Re: New to RRAS for Routing

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Dear Bill,

Thank you for your explanation.

Regards,
Stephen

"Bill Grant" <not.available@online> wrote in message
news:uOD7dbumFHA.3020@xxxxxxxxxxxxxxxxxxxxxxx
> Perhaps you could read a basic text on IP routing. A newsgroup like
> this is a place for sorting out networking problems, not an academy. Here
> is a brief outline of the basics.
>
> To route between two subnets, you do not need any routes on the router
> itself. The router has an interface in each subnet, so it is aware of both
> subnets. If it receives a packet addressed to a machine in a subnet it
> delivers it directly (ie "on the wire" using hardware addressing). The
> important thing is that the packet must actually get to the router!
>
> Here is an example of the simplest case. All traffic goes to the router
> by default routing and is delivered in the "other" subnet.
>
> 192.168.0.x dg 192.168.0.1
> |
> 192.168.0.1 dg blank
> router
> 192.168.1.1 dg blank
> |
> 192.168.1.x dg 192.168.1.1
>
> If the default route is not to the internal router, extra routing info
> is required to get the required traffic to that internal router. eg
>
> Internet
> |
> gateway router
> 192.168.0.254
> |
> 192.168.0.x dg 192.168.0.254
> |
> 192.168.0.1 dg 192.168.0.254
> router
> 192.168.1.1 dg blank
> |
> 192.168.1.x dg 192.168.1.1
>
> In this case, routing between the subnets fails. The default route of
> the 192.168.0 subnet clients is to the gateway router, so the traffic for
> 192.168.1 never reaches the internal router. To make it work you must add
> extra routing in the 192.168.0 subnet to get traffic for 192.168.1 to the
> internal router.
>
> This is where you can use static routes. To get the traffic to the
> internal router you could add a static route
>
> 192.168.1.0 255.255.255.0 192.168.0.1
>
> If you add this route to a machine in the 192.168.0 subnet, that
> machine can be reached from 192.168.1 . If you add the route to the
> gateway router, every machine can be reached, because the gateway router
> "bounces" the local traffic to the internal router.
>
> Using a proxy server changes the requirements because a proxy server
> does not rely on default routing. The client has the IP address of the
> proxy server coded in and can address it directly. But if the proxy server
> is in another subnet, the proxy server must have the recessary routing
> information to be able to route the return traffic to the client.
>
> The LAT of a proxy server contains the addresses of all the subnets
> which are "local" (ie on the inside of the local network). So if you add
> an extra subnet to your LAN, you need to check that it is included in the
> LAT.
>
> Stephen S wrote:
>> Dear Phillip,
>>
>> Thank you for your advice. Maybe, I am new to Networking and Routing.
>>
>> Would you mind if I ask some more questions ?
>>
>> 1) In your point 1, all hosts on the LAN = Testing LAN ?
>> 2) In your point 2, the RRAS Router already connected to different LAN
>> segments. Does it mean that it is because I have enable "LAN
>> Routing" in Configure, Custom configuration; check the box for LAN
>> routing ? 3) In your point 3, do you mean the Internet Sharing Device
>> = Proxy Server in my office ?
>> 4) In your next mail, you mention there are entries have to be added
>> to the Local Address Table, how many entires have to be added there ?
>> a) Testing LAN Address
>> b) ???
>>
>> Thanks again.
>>
>> "Phillip Windell" <@.> wrote in message
>> news:enQt%23wcmFHA.576@xxxxxxxxxxxxxxxxxxxxxxx
>>> I didn't quote your posts because the questions in it cannot be
>>> followed with an answer according to the pattern and order you asked
>>> them. I will layout the pattern for the design here. It is very
>>> simple,...you are making
>>> it 10 times,..no, 100 times harder than it needs to be.
>>>
>>> 1. The RRAS box is the LAN's router. Therefore all hosts on the LAN
>>> use it
>>> as their Default Gateway. The RRAS Router then, in turn, uses the
>>> Internet
>>> Sharing Device as its Default Gateway
>>>
>>> 2. The RRAS Router is already directly connected to the different LAN
>>> segments, therefore it *already* knows about them,..because they are
>>> directly connected,...therefore you do not add static routes to the
>>> RRAS Router.
>>>
>>> 3. The Internet Sharing Device is only connected to one Internal LAN
>>> Segment,...therefore it is not directly connected to the other LAN
>>> Segments,...therefore it does not know about them like the RRAS
>>> Router does.
>>> Therefore the Internet Shareing Device needs a Static Route added to
>>> its routing table (*its* routing table, not the RRAS box's routing
>>> table) for the LAN Segments that it is not directly attached to. The
>>> RRAS Router would
>>> be the "gateway" used in the Static Route.
>>>
>>> All done,...simple and clean.
>>>
>>> --
>>> Phillip Windell [MCP, MVP, CCNA]
>>> www.wandtv.com
>>> -----------------------------------------------------
>>> Understanding the ISA 2004 Access Rule Processing
>>> http://www.isaserver.org/articles/ISA2004_AccessRules.html
>>>
>>> Microsoft Internet Security & Acceleration Server: Guidance
>>> http://www.microsoft.com/isaserver/techinfo/Guidance/2004.asp
>>> http://www.microsoft.com/isaserver/techinfo/Guidance/2000.asp
>>>
>>> Microsoft Internet Security & Acceleration Server: Partners
>>> http://www.microsoft.com/isaserver/partners/default.asp
>>> -----------------------------------------------------
>
>


.

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