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two lans, one gateway, no interaction at all but internet.

Hello all!

I have two lans

A) 192.168.2.0 - 192.168.2.255 Gateway: 192.168.2.1
B) 192.168.3.0 - 192.168.3.255 Gateway: none
I want to give internet access to lan B, but i DONT want any interaction at all between lan A and lan B.  

or maybe i can put them together (all in 192.168.2.x and gw:.2.1) , but how can i avoid interaction between them?

i've been reading subnetting for about 1hr and nothing came tru.

What can i do?

Thanks in advance.
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HTorres
Asked:
HTorres
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1 Solution
 
Chris DentPowerShell DeveloperCommented:

Assign a second IP to your Gateway device to give it a presence on LAN B (something like 192.168.3.1).

Then really it would be a good idea to have a Firewall to ensure unauthorized traffic doesn't get from one network to the other.

What is your gateway? If it's just a router you may consider installing a Firewall on a machine in front of the router.

HTH

Chris
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HTorresAuthor Commented:
Thanks Chris,

How do i assign a second ip to the router?  i have a smc7004vbr as router/firewall

here i got lost:
"installing a firewall on a machine in front of the router"....

the A net is like this:
internet <- dsl <- switch/router <- computers

the B net is like this:
                          switch/router <- computers


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Chris DentPowerShell DeveloperCommented:

Grabbing the manual for the router.

It claims to have full statefull firewall capabilities which would remove the need for an additional Firewall.
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Chris DentPowerShell DeveloperCommented:

Unfortunately you can't bind multiple IP addresses to the LAN interface of the router.

That still leaves this kind of option:

Network A:
Internet <---> DSL <---> Router <---> Firewall (Net A IP) <---> Switch <---> Computers

Network B:
Internet <---> DSL <---> Router <---> Firewall (Net B IP) <---> Switch <---> Computers

Unfortunately this would require the Switch and the Firewall - although an old PC could easily be the Firewall.
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HTorresAuthor Commented:
Thanks CHris

nope, the smc7004vbr cannot have two ip. it has a basic (yet powerful) design ... but no support for two ips.

what else can i do?
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HTorresAuthor Commented:
i did check the manual
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Chris DentPowerShell DeveloperCommented:

Me too... just had to download it first ;)

As far as I can see the only way to keep them completely seperate is to put another Firewall (or router) in and controlling traffic flow on that.

Using just the current hardware it they would have to share an IP range to both have access.
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HTorresAuthor Commented:
so i need to buy another router.

or leave them like this:

A NET
internet <- dsl <- switch/router <- computers

B NET
(lan a router) <- switch/router <- computers

correct? , let me try
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Chris DentPowerShell DeveloperCommented:

A LAN router would work yes :)
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HTorresAuthor Commented:
Thanks Chris!!!, let me ask the pillow.

Any other comments welcome yet.
Anyone?
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