Help in creating a small network

I just bought a TC and I want to make a small network with two Airport Express boxes that I already had. Right now the TC is connected and working, but I have also connected the two AE but I can not make them show in Airport utility, when
I reset one of the AE it shows in Airport utility but I can not make any changes.
I have TC set to "Create a wireless network", is this correct? I want to extend my network, can someone please guide me step my step, I am illiterate about Networks
Thank you

Ok, since you will be using a mix of 802.11n & 802.11g base stations, your only option will be to create a WDS to wirelessly extend the range of your TC.
Here are the basic steps to set it up:
(Note: To facilitate the WDS set up, place the base stations within near proximity of each other during the set up phase, and then relocate them to their desired locations when complete. Also, jot down the AirPort IDs for each of the base stations to be used in the WDS.)
o Perform a "hard" reset on the Time Capsule (TC) and a "factory default" reset on the 802.11b/g AirPort Express Base Stations (AX).
Main Base Station Setup - TC
o Click the AirPort status menu in the menu bar and choose the wireless network created by the TC.
o Open AirPort Utility.
o Select the TC, and then, choose Manual Setup from the Base
Station menu.
o Click Wireless in the toolbar, and then choose “Participate in a WDS network” from the Wireless Mode pop-up menu.
o Click WDS and then choose “WDS main” from the WDS Mode pop-up menu.
o Select the “Allow wireless clients” checkbox if you want client computer to connect to this base station.
o Click the Add "+" button and enter the AirPort ID of the AX.
o Click Update to send the new settings to the base stations in the WDS.
Remote Base Station Setup - AX #1
o Click the AirPort status menu in the menu bar and choose the wireless network created by the AX #1.
o Open AirPort Utility.
o Select the AX, and then, choose Manual Setup from the Base Station menu.
o Click AirPort in the toolbar and click Wireless. Choose “Participate in a WDS network” from the Wireless Mode pop-up menu, and choose the same channel as the main base station from the Channel pop-up menu.
o Click WDS and choose “WDS remote” from the pop-up menu.
o Enter the AirPort ID of the main base station in the WDS Main field.
o Click Update to transfer the settings to the base station.
Relay Base Station Setup - AX #2
o Click the AirPort status menu in the menu bar to join the wireless network created by AX #2.
o Open AirPort Utility.
o Select AX #2, and then, choose Manual Setup from the Base Station menu.
o Click AirPort in the toolbar and click Wireless. Choose “Participate in a WDS network” from the Wireless Mode pop-up menu, and choose the same channel as the TC from the Channel pop-up menu.
o Click WDS and choose “WDS relay” from the WDS Mode pop-up menu.
o Enter the AirPort ID of the TC in the Main AirPort ID field.
o Click the Add "+" button and enter the AirPort ID of AX #1.
o Click Update to transfer the new WDS settings to the relay and remote base stations.
(ref: Pages 42-46 of "Designing AirPort Networks.)

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NEED HELP TO SET UP SMALL NETWORK - WIRELESS SIGNAL FROM NOVATEL U760 USB

Hello -
I need help setting up a small network in my new home in Florida, which has no wired broadband capability - not cable, not dsl. My options are satellite (which I'd like to avoid) or wireless broadband via Millenicom (or now Virgin Mobile) using their Novatel U760 USB stick.
Here are the network components - someone please tell me how to set this up:
PC #1 (has wireless card, but I've connected it by ethernet to the router)
PC #2 (no wireless card; connected via ethernet to router)
MACBOOK, 1 1/2 years old (2.1 GHz Intel Core 2 Duo, 4 gigs RAM), running OS 10.58, connected wirelessly to router.
AIRPORT EXTREME BASE STATION, Model A1143.
I'm not thrilled about using a wireless 3G signal as my primary one, (sprint network, claims 600 - 1400 kbps speed), but it costs 1/2 to 1/3 of what a slightly faster satellite signal would.
I have not ordered this service yet. Before I do, I'd like a clear understanding that I can, in fact, set up my simple network, which I'd probably do the same as it's now configured with cable broadband - both PC's plug via
ethernet into the Airport Extreme router, the MacBook connects wirelessly - AND,
my question is this:
Can I plug the wireless card - a Novatel U760 USB-stick device - straight into that USB slot in the Airport Extreme base station and will it automatically recognize that device?
Or, do I have to plug it into the MacBook and somehow share that wireless signal between the 2 PC's (only 1 of which has a wireless card, so I'd have to get a card for PC #2)?
And help anyone can provide will be much appreciated!
Thanks,
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from the Airport FAQ #14:
"Question: Can I connect my Soundsticks or other USB speakers to AirPort Express?
Answer: No. The USB port is for connecting a printer, not for other devices."
Im assuming other devices include USB modems.
So, I would say your cheaper route would be to get a second wireless card and just share your internet connection from one of your PC.

Creating a small network

Helo I have recently aquired a static IP address from my ISP.. We have about 4 other macs and 1 PC on the network. My vision was to ultimately connect to a particular computer from home using remote access but my knowledge of this is quite limited.
I have assigned the new static IP address to my Netgear router but I am unsure how the computers on my network should now be configured. Should I assign new IP addresses to each computer based on the new number range from the static IP provided from ISP. Any help on this or any links to useful information would be very much appreciated.
Regards Ian

Go here -> http://www.whatismyip.com/
and this will show you the IP address of the computer you are using.

Small network redesign help

Hello,
I work in a small company that has about 75 clients, and about 10 servers, and I have a refurb 4948 that's not setup yet, currently on the live network are asa5510, a sg300, voip system, and an old 2960 that's currently my core sw (the 4948 will replace this) and I'm planning on redesigning our flat network.
We've always had a single collision domain on vlan 1 which I read is not recommended for security, and I was wondering if it's worth the headaches of setting up vlans on this small network (I'm no Cisco veteran, just learned hands on reading forums and guides) So my plan is to finally set up a dmz on the firewall and I'm reading a bit more before I get into that, and put the servers in a vlan on that dmz, I read that the 4948 can do routing so I can probably set inter-vlan on it if needed. Here's a diagram of my planned network, if you guys can give me some guidance on a best way to redesign it I'd totally appreciate it. Thanks in advanced.

Why do you want the servers in a DMZ, are they going to be accessed from the internet ?
I would definitely recommend putting the servers on the 4948 switch has it has much better performance than the 2960. And as you say it can route as well so perhaps it might be an idea to replace the 2960 with the 4948 and then if you do need a DMZ use the 2960 as the DMZ switch.
Ideally you do not want your DMZ switch to have any internal LAN clients on it but that may not be possible for as you may not have enough ports. But you definitely do not want your DMZ switch to be routing, that should be left to the firewall.
In terms of using vlans the answer is it depends. With the number of devices you have it may not be worth doing unless you are experiencing issues at the moment. It is always a good idea to have the servers on a separate vlan because if they are the same vlan a faulty NIC in a client could bring down the servers as well but that said in your setup all the clients would be in the same vlan anyway. And generally people start to consider using vlans when the IP subnet gets to be bigger than a /24 which you are nowhere near.
I presume at the moment you route off the firewall ie. the inside interface of the firewall is the default gateway for the clients and servers ? If you stay with one vlan there is no benefit to routing on the 4948, you may as well just use this as a higher performance switch for the servers/clients.
I can't see a need for vlans here unless you are experiencing performance issues but the 4948 could well sort that out for you.
Perhaps you could clarify the bit about the servers and the DMZ and maybe go a bit more into what you want ?
Jon

Help, I cannot connect to the internet via airport with either my Imac or I-Pad. Connecting via ethernet works okay for Imac. I can connect wirelesssly with my windows laptop. I have reset my router, created a new network. It was all okay on Monday

Normally I have my IMac, I-Pad and Windows Laptop all working on my home network via wi-fi. This week I find that I cannot access the inetrnet on my IMac or I-pad via wi-fi but I can connect to the internet via wi-fi with my windows based laptop.
The airport diagnostics (reds/yellows) indcate that I am connected
I can access the internet if I plug my IMac into the router via an ethernet cable
I have restarted the IMac and the I-Pad, rebooted the router and created a new network. None of these changes has made a difference. Does anyone have any ideas please?

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HELP - Problems with Time Capsule when creating a wireless network

I am trying to change my current D-Link router for my TC (so that the TC creates the wireless network instead of the D-Link). However, when I connect the TC directly to the modem it states there is no internet connection?
Anyone have any ideas on how to resolve this?

Is the modem a router as well??
How is the dlink setup... is the modem adsl or cable?
If cable, did you reset the cable modem when you changed over. Power down and leave for 5min.. then power up again.. did the TC get the public IP on the wan interface .. use the airport utility to check.
If it fails wait longer time.. or contact cable company to reset the port.
If it is adsl modem router, or cable modem router
Bridge the TC.. go to the manual setup of airport utility, internet tab, connection sharing and select bridge.
If the dlink uses pppoe now, you can also use that setup.
We need more info... what broadband.. what modem.. what have you tried?
What is the current setup of the dlink?

Creating a simpel network with Lion Server, and add Windows XP computers to it

We have a Mac Lion Server and 3 computers with Windows XP. Previously we had a Windows 2003 server with a domain name: "MYDOMAIN". When logging into Windows it logs into this domain.
I would like to replace this Windows 2003 server with my new Mac Lion server so, I build up a test setup. I connected the Mac Lion server (iMac) with my Windows XP pc with an ethernet cable. Then, I setup a DHCP, DNS and Open directory in the Server Admin. Added users. I configured the IP adres of the server to a static one by setting the IPv4 to "using DHCP with manual address".
Then I wanted to let my Windows XP server join the domain of the Lion Server, however I cannot let my Windows XP client connect to the domain of the Lion Server.
I read in the advanced administration that you can set up Windows XP for domain login. Where do I find the name of this domain? It should be stated in the server admin, open directory, settings, general tab, but the only thing I find here is: Role: Open Directory Master.
In Windows XP, when I explore in explorer the Microsoft-Windows Network I can see in "MYDOMAIN" the MacLion Server and my Windows XP pc. So sharing files is no problem.
However, I really want to create a new domain with my Lion Server and let the Windows XP pc's login to the new domain.
I hope anyone can help me.

Thanks for the info.
I read some stuff about this indeed, so I was thinking, because we have a small network, could it be possible to share files on the server via a workgroup?
If we add the 3 Windows XP pc's to the same workgroup as the Lion Server, would there be a problem?
Then at startup of Windows XP, should we login to the pc instead of the domain? And where would I find the Lion server in Windows XP?

Creating my home network, Apple Airport Extreme & Sky

Hello all,
Hoping somebody can help, I’m attempting to set up a network in my home that works a bit like this.
Ok, we’ve had sky broadband for a few months now and have the new grey Sagem router to go with it. I also have the new Apple Airport Extreme station (and an Oldish BTHomehub v1.5, the white one… just kicking about incase its useful!)
What I want to achieve is use Time Machine on my Macbook Pro to wirelessly backup over the network to a Hard Drive plugged into the AE. I want the AE to be upstairs away from the sky router and I also want to be able to plug Ethernet devices into the AE to use the internet (somehow acquired from the router downstairs I assume) like an Xbox, laptop or anything else I might need really).
*Its important to me that the AE isn’t downstairs in the same room as the router, otherwise I would just connect it with a cable and create a wireless network from that.
On top of that (stay with me….) if the AE has the functionality to extend the wireless network further to hit the low signal spots that would help.
I’ve been reading around the internet and various support sites. I know a little about this stuff but I’m not an expert on networking, I know nothing about the different signals N, g, b etc or how IP assigning works. I read a little about WDS networking but I’m not sure which direction to head.
This is probably the closest thing I’ve found to what I’m talking about, If the bottom hub was the sky router and the top hub was the Apple AE.
http://www.jarviser.co.uk/jarviser/repeaterhubs.html
Appreciate any suggestions, thanks.

The best way by far is to run ethernet as a kind of backbone between the two stories.. on one storey setup the AE and the other you setup the TC.
I have no idea if one is the main router or not.. or both are bridged.. that doesn't really matter.. the principle is.. one router per network. So whichever is not the main router change to bridge mode.
Both should create a wireless network. You can use roaming setup, where both use identical names and identical security. See http://support.apple.com/kb/ht4260

How would you use these Apple devices to create the best network?

I have the following devices and want to create the best network for my 3 story home:
Time Capsule 3GB, latest generation (needs to be located on middle floor in a corner room by the Comcast modem)
Time Capsule late 2009
Airport Express 2010
More data, the devices that connect to this network:
New MacBook pro (in same room with new Time Capsule)
New iMac (in same room with Time Capsule)
2009 iMac (on second floor)
Iphone 5 and 5s
ipad Minis
ipad Airs
Apple TV second generation
I've done some testing and the signal is pretty good on the second floor (meaning that the download speeds on the second floor iMac are the same as those in the same room with the new Time Capsule). But the upstairs bedrooms have speeds cut by 50%.
There is no reasonable way to connect the new Time Capsule by ethernet to any other devices.
Would it be helpful to extend the wireless network "wirelessly" with the old Time Capsule in an area upstairs with strong signal? Would the old TC then "re-pump" the signal into the bedrooms which don't have line of sight with the new TC?
How would I best do this?
Thanks for any help you can offer.

Time Capsule 3GB, latest generation (needs to be located on middle floor in a corner room by the Comcast modem)
Time Capsule late 2009
Airport Express 2010
So, the old Time Capsule and AirPort Express are near the new Time Capsule and connected to it with an Ethernet cable.....or are the old Time Capsule and Express not even in use at all?
Would it be helpful to extend the wireless network "wirelessly" with the old Time Capsule in an area upstairs with strong signal?
While it would be better if you could connect the old Time Capsule to the new Time Capsule using a wired Ethernet connection, the old Time Capsule might help things out a bit in the bedroom area if it is located where it can receive a strong wireless signal from the new Time Capsule.
This is one of those situations where performance cannot be predicted and you simply have to try it out in your home to see how well it will work. It could not hurt to use the old TC to extend the signal wirelessly to the bedroom area, if you want to give that a try.
You did not mention the AirPort Express, but it could possibly be located downstairs if you need more wireless signal coverage in a given area. The trick again, is to find a location where the Express can both receive a strong wireless signal and also provide additional wireless coverage.
Setting up the old Time Capsule or Express will only take a few minutes if you want to give things a try. Post back if you need more details on "how" to do this.

Time Capsule - Can it run as DHCP router, create a wireless network and plug into switch for wired network all at the same time?

I have a closet with Wired connections from all over the house terminating in it. I also have the internet modem and a switch in this closet. My old setup was a netgear in the closet creating a wireless network and also feeding the Ethernet ports all over the house. In my room, I had an Airport express (a month old) bridging the wifi to make the wifi network larger. The Express was hard wired from the wall and my mac mini was using it's wifi (printer was plugged into other ethernet port). Everything was working great.
Fast forward to last week. My Netgear died. So, I bought a time capsule. My plan was to move the Express to the closet and have it create the wifi network and also then run cat 5 cord from express to the switch to feed all the wired wall plugs. Reset it and set it up to create the wifi network as well as DCHP NAT. Wireless was running great on it. Then I plugged in the Cat 5 in the second Ethernet Port to the switch. Wifi stopped working and none of the computers would connect using wired connections either. They would see a 'network' but nothing would work. I would unplug the Cat 5 feeding the swtich and the wireless would start working again. Plug the Cat 5 back in and wireless would stop.
So I thought I would try the Time Capsule in the closet and see if I could get it to work. Pretty much the same thing, except at this point I figured out if I went in and told it NOT to create a wifi network the wired portion worked fine and all the wired computers in the house worked fine. Of course, then I didn't have Wifi.
I'm not clueless when it comes to networking, but I can NOT figure this out! Can either the Time Capsule or Express Create the wifi network AND also feed the data to the switch for all the wired computers?
To simplify this is what I want my end result to be. I prefer the Time Capsule to be the wireless connection extender, but if I have to have the Express do it, I'm fine with that.
1. Express in the closet creating the wifi network as well as feeding the data to the wired connections via my switch.
2. have the Time capsule in my room at the opposite end of the house plugged into the hard wired connection to extend the wrieless network as well as have wired connections such as my printer and my Mac Mini.
If I can get #1 to work, I don't think I'll have any problems with #2. Help!

I have an equally complex setup with a managed switch actually but I have never seen the TC have this kind of issue.
What I do notice is you have changed the TC from defaults.. you are using a non-default IP range.
I have run across issues like this where people move things from default.
I would like you to start over.. factory reset the TC. That will set it back to default router mode.
Do the min setup on the TC..
1. Change all names from what you were using. That includes the TC name and wireless name/s
Make them short, no spaces and pure alphanumeric because that is the correct way to network. Apple default names with spaces and apostrophes are fundamentally bad.
2. With just the TC plugged into the switch.. and a single computer connected by ethernet. Power cycle the whole network.. this allows the switch to clear all the old MAC address.
3. Test on the computer just ethernet. Turn the wireless off.
The computer must use dhcp and must get an ip from the TC.
It has to get the correct Router.. ie Gateway.. I wish apple could stick with proper network terminology.
And it must get same address or valid DNS server address/es.
If it fails.. please plug ethernet directly to the TC.. bypassing the switch.
You should get the standard IP addressing and internet connection.
If not please post the screenshot from the Mac of the network preferences showing the ethernet setup.
I need to see what address it does get. I need you to make sure the ethernet is the TOP of the list. So rearrange the order of network connection. With the airport off it should just go to the top of the list.
If it appears to be working .. but a browser cannot connect, open a terminal and ping an internet address.
Ping the actual gateway address the ISP gives you and ping the ISP dns address.

How can I create a guest network on an airport extreme that connects wirelessly with a Timecapsule

I have a Timecapsule in one place of our house, that is connected to Internet. I need to extend the range of my network: 1. my private network needs to get to a remote location to make connection with speakers (Itunes). for this I need to first extend the range of my private network, because the speakers are too far away from the TC. 2. I need to set up a guest network, but at quite some distance from my TC, in an other part of the house, too far away from the TC (so a guest network on the TC won't do).
For this, upon advice from an apple store, I bought an airport extreme, which I have placed on a location where it can connect to the TC, to extend the private network. On the location of the speakers, I have an aiport express (connecting to the extreme), to play music from Itunes. The setup at this moment is: TC makes connection to internet, and broadcasts a private network. Extreme connects to this private network, and broadcasts it further to the Airport express, that captures it and plays the music. I would now like to create a guest network on the Airport Extreme, while this Extreme keeps on connecting to the private network of the TC and keeps on broadcasting it to the Express. Is this possible? How can I do this? Thanks for the help !

I would now like to create a guest network on the Airport Extreme, while this Extreme keeps on connecting to the private network of the TC and keeps on broadcasting it to the Express. Is this possible?
Unfortunately, the "main" router...your TC in this case....is the only device that can create a Guest Network, assuming that the TC is connected to a simple modem.
Unfortunately again, the Guest Network cannot be extended. Your only real option here is to create a Guest Network on the TC and hope that it will have sufficient coverage for your needs.

Can I create an extended network with a brand new TC and 2 first gen. AE units?

I purchased a TC 2TB yesterday and replaced my non apple router with the TC. I have 2 older AE units that I suspect to be first generation. TC is in basement and I have placed AE in garage where I spend most of my time. Signal in garage is weak and lags. Air tunes off of AE in garage connected to boom box works fine. I run AirTunes from 3 iPhones, iPod touch, and 2 iPads with no problems. The options in manual setup for the AE don't offer make this an extended network, I suspect because they are too old? I don't want to create a WDS network and sacrifice the bandwidth. My main machine is an iMac 27 that is one year old, this is in the kitchen pretty much midway between the TC and the AE in the garage, if that makes any difference?
Any help is greatly appreciated.

The options in manual setup for the AE don't offer make this an extended network, I suspect because they are too old?
Please take a look at the faint print on the side of both AirPort Express (AX) devices that you have to identify the Model No.
You will need # A 1264 to do what you want. If you have # A 1084 or similar, the devices that you have are not compatible with the "extend a wireless network" setup.
What are your findings?

I have a canon scanner MP560 wireless. Needed to create new wireless network and now my computer can't find the scanner/fax..

My iMac doesnt' see my Canon MP560 wi fi scanner ever since I created a wireless network in my house. Can't find a way to change whatever settings i need to to connect the scanner. help.

Well let's see if we can help you get set up. Have you got any 2.4 GHz cordless phones in the house and if so try unplugging them and do a hard reset of the express.
1. unplug the express
2. press the reset button
3. while pressing the reset button plug in the base station
4. keep holding the rest button till you see 4 green lights flash
you may have to hold it for 30 seconds or so
if this doesn't work try plugging the express in right beside the computer and then going through the airport setup assistant
Good luck
Let me know
iMac G5 iSight 17" Mac OS X (10.4.4)

I can no longer "create my own network" from the wi-fi menu (iMac 27 late 2009 OS 1.7.5)

In 10.6 I have been using the iMac to create a wi-fi network for the rest of the devices in the house. i.e. The iMac is connected physically to the modem and I don't have to spend $100 on an airport !
I just upgraded to 10.7.5 and the "create own network" option has disappeared from the wi-fi dropdown menu.
Does 10.7 no longer support this approach ? My iPhone can "see" my iMac but since I cannot create my own network I cannot make a password, and therefore cannot give a satisfactory answer to the iPhone's prompt for a password.
Any help would be appreciated, thanks
S

HI BDAqua,
This is good to know - I actually found the right way to do this after much surfing around (and then received your message) - in system preferences > Sharing one can click "wi fi options" bottom right before you toggle any share button and set a password. Why this is now here but not in the dropdown menu I don't know,
Thanks anyway for your help,
S

Can't create a wireless network without a wireless card on my Mac

Help!
O.k. I tried searching the forums for an answer but the odd nature of my problem, and the immense database of topics made it very difficult to find a similar post.
The general issue/idea:
Run a wireless network using Airport Extreme - Connect desktop mac via ethernet and Roku player via wi-fi. Can't get the desktop mac to connect via ethernet when I restart the network/Airport Extreme.
My Father in law has my old computer; It's a PowerMac G5 (Dual 1.8GHz CPUs) running OS 10.5.8), connected to internet via cable (TimeWarner) modem. It does NOT have an Airport or Airport Extreme card installed. The computer works fine, and I don't believe that I 'need' an Airport Card in order to use the Airport Extreme (it's a brand new/refurbished model) in the manner described below.
I would like to use the Airport Extreme to generate/run a wireless network (Do I need an Airport Card in order to generate/run a wireless network? Doesn't the AE actually do that?), connect the desktop Mac to the network via Ethernet (I shouldn't need an Airport Card to do that, should I?) and connect a 'Roku Player (802.11g capable) to the network via wi-fi.
As far as I know, this should be possible.
Basic steps/as I understand them:
A. Connect ethernet from cable modem to AE.
B. Connect ethernet from AE to desktop Mac.
C. Create the wireless network using desktop Mac and Airport Utility.
D. Restart AE to start the wireless network running.
E. Connect Roku to wireless network over wi-fi.
I have no problems with A & B. Once the AE is connected to the desktop Mac, I'm able to get internet via ethernet as it passes through the AE. I can then create a wireless network (step C.) using the Airport Utility (and setup assistant). The problem starts after I've configured the wireless network.
Once I've configured the wireless network, the Airport Utility software prompts me to restart the AE in order to start the wireless network.
As soon as I restart the AE, my desktop Mac tries to connect to the 'wireless' network, even though it's already connected via ethernet. I don't have a wireless card in the Mac, and I don't want to connect the desktop using wi-fi/wireless. It's connected via ethernet, works fine during configuration, and I don't ever anticipate a desire to connect the desktop via wi-fi.
No matter what I do, I can't get the desktop to connect via ethernet. The only network connection option I'm offered is 'Rescan'. O.k. the desktop can't find the wireless network (because it doesn't have a wireless card), and I'm unable to continue with the Airport Utility. I can't make any further changes to the network (the options to manually change the network configuration are not available as the desktop Mac cannot currently talk to the AE - It's still trying to connect wirelessly), and the desktop has no internet connection as it's trying to connect wirelessly.
*How can I...*
*Setup/run a wireless network, while keeping the desktop Mac connected via ethernet?*
I'm perfectly willing to factory reset the AE and start over.
Any help appreciated.
Thwarted by the network.
- Robert

My Father in law has my old computer; It's a PowerMac G5 (Dual 1.8GHz CPUs) running OS 10.5.8), connected to internet via cable (TimeWarner) modem. It does NOT have an Airport or Airport Extreme card installed. The computer works fine, and I don't believe that I 'need' an Airport Card in order to use the Airport Extreme (it's a brand new/refurbished model) in the manner described below.
That is correct, you could connect the PowerMac G5, via Ethernet, to the AirPort Extreme Base Station (AEBS) or any other wired router for Internet access. You do NOT need an AirPort Card for wired access ... ONLY if you want the G5 to connect to a wireless network.
I would like to use the Airport Extreme to generate/run a wireless network (Do I need an Airport Card in order to generate/run a wireless network? Doesn't the AE actually do that?)
That is correct, the AEBS is a wireless router that can provide a wireless network. The AirPort Card, on the other hand is a wireless adapter used to allow a Mac to connect to a wireless network, created by any wireless router ... not just those provided by Apple.
As far as I know, this should be possible.
Basic steps/as I understand them:
A. Connect ethernet from cable modem to AE.
B. Connect ethernet from AE to desktop Mac.
C. Create the wireless network using desktop Mac and Airport Utility.
D. Restart AE to start the wireless network running.
E. Connect Roku to wireless network over wi-fi.
Yes, these are all good assumptions.
As soon as I restart the AE, my desktop Mac tries to connect to the 'wireless' network, even though it's already connected via ethernet. I don't have a wireless card in the Mac, and I don't want to connect the desktop using wi-fi/wireless.
Do you actually have an AirPort Card installed in the G5 now? If so, then it might be possible that the "firing order" for network connectivity has AirPort at the top of the list under System Preferences > Network. Just change the order to have Ethernet at the top and disable AirPort to ensure that the G5 connects by Ethernet only.

Help in creating a small network

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