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Old 09-15-2003, 08:14 PM   #1
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Post DISCUSSION: Building a Slackware Wireless Access Point

This thread is to discuss the article titled: Building a Slackware Wireless Access Point
Old 09-30-2003, 01:23 PM   #2
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I used your document this weekend to setup an AP on my slackware 9 box. I commented out the encryption key so that I had an open system and was able to pick up the ESSID and connect to the AP. The problem was that I was not able to retrieve an IP address for my client system. I'll continue working on this to see if the problem is with my setup.

Few questions:

1: In your setup what range of IP Addresses are given out as DHCP addresses?

2: To change the broadcast IP range do you change the following in rc.wlan0 & rc.firewall?

# Original document had this: IPADDR=

# Add masquerading to the POSTROUTING chain in the nat table.
$IPT --table nat \
--append POSTROUTING \
--out-interface eth0 \

# here is the change ### = ### in IPADDR= in rc.wlan0
# old line was: --source \
--source 192.168.###.0/24 \
--destination 0/0 \
Old 12-17-2003, 08:04 PM   #3
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Sorry for not responding... didn't realize that there was a post in the discussion.

Currently I don't have DHCP set up for my wireless network (that's why it's in the "to do" section.) If I were to set up DHCP my range of valid host IP addresses would be to That's because I use a 24 bit network mask, which leaves the last eight bits available to create unique host addresses. One of those addresses is considered the "network" address ( One of those addresses is taken by my Linux box ( and the other is taken by the broadcast address (

I'm not sure what you mean by changing your broadcast IP range. If you're using a 24 bit network mask then your broadcast address is If you're using a different number of bits for the network portion of your address then you'll need to change your broadcast address so that all non-network bits are set.

Maybe this example will help. I'll show the binary addresses with braces around the host portion of the addresses, then I'll show the dotted quad equivalence:

Let's say that you need addresses for more than 254 hosts (.1 throught .254), so you make your network mask 23 bits instead of 24 bits. That means you can use 9 bits to create 510 distinct host addresses instead of 8 bits to create 254 distinct host addresses.

Your network address (where the host portion is all zeros) in binary will be 11000000.10101000.0000001[0.00000000] which is in dotted quad notation. Your broadcast address (where the host portion is all ones) in binary will be 11000000.10101000.0000001[1.11111111] which is in dotted quad notation. The valid hosts are 11000000.10101000.0000001[0.00000001] which is to 11000000.10101000.0000001[1.11111110] which is

It's easier just to stick with a 24 bit network mask unless you really need more addresses than that. You should consult a good TCP/IP administration book. O'reilly has a pretty good one.
Old 02-21-2004, 12:35 PM   #4
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I was interested by the need you mentionned, of adding a "modprobe" in rc.somewhere.
Maybe that's why my own adapter works when just manually installed, and not after reboot.

Last edited by zorba4; 03-05-2004 at 06:50 AM.
Old 06-04-2004, 01:04 PM   #5
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Hey guys,
Nice document there !!! I might be tempted to by a WiFi card just to try it... My question is: did you ever thought of how many clients you can hook to this access point ?? I would be interested to, mayby use your technology to offer hotspoting in my area...

Tks for any replies!

Last edited by LuggerHouse; 06-04-2004 at 01:08 PM.
Old 05-12-2005, 09:51 AM   #6
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nice document, I added that file and executed it and my card is an access point that easy, then I had 3 other cards in that box so I fired them up and gave them the network key and they all have a connection to the First card

Current specs : 4 atheros Mini PCI cards running on slack 10.1 kernal 2.4
Running Madwifi drivers

Later on I am goign to try to fire up all of those cards as separate access points and see if I actually get an internet connection with them, it apears that I would but you never know since i am not sure if I have an ip address or not.

You said its not done with DHCP so would that mean I would have to assign each client an ip address in the 192.168.1.xx range in order to reach the internet?????????????????????????

My only problem is the calling code that I added to the rc.inet1 file it calls the rc.wlan0 file on boot but says that my interface is not found, then apears to be up when I iwconfig it but nothing can connect! Its easy enough to fix though I just took the code out of rc.inet1 and just manually did a ./rc.wlan0 and all is well, its not a big deal since I dont really need the access point to go up at boot automatically but if somone has a workaround would be helpfull to post it or an explanation of why it wouldnt find my card at boot but does just fine afterwards
Old 01-10-2006, 04:11 PM   #7
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Lightbulb went to netgear

went to netgear and did a product search for the MA311 and this is what i got Did You Mean: ma111

Your search did not match any documents.

* Make sure all words are spelled correctly.
* Try using fewer words.
* Try using more general keywords.
* Try different keywords or spellings.
is there another card that will work like the ma311 from netgear?
Old 01-10-2006, 04:45 PM   #8
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I went to and looked in their product finder on the first page. The product finder is just above the product search. I clicked on the button and found the ma111. Here is the page:
Old 01-10-2006, 10:52 PM   #9
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No, that's not it. Look on Amazon .

I wrote the tutorial a couple of years ago, so I don't think that the card is in production anymore. Anything with a Prism chipset should work, I think.
Old 01-11-2006, 04:02 AM   #10
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Thumbs up

thanks for replying so quikly do you know which linksys/netgear ect ect. adapters that currently have the prism chipsets in them the reason im asking is because im looking into setting up a community based free access network in my area id prefeer using linux to do it with rather than some off the shelf ap becuase linux offers so much more plus i can pick up PI and PII for less then $25 dollers in my area then add the cost of the card + material and the price is about the same as buying a crummy off the shelf product that doesent allow you to do half of what linux with a few add ons will do
i origonaly posted in the wireless networking section about this with no answers then found your tutorial i used to run slackware it was my first distro i installed and ran for about a year any ways thanks for the info keep up the good work
Old 01-11-2006, 10:57 AM   #11
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Originally Posted by madwifimoody
do you know which linksys/netgear ect ect. adapters that currently have the prism chipsets in them
Best thing to do is take a look at the hostap website, and perhaps contact the author of the driver.
Old 09-09-2006, 01:36 AM   #12
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Wow, this is much later than the other posts, but I would like to thank the author for a wonderfully written tutorial. I had numberous problems, definately the orinoco_pci driver problem, and a few other script problems, but they were all by fault of me. I kept re-reading the tutorial, and re-reading it, and finally got it! Thanks a bunch.

My new AP:
Slack 10.2
Linksys B card
....on a 233mhz laptop!

...and my college says "no wireless systems"

pfffft, it'll just look like a regular computer on the LAN



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