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Subnetting a wireless network


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bluemike's Avatar
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12-Jul-2004, 01:01 PM #1
Cool Subnetting a wireless network
I need some guidance on subnetting a wireless network.

Currently, we have a T1, wired network using DHCP. We want to keep the wired network wired. We would like to add a wireless access point for our in-store customers to use. We want to keep the wireless users from being able to browse our internal network. I am thinking of subnetting....

The firewall we now have (a SOHO 6) has a builtin DHCP that we use. If I get a wireless AP, how do I keep the DHCP numbers from conflicting with one another? I mean, both the AP and the FW will have to have the same external IP, DNS, etc., so won't they conflict somehow?

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12-Jul-2004, 03:48 PM #2
You could try this by way of suggestion. The following uses IP address by way of illustration you don't have to adopt the numbers. The issue of DHCP conflicts in this setup should not arise.

Set the LAN IP on the router to 192.168.0.1 and change its DHCP server address range to 192.168.0.2 - 192.168.0.254.
Leave the AP to get its outward-facing IP and DNS addresses as a DHCP client (on Basic Settings, Internet IP address, get dynamically from ISP) & (Domain name server address, Get automatically from ISP) so that it gets them from the router.
Set the DHCP server on the AP (LAN IP setup, Use router as DHCP server) to give out 192.168.1.2 - 192.168.1.254 to the wireless PCs and any hardwire PCs you want to add on that sub-net.

You'll need to re-boot router, AP and PCs to allow distribution of IP addresses etc. Power up the router first and leave it until it has got the connection up. Then power on the AP and wait about for it to boot and get addresses from the router. It should have have got the first address in the range, 192.168.0.2, gateway 192.168.0.1 and should have been assigned one or two DNS addresses which might actually be the gateway address again. Connecting PCs to the AP will have IPs starting from 192.168.1.2, Gateway 192.168.1.1 and DNS address(es) (I think for DNS you will get the gateway address which is also fine).

Useful reads include: "Understanding IP Addressing" at http://www.3com.com/other/pdfs/infra..._US/501302.pdf and "IP Addressing and Subnetting for New Users" http://www.cisco.com/warp/public/701/3.html
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12-Jul-2004, 03:48 PM #3
Do the wireless clients need to connect at all to the wired? If not, just set up the pool of IP's on the wireless devices DHCP to use a seperate network all together. For example, if using 192.168.1.x on the wired side, then use 192.168.100.x. Off the cuff I think this will work.

Dave
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12-Jul-2004, 06:08 PM #4
The two networks don't need to be able to see each other, but they will both be sharing the same external static IP.
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12-Jul-2004, 06:13 PM #5
Then the two subnet approach in both of the preceding messages above should do the trick.
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13-Jul-2004, 07:44 PM #6
A bit of a change. I just realized that we have 6 static IP's through our ISP. So I think I'll assign one of those statics to the AP. If someone looks at a porn site, I want to know if it was a customer ;P

Since the two networks will be using seperate static IP, will I need to even worry about inter-network access?
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