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Adding wireless router on existing office network with different IP convention

Posted on 2009-04-14
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I would like to add wireless router on existing LAN with different IP convention.

My objective is to add a wireless environment on exsiting network with the follwoing IP requirement:

LAN- 172.16.1.x (DHCP enabled)/ Router+modem
Wireless- 192.168.1.x (should enable DHCP service)

So any wireless machine that wants to connect to wireless network to access the Internet will never see the exisitng LAN network that we have.

need you help. thank you
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Question by:charles_lawrence
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by:ryan80
ID: 24136017
This is not as easy as it seems.  You will need a switch that can deal with different VLANs and a good programmable router that will be able route both of the VLANs to the same gateway without seeing each other.  This will cost a decent amount of money.

One work around that I have done before with a AD infrastructure is like this.  Set up the wireless router with the WAN port on the 172. subnet.  make the WLAN side on the 10. subnet.  Set up an IP Sec policy so all the computers on the 172. subnet will ignore the 10. subnet.  

It is not a perfect world, but it will save you a $1000+ dollars and is easy. Depends on how secure this solution has to be.  You can also just get another internet connection.
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by:charles_lawrence
ID: 24137131
ok. i just want to be clear on my inquiry.

the wireless network that i want to configure will be on 192.x subnet, this is only for customers or visitiors who wants to connect to Internet on our office. roughly around 20-30 IPs distributed thru wireless router dhcp.

Our office existing network is 172. subnet, NO WLAN.

I need to configure WLAN with 192.x subnet that will serve our customers and visitors, and mix it with 172.x subnet office LAN, we have only 1 internet line connected to our office router.
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ryan80 earned 500 total points
ID: 24138259
yup, then you would have the 2 options.

1. Invest in some hardware, a switch that can do VLANs and a router that would be able to route those VLANs to the same internet connection. This is the better solution, but will cost money in hard ware.

2. Set up the wireless router with the WLAN on the 192.x subnet and the WAN on the 172.x subnet. You will then have to use Group Policy to create an IPSec rule so all the computer on your network will ignore any traffic from the 192.x subnet.  This way any computer on the 172.x subnet will not be reachable from the 192.x subnet. This is depedant on your network being an Active Directory network.

I was just thinking that you could also set up a static route on the wireless router and not have to set up an IPSec rule.  i just did a search about this and found this link:

http://www.dslreports.com/faq/12676
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