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Moving from ISA to Cisco Router

Posted on 2006-06-22
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Last Modified: 2010-03-18
We have a server running Microsoft Small Business Server 2003.  We are getting a Cisco 1811 dual WAN router.  Since we will be using the router we do not need ISA, right?  If so, how do we turn ISA off?  Or, what pieces of ISA do we need to turn off and how?  Also, could someone give me a quick explanation of what ISA is and does?  Is it just a firewall?

*Please do not assume that I know what you are talking about.  I do not have much network training/experience.

Any help would be greatly appreciated.  Thank you.
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Question by:mgiuliano
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by:prashsax
ID: 16964036
It is not necessary to switch off ISA just beacuse now you are getting a router.

You ISA could still work as firewall and proxy server, if you are happy with it.

But, if you want to use router as a firewall, then you may want to disable the ISA.

Although ISA would allow you to control internet access more easily and effectively rather than a router.

ISA is a firewall and a Cache proxy server. It allow you to control internet access based on userid, computer IP address, protocol etc.

Router would allow you to control internet based on IP address and ports only. It cannot do it on per user basic. ISA can do it.
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by:mgiuliano
ID: 17004733
We want to use the router for the firewall, VPN, and the dual LAN function.  We are using proxy.  If we disable ISA does that mean the proxy is disabled too, and all the workstations have to uncheck the proxy setting in the internet options?

ISA has more features, but which is more secure?  Do you think it is easy for someone to change settings on the router who has no Cisco training/experience?

Do you recommend staying with ISA?
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by:prashsax
ID: 17004801
You need some cisco training to manage routers.

If you are good with ISA, you can stay with it.

ISA can do whatever you want to do with router.

ISA supports VPN.

ISA 2004 can run dual LAN in DMZ configuration.


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Author Comment

by:mgiuliano
ID: 17020618
I appreciate your help with ISA and routers.  I think we are going to go with the router.  Since we are going to use the router as the firewall, how do we disable ISA?
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prashsax earned 250 total points
ID: 17020676
If you still require ISA to work as Proxy server, you can let it run.
You can configure your ISA to a single NIC mode. In this mode ISA will work as Proxy server and not as firewall.
This link will tell you how to configure ISA with Single NIC.
http://www.isaserver.org/tutorials/unihomedisa1.html


Now, I assume your default gateway on all client machines and server is set to ISA.
Change it, and assign routers LAN interface IP as your default gateway.

Then you can control access using access-list on router as well.



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by:mgiuliano
ID: 17053802
Thank you.   I have not tried this yet but I will when we get the router.
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