Slow DNS in WDS Networks

I have 3 airport base stations (one extreme and two express). My extreme is connected to my cable modem and shares the conenction via WDS with the other two base stations. I have an odd problem. For some reason the DNS server addresses are not being distributed by the extreme base station. It is using its own address (192.168.1.1) as the DNS server address and then seems to be forwarding requests. The problem this causes is that most DNS requests time out. If I manually configure the DNS server addressses to be the addresses given to the base station by Adelphia then it works fine, lookups are almost instant, as they should be.
Am I missing something in the config to make airport behave correctly, is there any way to convince the main base station not to try and be a DNS server on its own?
Thanks,
Ian

Why is your Airport Base Station distributing IP addresses on the 192.168.1.x subnet? Did you alter the configuration of the Base Station from the default 10.0.1.x, or are you using a separate router that is providing IP addresses on the 192.168.1.x subnet?

Similar Messages

Unbearably slow Internet connection using WDS network

We have an old Airport Extreme (saucer, 802.11b/g) and an Airport Express (802.11n, b/g compatible). We're using the Extreme as a WDS main, and the Express as WDS relay. Wireless devices that connect to the Internet in our house include a MacBook Pro, a couple of iPhones, an iPod Touch, an XBox 360, and a PS3.
None of these wireless devices are in direct line of sight to the main base station. Typically, our connection to the Internet is decent for the XBox, which has almost a clear line of sight to the relay (Express) base station. On the other hand, the connection for the MacBook Pro, iPhones, and iPod, is extremely slow. Maybe the actual connection speeds are the same for all devices, but at least for the XBox online gaming works. (Haven't tried online gaming with the PS3 yet.)
The problem that compelled me to post this thread is the slow Internet connection to our MacBook. When our MacBook Pro is moved from its usual location to a place just a few feet away from the Extreme, download speeds are satisfactory (e.g. 10,000+ kbps measured using Speakeasy.net). However, when we sit farther away from the Extreme and are only a few feet from the Express, download speeds are dismal (200-300 kbps). The Internet connection is noticeably slow; web pages load like molasses, and watching streaming video is almost impossible. Upload speeds are usually about 7-10x faster, which is kind of strange.
Airtunes is off. We've tried setting up the Express base station as a WDS remote instead of relay, no difference. Allow wireless clients is turned on for both main and relay. Channel 1, WPA2 personal security.
Part of the problem may be due to the fact that our house is steel framed so, depending on location, the frame of the house may get in the way of our wireless network. But even if the MacBook is within 2 feet of the Express with NO walls or obstacles in between, the speed remains dismal. The line of sight from the Extreme (main) to the Express (relay) is impeded by a few obstacles but little in the way of walls.
However, if the MacBook is close to the Extreme, with good speeds, then I walk away and sit near the Express, I still get good download speeds. This lasts only a short time. Also, if I turn off Airport on my MacBook Pro and turn it back on again, speeds are back down right away.
I understand WDS cuts the bandwidth down substantially, so I decided to unplug the Express and just use the Extreme station, set to create a wireless network instead of participate as main in a WDS network. When I do this I get satisfactory speeds on the MacBook Pro, even sitting at a location where I used to get the slow speeds.
So at first I thought forgetting about WDS completely would seem to be the solution to the problem. That seems to be true for the MacBook, but when the Express is offline and the Extreme is the only base station, the XBox and PS3 now are the devices with a very poor connection to the Internet, as there are 3+ steel framed walls between the base station and the devices. When the WDS network is up, the XBox and PS3 are almost in direct line of sight to the relay station (but then I lose speed on the MacBook and other devices.)
I'm trying to find a solution that allows a good speed connection for all these devices. Right now I have to choose between a regular network with a good connection for my MacBook, or a WDS network that allows gaming but appears to be worthless for the MacBook.
Your assistance is most welcome.

I'm trying to find a solution that allows a good speed connection for all these devices.
The solution is to run an Ethernet cable from the LAN port on the AirPort Extreme base station (AEBS) to the AirPort Express (AX). Then you won't need to use WDS and you won't suffer the bandwidth penalty of WDS. Then you would configure both the AEBS and AX to create a wireless network using the same SSID (network name) and wireless encryption type/level/password. The AX should be configured to act as a bridge (not sharing a single IP address).

Can I Use 802.11n Base Station and 802.11n AirPort Express in an 802.11 ac Time Capsule Main Base Station WDS Network?

I havea "wirelessly challenged" 2-story home and need to extend the range. Currently I have an 802.11n Main Base Station with an 802.11n Airport Express Remote. It's not getting the job done (upstairs connection is weak).
I am considering getting an 802.11ac Airport Time Capsule to help, even though I currently only have devices with 802.11n wireless connectivity (future-proof a little).
I an planning on setting up a Wireless Distribution System (WDS) Network:
1.) Setting up the Time Capsule as the Main Base Station connected to a Cable modem
2.) Reconfiguring and Setting up the current AirPort Extreme 802.11n as a Relay Base Station
3.) Reconfiguring and Setting up the current AirPort Express 802.11n as a Remote Station
I cannot "hard wire" one Base Statio to the other.
Will this work?

Will this work?
Unfortunately, no. WDS is a older, very inefficient way to extend the wireless network signal.
As such, newer operating systems like Lion, Mountain Lion and Mavericks do not even offer settings for this older WDS type of network.
In addition, the new Time Capsule has no capabilities to use WDS settings at all, even if you used a Mac with another operating system to try to set things up.
Even if it were possible to set up a WDS network, the speed on the network would be incredibly slow. As you know, WDS only operates at "g" wireless speed levels. Each "relay" or "remote" that you add to the network each cuts that bandwidth or speed in half.
With a WDS "main", "relay" and "remote", the network would be operating at about 14 Mbps......a tiny fraction of what the devices would be capable of providing normally.

For anyone who is experiencing slow DNS lookups...

I finally worked out what was wrong with my network config last night and thought I'd share it with everyone in a simgle post in the hope it'll help someone else.
I tried the BIND work around, but it wasn't all that much faster.
I tried disabling IPv6, but that didn't do much...
The solution?
In 'System Preferences' -> 'Network'
Go to configure the adaptor (Airport / Ethernet / etc)
In 'DNS Servers' where you'd normally specify the DNS servers given to you by your ISP... don't do this! As crazy as it sounds don't
Of course, if you're using newer routers you'd not be having this slow DNS lookup problem and specifying the ISPs DNS Servers would be appropriate... still
What you want to specify here is your ROUTER's IP:
eg. 192.168.0.1
With this simple modifcation you'll be fine. Why? You ask?
In Linux / OSX (I imagine in Unix as well) the way the lookups are carried out are different from Windows. I have other Windows computers on our network and they never had DNS lookup problems and they've been given the ISPs DNS IPs... anyway I think I'm talking out of my depth now heh.
This works!
Remember: Specify your router as the DNS Server!

I've had this problem on a G4 PowerMac running Panther, and it still had it after a Tiger upgrade. I just replaced it with a Core Duo MacMini, 10.4.7, same problem of slow DNS lookups (i.e., slow initial start to loading a web page, then it goes quickly). Windows machines on the same subnet have no such problem. I've tried the various suggestions on various forums, none of which worked. I tried:
- turn off IPv6 (no help)
- directly enter my ISPs DNS servers (no help)
- manually configure both IP and DNS (no help, went back to DHCP)
- swear at the computer (a little help, mentally)
After some more reading, I tried resolving some addresses using the host command from the Terminal:
host -v www.apple.com 24.34.240.9
where the IP address is one of the DNS servers for my ISP (Comcast). I got a no server found message! I then tried the second DNS server in the Comcast list (found from my router), also no server found. Tried the third one in Comcast's list of DNS servers, and it worked. Entered it in System Preferences -> Network as a DNS server, and now web browsing is zippy! I verified that the two DNS servers that MacOS couldn't see are also down as far as Windows was concerned (using the nslookup command in windows).
What this tells me is that the OS X algorithm for handling unreachable or slow DNS servers is different from that in Windows. Maybe Windows remembers a bad experience with a DNS server and uses ones that it has success with, while OS X just keeps trying them in order, slowing timing them out until it finds one that works?
This could also explain many of the puzzling symptoms people have been seeing (things work some times, other times not; some people have luck specifying the DNS server manually, others don't). It all depends on what DNS servers got distributed to the Mac via DHCP, and how far down the list you have to go to find one that is responsive.
Anyone reading this forum with technical knowledge of both UNIX and Windows DNS lookup implementations? Is there some way to tweak in MacOS to make it perform more like Windows in this situation (like, maybe shortening the DNS server failure timeout)?

Trouble setting up a WDS network

I am trying to setup a WDS network with two AirPort Extreme N devices. The first is hardlined and in the basement setup as WDS Main. The second is on the 3rd floor and entirely wireless with the exception of a printer connected to it and is setup as WDS Remote. The network works, but any apple machines take sometimes up to minutes to load web pages, while Windows machines load them instantly. I have run speed and ping test from both types of machine, and the numbers are good from both. Any ideas as to why the apple machines connect so slow?

Please see my response to your other post.
You do not want to use WDS for this as it will cut your network bandwidth by 50%. Instead, use Apple's "extend a wireless network" feature. This will provide much better performance than a WDS arrangement.

Can I set up a WDS network with two main base stations?

I have an AEBS in the main part of the house and a time capsule in the office in the back of the house, currently with one internet connection (it's cable modem) into to the AEBS. I have tried to use relays (two airport expresses) in a WDS to have the internet connection reach the time capsule, but unfortunately the distance is too great and it won't make it.
I can move the internet connection and AEBS into the middle of the house and everything would be fine (one internet connection into the house, no need for relays to reach the time capsule), but this requires rewiring the cable connection and adding a power outlet, which seems like a lot of work.
My other option is to simply have another internet connection hardwired into the office. This would be using the same cable that comes into the house and is split outside. If I go this route--my question is--can I get the time capsule and the AEBS be on the same WDS network (same name, same passwords?), or will I have two separate networks in the house? If it is the former--how do I set it up? Can I have a WDS with two main base stations? Or is there an easier route?
Thanks the help and advice...

My other option is to simply have another internet connection hardwired into the office. This would be using the same cable that comes into the house and is split outside. If I go this route--my question is--can I get the time capsule and the AEBS be on the same WDS network (same name, same passwords?), or will I have two separate networks in the house? If it is the former--how do I set it up? Can I have a WDS with two main base stations? Or is there an easier route?
Just run the Ethernet cable from one of the LAN ports on the AEBS to the WAN port on the Time Capsule. Configure the Time Capsule to operate as a bridge.
You do not use WDS when they are wired together.
Then configure the AEBS and Time Capsule to use the same SSID, wireless encryption type/level/password. Have them operate on different channels as far apart as possible.

Airport WDS Network and the 5GHz Option

Setting up any Airport base station with basic settings is simple but there always seem to be options that are not well covered in the 'manual' when setting up slightly more complex networks. I'm hoping someone can provide some clarification on our configuration or parhaps some advice.
For many years we have used a series of generations of Aiport basestations to create a WDS (wireless distributed) network. This is where one base station is the master and other base stations extend the range of the network wirelessly. This is not a set of wireless basestations creating an extended network by sitting on an ethernet backbone - that's a different configuration.
Anyway, we now have a Time Capsule, an Airport Extreme, and an Airport Express. The Time Capsule is the master and the other two base stations extend the network. By default, the basestations select the channel automatically but we have selected manual channels because we have neightbours that all seem to want to sit on channel 1. We've opted for channel 13, a less used channel.
[Internet ADSL Modem]
|
[Airport Extreme] ---- [Time Capsule] ---- [Airport Express]
The Extreme and the Express both operate in Bridge Mode only, that is, they simply extend the configuration of the master basestation and do not ditribute private addresses or do any NAT. I reckon this keeps it simple. Any changes made on the Time Capsule - such as Access Control changes - are pushed out to the other two stations automatically. This seems to be a significant improvement over version 5 of the airport software.
My main question relates to the 5GHz network option. I can turn on a 5GHz discrete network on the Time Capsule. It receives a unique name so it's clearly distinguished from the 2.4GHz network when connecting to it on our Macs. You would expect the other two base stations to be able to extend the 5GHz network too but their 5GHz options remain turned off by default. I can turn them on manually but I'm not sure if they should all be configured to work on the same channel or even if turning them on at all is a good idea.
Over the years, the setup of a WDS network has become easier (if only for the reason that Apple has removed some of the more confusing options and simply enables them in background). But the 5GHz network configuration is far from clear. Any advice anyone might have would be much appreciated. Thanks.

My main question relates to the 5GHz network option. I can turn on a 5GHz discrete network on the Time Capsule. It receives a unique name so it's clearly distinguished from the 2.4GHz network when connecting to it on our Macs. You would expect the other two base stations to be able to extend the 5GHz network too but their 5GHz options remain turned off by default.
It appears as if your Time Capsule is a simultaneous dual band version which produces both a a 2.4 GHz and 5 GHz network.....and you have enabled the option to assign a separate name to the 5 GHz network.
If both your AirPort Extreme and AirPort Express are also simultaneous dual band versions, they can extend both the 2.4 GHz and 5 Ghz signals from the Time Capsule.......but only if the Time Capsule is configured to use the same wireless network name for both bands.
The simultaneous dual band version of the AirPort Express is easy to identify......it looks like a miniature AirPort Extreme. Check the Model No on the bottom of the AirPort Extreme and report back with that to find out if your AirPort is simultaneous dual band.
Earlier versions of the AirPort Extreme could produce a 5 GHz or 2.4 GHz network, but not both at the same time.
Once we have clarification on your AirPort Extreme and AirPort Express, we can decide on the options that will be available to you as far as "extending" both bands.

Upgrade to 7.5.2 broke WDS network

For the past 6 months I have used a Time Capsule and 2 Airport Express to configure a WDS network. The TC is the Main station and then I have one AE as a relay and one as a remote station. It has worked perfectly fine until I was prompted to upgrade.
For what I can tell, both the TC and the Relay are now running on the firmware 7.5.2 but the Relay is no longer working. It no longer shows up in the Airport Utility and if I reset it and reconfigure it, the update ends up with the cryptic message "An error occurred while reading the configuration. Make sure your AirPort wireless device is plugged in and in range of your computer or connected via Ethernet and try again. (-6753)"
I'm not sure what to do at this point. I tried to revert to the previous firmware but that didn't work either, I'm getting a similar error... Has anybody run into the same issue or has a suggestion on what to do to get it back working again?
Thanks

I came across the same issue.
I have a simple set up: just have two AE, one main and the other relay. (I used to have four AEs previously, but got rid of those when N version came out, though configured them as WDS in case I needed to add an extra)
Anyways, I read on another thread that one should update firmware to 7.5.2 of all relay(s) and remote(s) first, before updating the main station's firmware.
Not sure if that's true, but if it is, it's a real shame AU doesn't just stop you from screwing it up, as it knows which base is doing what in the WDS you've set up.
So.. I had just updated the main, and upon updating the relay, AU failed to "see it" appear again - never came back from reboot. And from that point onwards my WDS was dead.
I tried a full reset, reconfigured everything from scratch, both AEs now being in 7.5.2, but WDS would refuse to work - checked the log file and found the main station complaining with the following line over and over (ie. kept on associating/disassociating):
Dec 28 19:49:30 Severity:5 Deauthenticating with station XX:XX:XX:XX:XX:XX (reserved 2).
So, after checking other threads, and googling some more, I just gave up (for now) and put the main AE as Wifi network creator, and the other AE set to join&extend the network.
I really wish the team @ Apple could make some improvements on WDS... or check if something's wrong with latest firmware. I mean, it could be me goofing up somewhere, but I reset both boxes 3 times (ie. redid the whole steps for WDS creation from scratch thrice..) and I've set up WDS before — until this last "rogue" 7.5.2 update came along, it was working perfectly.. kinda wish I didn't update sometimes
Anyways, for now I'm staying away from WDS, cuz for me it's broken

Solution for Poor signal in a wireless WDS network with two Airport Extreme

I have just bought my second Airport Extreme to create a wireless network with the best possible signal. I have one Airport Extreme in my office and the second one (supposedly the remote base) in the living room, two brick walls and 7 meters away. I have follow Apple instructions for the setup, main base "Create a Wifi Network" and Extend network option selected. The remote "join an existent network" and Allow wifi clients selected. According to Apple this is a WDS network between two Airport Extreme.
The network is working and the signal from my iMac is very good in my Office. In the living room the signal with my PC laptop is also very good.
Problem is that my iPod Touch OS 3.0 (I use it as a remote control in my living room with a twonky media server) gets now a very weak wifi signal in my living room, in many cases I lose the wifi sgnal although I sit two meters away from the remote Airport Extreme in the Living Room. If I go to my office with the iPod, then I get a good signal.
I think that only the first Airport Extreme in my Office (Main Base) is emitting a wifi signal and the second Airport Extreme (remote) is only receiving the wifi signal not making a repetition of the wifi signal. (Sorry for my explanation, I am not technical on this.)
I thought that, in a WDS configuration, the remote Airport Extreme WAS suppose to also replicate the wifi signal in my living room.
I have also tried a WDS manual setup with the two airport with the same results.
Is there a solution for this?. Do I have to connect the two Airport Extreme with a wire ethernet in order to be able to have a wifi signal strong enough in my living room for my iPod Touch?.
Thank you for your time.

Thank you Bob for your time.
I understand from your words that with a DHCP reservation I can force de Airport Extreme Main Base to assign an specific IP to a particular client in the network. Is that correct?. If that is the case, I will reserve the 10.0.1.3 to the Twonky Media Server (I need this to be fixed to this IP) and I will change the configuration of the remote Airport Extreme to DHCP automatic.
I will give it a try in a few days. I have spent so many hours with this set up that I am a bit terrified to start again today, to tired from work.
Just one last question. Setting up the remote Airport was very difficult with the Airport Utility. I had to reset and start many times as I always got two errors in the set up:
1.- Internet not connected.
After a minute or so, most of the time the problem was corrected automatically as the remote found the main base that is connected to the internet. I got a confirmation message for this.
2.- Second problem was that Airport Utility said that it could no connect the remote to the specified network. Sometimes (not always) the remote light turn green both in the Airport Extreme and in the Airport Utility, BUT I never got confirmation of a successful installation. Nevertheless, the connection was established because the wifi network exist.
Do I have to "disable the WAN port" during the installation of the remote Airport to avoid the problems?.
Best Regards,
Fernando

WDS Network setup Issues

I'm trying to setup a WDS Network with two APEBS's. One is in a small bedroom with the cable modem (no choice as to it's placement) and the other is in my office, with all of my printers connected. I've done hard resets on all stations. I setup the Main AEBS, WDS enabled with the Remote AEBS ID entered. Then I setup the remote base station, entering the same network name/password, enabling WDS and entering the ID for the Main station.
Upon updating the Remote station, the Main station disappears from the Airport Utility. The only way I can get it to come back is to unplug the Remote station, and turn off/on Airport capabilities.
I simply cannot have both setup and functioning at the same time. I've tried it with and without network security, double-checking every setting meticulously. I've successfully set this up before and after six hours of fighting this I'm at a total loss.
HELP!

Put both Base Stations, and the Mac you are using to run the configuration, in the same room - preferably the room with the Base Station connected to the cable modem. Don't try to take a shortcut by not doing this. This way you eliminate any chance of wireless communications problems messing with the process. You can move the remote base station anywhere you want after you are done - its configuration settings will be retained even if you have to unplug it from power.
Do a hard reset of the Base Station that is going to be the remote, to get it back into its default configuration state.
Run the Airport Utility, and rather than trying to set everything up manually as you are doing now, let the Airport Utility guide you through the process of configuring the second base station as a remote base station that "extends" the wireless network of the main base station. Letting the Airport Utility take care of the setup shouldn't take you more than a few minutes.

Unix command in ARD to remove DNS Servers from Network prefs?

I need to know how to send a unix command to remove DNS Servers in Network preferences. I need the DNS Servers field to be blank. Can this be done?

Our network administrator is getting ready to change the IP address of our DNS server. This means I have over 30 Macs that will be needing changes to their DNS settings. Since each machine is setup with limited access to the system prefs, that means I have to go to each machine and log in as the admin user to make this change. In the interest of saving time, is this something I can do with Remote Desktop and how? Would I use the same commands in this post and replace dns1 with our DNS' new IP address? Will this distrupt the users access to the network when I do so?
Thanks for any help.
Beth

Mixed security settings on WDS network

I posted this under the 802.11n topic; many views but no responses. I apologize if dual posting is bad form, but I really would like to get some help with this issue.
I have a wireless network consisting of an Airport Extreme N and three Airport Expresses, one of which is N-capable. They are set up as a WDS network with the Extreme as the main, the Express N as a relay and the two other Expresses as remotes. One of the remotes is linked to the main, the other accesses the network through the Express N relay.
My question: How do I set up security so that a device which only supports WEP can access the network while other devices, including my laptop and my wife's desktop Mac Pro can use WPA2? The Extreme and the Express N use WEP Transitional, while the other two Expresses use either WPA2 or WEP.

See the reply on the AX 802.11n forum.

Connecting to specific routers within a WDS network

I have two routers that are successfully operating on a WDS network.
The primary router is a linksys WRT54G v2.2 with dd-wrt firmware and the secondary router is an airport express. The express has my xbox connected to it allowing me to connect to the network and i have it configured to play videos from my macbook and desktop pc.
I know that because the primary router is not the airport extreme that the WAN connection is bottlenecked by the ISP, however i would like to be able to stream HD video - as well as transfer large files between my xbox, pc, and macbook - while utilizing the 802.11n functionality of the airport extreme.
Is it possible to force my macbook to selectively connect to the airport extreme in order to acheive the higher data transfer rates while bypassing the linksys router?

+I've concluded that the firmware in the newer version of the AX must ave been enhanced to permit the use of the ethernet port when it's extending a network.+
The AirPort Express 802.11n has a feature called ProxySTA which allows the ethernet port to be enabled when the device "joins" virtually any wireless network. The Express does not "extend" the wireless network when it "joins"
The 802.11n AirPort Express also works in conjunction with another Apple "n" router to allow the wireless network to be extended without the speed loss and bandwidth drop associated with WDS. The "extend" feature only works among Apple devices on a network.
When the Express is setup to "extend a wireless network", the ethernet port is also active.

Airport Extreme WDS network setup

I'm new to Apple stuff. I have a Dell Desktop running XP and a Dell laptop and IBM laptop running the same. I tried setting up a WDS network, I have an Extreme and 3 Expresses to connect to my receivers, Slingbox, etc. My desktop gets internet through the Extreme using an Ethernet cable, and we can see the network on our laptops, but when it tries to connect it gives us the "limited or no connectivity" issue. We've connected to it before wirelessly and had it work, but very rarely. Also, in the Airport Utility, it does not seem to pick up any of the Expresses even though I added their Airport IDs to the WDS network. Please help, I've definitely hit a dead end on this one. Thanks.

Time Capsule, 1TB. (0x168C, 0x9A) 80211n
Apple Express (I can't find the model number!! Though I know it is "newer" than my Time Capsule Extreme.
Both using 7.6.4
Three Apple TV's.
Sonos Music system setup in the house...separate network.
Internet service provided by ARRIS modem...from Comcast.
My goal? To have the fastest and most stable system in my house. To take advantage of the Airport Express for extending my network, physically.
Thanks!

Problems with getting WDS network to work - TimeCapsule + AirportExtreme

Hi There, Apologies if this has been answered somewhere else but I have searched and still havent managed to solve my problem.
I have a TC plugged into our cable modem which is broadcasting wirelessly fine. What I am trying to do is extend the network by using a Airport Extreme BaseStation in another room which has a PC computer plugged into the Airport Extreme via ethernet cable that (the PC doesn't have wireless capability).
so this is what I am trying to do:
Internet - (ethernet) - TimeCapsule - (wifi) - Airport Extreme - (ethernet) - PC
The Time Capsule is running version 7.4.2 software
The Airport Extreme is running version 5.7
What I have tried so far is to set the TC to "Participate in a WDS network" on channel 1 using WPA/WPA2 Personal passwords. In the WDS settings it is set to WDS main and I have allowed the Airport ID of the AE.
In the settings on the AEI have the wireless network name set to the same as the TC, I have the radio mode on 802.11g only (i have tried the others too but didn't seem to work). The wireless mode is set to Participate in WDS network, channel set to 1 and under WDS settings I have it set as WDS relay and the ID of the TC in WDS main settings.
The TC when i look at its set up occasionaly flashes up WDS error, all it says is The device is set up as WDS network but no other Apple Wireless devices were found.
Im really scratching my head on this one, Im not an expert on networks at all but normally configuring apple stuff has caused a lot less headaches that this.
Can anyone tell me if I am doing anything obviously wrong or any suggestions as to what I can do to get this working. (I personally blame the PC for not having wireless!!!)
Cheers
D

Welcome to the discussion area!
WDS can be tricky. Instead of setting up the second device as a relay, you might try setting it up as a remote. Normally, a relay is used between a base and a remote. Take a look at the excellent instructions previously posted by expert Tesserax as follows:
http://discussions.apple.com/thread.jspa?threadID=2355832&tstart=0
And you could also refer to Apple's instructions on pages 42-44 in the Designing AirPort Networks Guide

Slow DNS in WDS Networks

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