hi!
thank you. could you point me to a documentation related to what im trying to do?
what service(s) should be running on my linux box? (i want to try ubunto. is this a ok?)
thanks!
From: Rafael 'Dido' Sevilla <[EMAIL PROTECTED]>
Reply-To: Philippine Linux Users Group Mailing List <plug@lists.q-linux.com>
To: Philippine Linux Users Group Mailing List <plug@lists.q-linux.com>
Subject: Re: [plug] NAT queries
Date: Wed, 18 May 2005 14:11:57 +0800
On Wed, May 18, 2005 at 01:29:58PM +0800, Joey . wrote:
> hi!
>
> let me try to rephrase and i hope i can make myself clearer.
>
> is it possible to discuss NAT without talking about internet? i just need
> to make LAN A access an application in LAN B.
>
> LAN A (172.22.1.x) is directly connected to Japan via 256kbps leased line.
> this is so because we have an application (not web based) whose database is
> in Japan.
>
> LAN B (192.168.0.x) is our internal private network. LAN A needs to access
> the intranet in LAN B.
>
> is NAT the way to go with this?
That is SO MUCH better. No, I don't think you need to use NAT in this case then. Since the two subnets are totally distinct, then there should be no problem doing direct routing between them; no need to mess with NAT and all the complications it creates. Network address translation creates a lot of problems by itself, and I would not use it unless there were no other alternative. To do this, obviously you'll need a router that has one interface on LAN A and a second interface on LAN B. Once the router (which may well be the Linux box you intended to use as a NAT box), has been set up properly, all you need to do is get the machines you want to use it for routing to the opposite subnet. This can be accomplished by adding the appropriate static routes to the default gateways on each subnet, or by manually adding static routes to all of the concerned machines (on both subnets! This could be painful!).
This has the added benefit (that you lose with NAT) that all machines on your network can see one another as though they were on the same network. You can connect into machines from Network A from Network B and vice-versa. If this is a liability, it is much better and more flexible to use firewall rules on the gateway.
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