Re: Does ICS or Firewall have a NAT
- From: "Descartes" <descart(AT)-REMOVE-THIS-welho(DOT)com>
- Date: Mon, 16 Jan 2006 01:59:37 +0200
Thank you Joe, Steve and Kerry for all your input.
I think I know now how to proceed.
Best regards
Descartes
"Kerry Brown" <kerry@xxxxxxxxxxxxxxxxxxx*a*m> kirjoitti
viestissä:ensnd0hGGHA.1028@xxxxxxxxxxxxxxxxxxxxxxx
> Steve Winograd [MVP] wrote:
>> In article <OzS9IrfGGHA.3936@xxxxxxxxxxxxxxxxxxxx>, "Kerry Brown"
>> <kerry@xxxxxxxxxxxxxxxxxxx*a*m> wrote:
>>> Descartes wrote:
>>>>> Yes, ICS uses NAT.
>>>>>
>>>>> What do you mean by "static mapping"? What exactly do you want to
>>>>> do? --
>>>> Well I read somewhere, that a NAT creates a mapping of an intranet
>>>> computers request out to the Internet. When a response arrives from
>>>> the internet, the NAT looks in its mapping, to which intranet
>>>> computer it should forward the response. This mapping is created
>>>> dynamically and deleted when not needed anymore. The side effect of
>>>> this is that the NAT actually works as a kind of fire wall
>>>> neglecting all inbound traffic for which it does not have a
>>>> mapping. This is all OK and does not require static mapping. But,
>>>> if I would set up a server (on the intranet) to be accessible
>>>> from the Internet, the NAT would need a static (persistent) mapping
>>>> to know to which computer forward the requests coming from the
>>>> Internet and addressed to the server.
>>>> Please correct me if this doesn't make sens at all.
>>>
>>> Yes, ICS can do what you want. A stand alone router is a better idea
>>> for a couple of reasons.
>>
>> I agree that a router is usually better than ICS, Kerry. But a router
>> can't do the job if you're sharing a non-Ethernet Internet connection,
>> like a dial-up modem or a USB cable modem.
>>
>>> 1) Using ICS the gateway computer is dirctly exposed to the Internet
>>> on the public interface. A router will give all computers some level
>>> of protection from malware. ICS will give all the other computers
>>> this level of protection but the computer running ICS will still be
>>> exposed.
>>
>> The ICS computer should be fine if it's running Windows Firewall.
>> However, a router plus firewall gives two layers of protection.
>>
>
> Two layers is always better.
>
>>> 2) The computer running ICS must be on for the other computers to
>>> access the Internet. The computer running ICS will run slower
>>> because of ICS. You may or may not notice this depending what else
>>> the computer is used for.
>>
>> I can't imagine that ICS would have a noticeable effect. A typical
>> broadband router has much less memory and a much slower processor than
>> any computer that can run XP. For example, my SMC Barricade router
>> has a 40 MHz CPU and less than 1MB of memory
>>
>
> I have seen otherwise respectable machines have a noticable slowdown,
> especially when dialing, when a some winmodems are used with ICS. As you
> say normally not a problem, but it can be noticable.
>
> Kerry
>
>
>
.
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