base Station

I have an Airport Extreme Base Station that I used to use wirelessly until I got Verizon Fios. The Fios technicians said the base station couldn't be used and so it's been sitting unused for a few months. However, I really, really miss printing wirelessly, and was wondering if it was possible to use the Airport Extreme Base Station ONLY to print wirelessly, and not connect it any way to my internet (I don't want to mess with any of the fios stuff at all).
If it's not possible, is there any other way to print wirelessly without purchasing another product or special printer. I have a HP c4480 printer.
Thanks!

If your printer has a USB cable the easy way to go about this in my opinion is to plug that USB cable into your Extreme base station. I have the Extreme ABS that looks like a flying saucer. I plug the usb cable into the port that has the symbol that doe NOT look like this <--> rather it looks like a Saguaro cactus.
My computer then sends print documents to the Extreme via WiFi and then Extreme sends them to the printer via the USB cable.
If your Airport status is not showing in the Mac's menubar go to system Prefs/Network/Airport and check a little box so it will show up in the menu bar.
Now if your Extreme is plugged in the wall and powered up your Mac should be able to find it. Click on that menubar item for Airport and scroll down and select your Airport Extreme. I don't know for sure what its name will be. It should still be the same as it used to be when you used it last.
Now try printing a simple document. In the print dialog window you should be able to select what printer you want to use. If your new Extreme printer is listed select it. You may need to click on Print & Fax and figure out how to select it from there, and choose it to be the new default printer.
I think this info will do the job. Whenever you want to print you have to go to the Airport icon in the menubar and change your airport connection from your Verizon stuff to your Extreme. Then of course you have to change back when you are done. That is why it would be great to toss the Verizon WiFi radio out the window and just plug your Verizon modem into your Extreme WiFi radio transceiver (router). But I understand you cannot deal with that at this time.
If this does not do the job, if I have missed something, I will bet you 5 bucks that you can still figure it out if you just look at any error messages and/or look at the Print&Fax prefs and the Print dialog windows etc. and see what I may have missed. Maybe you have to go to SystemPrefs/Sharing and allow your printer to be shared. I don't think so. The way I figure any of this stuff out is to just look at stuff and think and try things and see what happens.
Your Verizon setup should be something like this.... a cable comes into your house and goes to a 'modem'. From there and ethernet cable (CAT-5 cable) goes from that modem to your Verizon router (WiFi radio transceiver).
As for getting rid of the Verizon router, when you are ready to give it a go, simply unplug the ethernet cable (it has a plug on the end that looks like the kind of plug that telephones use to plug into the wall, except it is a bit wider, but still has that same kind of snap-lock tab) that comes from the Verizon modem (the modem has the heavy round cable and probably many blinking lights) and plug it into the Extreme. Mine has an icon on the Extreme that is many dots in a circular pattern.
At this point you may have to unplug the Verizon modem form the wall AC power and the Extreme also. Then plug them back in, wait a minute, go to your Airport icon on your Mac menubar, Select Extreme and start surfing the web.
It really is that simple with a Mac. Maybe Verizon has found a way to make things difficult but my guess is no. Any password should be taken care of in your Airport Setup Utility program. It should be the same password(s) as you used before when you used your Extreme.

Using an External USB soundcard with Airport Extreme Base Station

Hello, I own a macbook, an airport extreme base station and a Native Instruments Audio Kontrol 1 USB 2.0 external sound card that works like a charm with my macbook. I have a printer and a hard drive connected to the USB from the Airport base station through a hub, and I was wondering if there is any way I could make my macbook recognize the external sound card when connected to the base station's USB port. I would like to be able to play music wirelessly through the base station but the application/driver from Native Instruments does not recognize the sound card plugged to the router.
Thank you

if there is any way I could make my macbook recognize the external sound card when connected to the base station's USB port
First welcome the the Apple Discussions Forum!
To your question - it's highly unlikely, sorry!

Printer that works with Airport Extreme Base Station

Hi. We are very new to Macs (2 weeks). Have a Mac Book and AEBS. Both work fine. Our HP printers, however, only work if connected directly to the Mac Book. I'm informed that we need to get a printer that works with the AEBS if we wish to have wireless printing. If anyone can recommend a printer that works with AEBS, we'd be grateful. Thanks.

Hello Jungle-cat. Welcome to the Apple Discussions!
Check out the following iFelix site to see which printers are known to work (not not) with the new 802.11n AirPort Extreme Base Station (AEBSn).

Can no longer configure modem in Airport Extreme Base Station

We've been using our AEBS to connect to our ISP via its internal modem for several years. Recently, I needed to update some ISP information for the modem connection and did so successfully using Airport Admin Utility. Two days later, tried to change additional settings, but AAU no longer shows "Modem (v.90)" as a "connect using" option on the Internet page. In fact, all of the options are greyed out except Ethernet, PPP over Ethernet and Airport (WDS). What happened?
I've reloaded and updated all of the Airport utilities, updated the AEBS firmware, power-cycled the AEBS . . . everything, but nothing fixed the problem.
I've tried this from two systems running 10.3.9 and one running 10.4.7.
I'm desperate. We live in the mountains of Colorado and until recently our only option for Internet access has been modem. Next week, however, we'll be installing a dish for access via an antenna on a nearby mountain. I'm concerned that I won't be able to reconfigure the AEBS for broadband. It's also possible that we'll still need to use the modem to connect to work, so I'd like to be able to switch AEBS configurations at will.
I'll be most grateful for any suggestions offered.
iMac G5 Mac OS X (10.3.9) also iMac G5 running 10.4.7 and a couple of laptops

Not yet. Maybe I'll try that next. The problem is that the 1-second reset only changes the password, but the 5-second really hard reset will wipe out all the settings and return the AEBS to default settings. If I still can't get to the modem configuration in AAU, then I've just lost all ability to connect to the Internet. (The modem in my computer got fried during a really, really bad lightning storm - zapper came in through the phone line even though it was connected through a surge suppressor - such is life on the Frontier!)
The modem in the AEBS is working because that's how I was connected to the Internet last night when I wrote the question, but I just can't configure it anymore.
I'll can give the hard reset a whack, but it makes me anxious. I may do better to just wait until my broadband link is installed and then configure the base station for Ethernet. At least that option seems to still be available.
Thanks for the response.

Airport Extreme Base Station and xBox wireless

We have 2 macs with Airport Extreme Base Station connecting to Cable modem for internet connection.
Recently bought an xBox with a USB wireless adaptor. When xBox is connected to the wireless network, internet connection of other computers dropped out and no longer can use internet until xBox is disconnected from the wireless network. It is the same problem even other computers are connected to Base Station with Ethernet cable.
Any settings in Airport Utility might fix this problem ?

We didn't have any problem before using the xBox wireless.
There are 2 Macs (iMac 20" & Macbook Pro 15") and they're connected to the Base Station via wireless.
The cable modem is Motorola Surfboard SB5100i and there is no login required from ISP for internet connection. Yes, the modem is connected to the WAN port of the Base Station.
With the Clients computer network settings, we are using DHCP. We have also tried with static IP and didn't make any differences.
I thought it could be the compatibility issue between the xBox wireless adaptor and the Base Station and on the other hand, the wireless protocols (802.11N/g/b) are industry standard and it doesn't matter who made them, they should work together.
The only idea that I have now is to try with other brand of wireless router and it might be a quick solution for this problem.
thanks,
David

Comcast HSI, AirPort Extreme Base Station issues

Recently, I've been having some connection issues with my Comcast High-Speed Internet and my AirPort Extreme Base Station. I'll be connected fine one minute, and the next my AirPort monitor drops to 2 bars of signal and nothing will connect. Resetting the base station and the modem works about 50% of the time, while just sitting here "dealing with it" works the other half of the time.
I rent my cable modem from Comcast, and I believe it is the Terayon TJ715. I went to the Apple Store San Francisco and had my base station replaced, thinking it was the culprit, but alas, the problem is continuing, only less frequently.
I've replaced all my ethernet cables, tried it with my AirPort Express (which works more often, yet has the same problem occasionally), yet my connection uptime and signal still drops to 2 bars and essentially disconnects.
Even stranger, the computer I have connected to the LAN port seems to work fine even when the computers connecting wirelessly are having issues.
I'm going down to a Comcast Support Center on Friday to (hopefully) replace my modem with a newer model (someone told me that older Comcast modems "kill" AirPort Base Stations), but other than that, any ideas? Anyone have this type of issue with Comcast in the past?
The 3 machines im running are:
Dual-Core 2.3Ghz Power Mac G5 via AirPort
867MHz PowerBook G4 (Titanium) via AirPort
800MHz iMac G4 (Flat-Panel) via Ethernet
Thanks,
Alexis
Dual-Core 2.3GHz Power Mac G5 Mac OS X (10.4.3)

Don,
Thank you for the link. However, it did not seem to solve my issue.
It's not that I haven't been able to connect to the internet at all using wireless. I will be connected fine (all 3 computers connecting to the internet simultaniously) when suddenly, any machine connected via AirPort (specifically my Dual-Core Power Mac G5) will receive two bars of signal and will no longer connect to the internet. The only remedy I've found is to reset both the cable modem and AirPort Extreme Base Station, and this only works about 50% of the time.
I am going to have Comcast replace the modem (and in the meantime, get new Ethernet cables) tomorrow, so hopefully I won't be having this issue anymore, but I'm more curious what may be causing the issue. Have you heard anything about older Comcast modems causing latency issues with AirPort Extreme Base Stations?
Thanks again,
Alexis

How do I set up a wireless network with an AirPort Extreme base station and two airport extreme but between apple devices either by ethernet

How do I set up a wireless network with an AirPort Extreme base station and two airport extreme but between apple devices either by ethernet

This Apple support document provides good general information on configuring different types of neworks using multiple AirPort routers.
http://support.apple.com/kb/HT4145
In particular, you would want to focus on the information regarding a "Roaming Network"

Define static IP for both LAN and W-LAN devices with an Airport Extreme Base Station

Hey guys,
I have a lot of different devices connected to my Airport Extreme Base Station (5th Gen) either wirelessly or via ethernet cable. Since I control some of them via VNC and currently have to find the corresponding IP-addresses through trial-and-error, I'd like to define static IP-addresses for the computers in question. My network consists of a cable modem connected to a TP-Link WR1043ND router in the basement, from which an ethernet cable leads to the WAN-port of the aforementioned Airport Extreme Base Station on the 2nd floor. Two of the devices I want to remote-access are wired to a D-Link DES-1005D switch, which in turn is connected to the 1st ethernet port of the Airport Base Station. The remaining 3 remote clients are connected over 802.11n. All computers run Windows.
My problem now is that even though I was able to define static IP-addresses employing the "DHCP only" router mode, this didn't seem to work for the two computers connected via ethernet. Not only did I lose any internet connectivity with those, I even lost the ability to remote-connect to them using the VNC-viewer.
The question now is: how do I specify static IP-addresses for my ethernet devices correctly?
I hope you can help me.

My network consists of a cable modem connected to a TP-Link WR1043ND router in the basement, from which an ethernet cable leads to the WAN-port of the aforementioned Airport Extreme Base Station on the 2nd floor.
If you read the information in the other post, my answer would be the same here.
The Router Mode of DHCP Only is rarely used, and would only really be appropriate if your ISP was providing you with a fixed bank of multiple fixed or static IP addresses to use. This does not appear to be the case in your post.
If this were the case, the first IP address would be used as a Static IP address for your connection, and other devices on your network would receive the other fixed IP addresses.
99%+ of the time, you would use the Router Mode setting of DHCP and NAT on a network when you want the AirPort to perform as the main router for the network.
But......your post also indicates that you have another router upstream on your network from the AirPort Extreme. You would not want to run two routers in series on a network. That explains the problems that you are having.
The AirPort Extreme needs to be configured in Bridge Mode. It cannot be the "main" router on your network when you already have another router on the network. That is a fundamental networking rule.

Configure protocol with airport extreme base station

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