Connecting a Cisco router to an ISP DSL wireless router

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Aug 26th, 2008
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I have a client who has a small business and recently got a bus DSL (4 static IP addresses) through AT&T. Everything works well for him execept that the DHCP on the wireless router (Motorola Netopia) only allocates 4 ip addresses to hosts. I am thinking about setting up a Cisco router with DHCP but I am not sure what's involved in terms connecting the cisco router to the netopia router. Can someone point me in the right direciton?


Thanks in advance,

sK

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Giuseppe Larosa Tue, 08/26/2008 - 11:01
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Hello Sadik,

the router has to get an ip address from the netpia.

It needs to NAT to this ip address the whole DHCP scope it serves on the second interface.


use a private address RFC 1918 for the scope


Hope to help

Giuseppe

skhirbash Tue, 08/26/2008 - 12:34
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Thanks Giuseppe!


So, I need to assign one of the public ip addresses on the Cisco interface that is linked to the Netopia router, correct?


Also, do I disable the NATing on the Netopia router and enable it on the Cisco router?


Thanks much,

SK

Giuseppe Larosa Wed, 08/27/2008 - 10:18
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Hello Sadik,


>> So, I need to assign one of the public ip addresses on the Cisco interface that is linked to the Netopia router, correct?


If you have a small pool of public IP addresses you can do so and of course you don't need NAT on the Netopia.


If you just have a single public IP address on the wan interface of Netopia you can only assign a private IP address to the Cisco and you still need NAT on Netopia and on the Cisco as well


Hope to help

Giuseppe


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