Look at it this way. An IP router will forward traffic from one subnet
to the other. The critical thing is that the traffic actually gets to the
router.
In the simplest case, there is only one router and it is the default
gateway for both subnets. It just works with no extra routing. eg
192.168.1.x dg 192.168.1.254
|
192.168.1.254 dg blank
router
192.168.21.254 dg blank
|
192.168.21.x dg 192.168.21.254
If one subnet is set to use some other gateway, routing fails because
the traffic for the other "local" subnet never gets to the internal router.
It goes to the default router for the subnet (such as an Internet gateway)
and is lost.
You can solve the problem by making the router a NAT router. Everything
then works because the traffic from the "inner" subnet is using the "public"
IP of the NAT router which the Internet router nows about.
Internet
|
gateway router
192.168.1.1
|
192.168.1.x dg 192.168.1.1
|
192.168.1.254 dg 192.168.1.1
NAT router
192.168.21.254 dg blank
|
192.168.21.x dg 192.168.21.254
Traffic from 192.168.21.x machines can now see the other private
subnet and the Internet because the are using the NAT router's 192.168.1.254
address on the 192.167.1 segment.
Without NAT, you need extra routing on the 192.168.1 subnet so that it
knows how to reach the inner subnet. Something like
192.168.21.0 255.255.255.0 192.168.1.254
If you put that route on one machine in the 192.168.1 subnet, that
machine would be able to route. If you put it on the Internet gateway
router, all machines would be able to route.
"Wrighty" <(E-Mail Removed)> wrote in message
news:759E34C0-5EEC-44F4-9768-(E-Mail Removed)...
> Thanks for the reply.
>
> Sorry, i forgot to mention in my post that i have installed RRAS.
>
> I assumed that if any devices on the 10.20.100.0 network had their default
> gateway set to the ip address of NIC2 on W2K Router (10.20.100.1) then it
> (the W2K Router) would automatically forward those packets onto NIC1 on
> the
> W2K Router (10.4.60.1) and gain access to devices on that subnet?? Am i
> missing something obvious here or do i need to do something else to make
> this
> work?
>
> Cheers
>
> "Phillip Windell" wrote:
>
>> You have to use RRAS (Routing and Remote Access Service).
>> RRAS is the "routing software" for Windows 2000 and newer,...NT4.0 (both
>> Server and Workstation) could do it without RRAS although there was a
>> downloadable old version of RRAS that could be added to NT4.0 (Server
>> only)
>> that would expand the abilities of what could be done.
>>
>> There was supposed to be a way to hack the registry to run routing on
>> 2000
>> and newer without RRAS, but to me it isn't worth the trouble. It was
>> more
>> commonly done on Windows 2000 Professional or XP Pro that could not have
>> RRAS installed.
>>
>> It is not likely that you will use any "routing protocols", so don't
>> bother
>> messing with those. Simple routing is all you need.
>>
>> --
>> Phillip Windell
>> www.wandtv.com
>>
>> The views expressed, are my own and not those of my employer, or
>> Microsoft,
>> or anyone else associated with me, including my cats.
>> -----------------------------------------------------
>> Understanding the ISA 2004 Access Rule Processing
>> http://www.isaserver.org/articles/IS...cessRules.html
>>
>> Troubleshooting Client Authentication on Access Rules in ISA Server 2004
>> http://download.microsoft.com/downlo...7/ts_rules.doc
>>
>> Microsoft Internet Security & Acceleration Server: Partners
>> http://www.microsoft.com/isaserver/partners/default.asp
>>
>> Microsoft ISA Server Partners: Partner Hardware Solutions
>> http://www.microsoft.com/forefront/e...epartners.mspx
>> -----------------------------------------------------
>>
>> "Wrighty" <(E-Mail Removed)> wrote in message
>> news:CC14F093-3081-42E7-840B-(E-Mail Removed)...
>> > Hi,
>> >
>> > Is it possible to configure W2K server so that it behaves like a
>> > router?
>> > For
>> > example if i have 2 subnets, one on 10.4.60.0 and the other on
>> > 10.20.100.0,
>> > will it pass packets from one to the other? I dont seem to be able to
>> > get
>> > it
>> > to work.
>> >
>> > I have 2 NICs in my w2k server that im using as a router. NIC1 has the
>> > ip
>> > address 10.4.60.240 with a gateway of 10.4.60.1 (this gateway is a
>> > cisco
>> > router and this is connected to the "live" network i.e. has internet
>> > access)
>> > NIC2 has the ip address 10.20.100.1 (this has no gateway) and is
>> > connected
>> > to
>> > a single hub that has 1 test server connected to it. This test server
>> > has
>> > the
>> > ip address of 10.20.100.228 with a gateway of 10.20.100.1 (this is the
>> > ip
>> > address of NIC2 on the W2K server router), which i want to be able to
>> > connect
>> > through to the 10.4.60.0 network via the router.
>> >
>> > Here is the problem, from this test server the only device i can ping
>> > or
>> > access on the 10.4.60.0 network is NIC1 of the W2K server router
>> > (10.4.60.240) and nothing else!
>> >
>> > I hope how i have explained things makes sense to someone? Does anyone
>> > know
>> > what I am doing wrong?
>> >
>> > Any help or advice would be great!
>> >
>> > Cheers
>>
>>
>>
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