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Old 07-17-2001, 07:51 AM   #1
teeno
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Question How can I get access to a computer on my LAN?


All I want to be able to do is forward all packets directed to my external IP address to a computer on my LAN.

Is it possible? If so how?

My external IP address is: 12.232.14.6
The linux box has an IP address of: 192.168.10.154
My computer on the LAN has an address of: 192.168.10.16

I need all traffic sent by my computer to be translated from 192.168.10.16 to 12.232.14.6.

All traffic received on 12.232.14.6 to be directed to 192.168.10.16.

Could some one please explain why this canít be done?

Thank you.
 
Old 07-17-2001, 08:06 AM   #2
jharris
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this can be done - You want IP Masquerading (AKA NAT)!! This will do this for you... Have a look at http://www.linuxdoc.org/HOWTO/IP-Masquerade-HOWTO.html for details. You basically just get both network cards running then, enable masquerading (2 commands) as per the howto and enable forwarding (as per howto, 1 command) then set this box as your default gateway and that should be it.

HTH

Jamie...
 
Old 07-17-2001, 08:21 AM   #3
teeno
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Thank for responding to my question.

However, I already have masquerading working on the linux box and it is not doing what I need.

I need to be able to address my computer on the LAN then the external IP address. This means that all the traffic directed to the public IP address (external) has to pass though the linux box and routed to my local computer. This makes the linux box transparent.

Is this possible?

Thank you again for your help.
 
Old 07-17-2001, 08:26 AM   #4
jharris
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Now I understand... What services do you need to make available? It sounds like you need to have some sort of port forwarding working, so access to 12.232.14.6:80 gets passed through to 192.168.10.16:80 kind of thing. Either that or you could enable masquerading the 'other way', so any connections that come in to 12.232.14.6 get masqueraded back into the network, although this will give you serious security issues and I'm not sure what the return path of your packets would be.

cheers

Jamie...
 
Old 07-17-2001, 08:40 AM   #5
teeno
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I have had port-forwarding working. Its fine but I need to forward too many ports and it doesn't work properly.

I just canít understand why the IP address cannot be map though. I will try to able masq both ways but I can't see how it could work.

Do you know of any good sources of info?
 
Old 07-17-2001, 08:44 AM   #6
jharris
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Quote:
Originally posted by teeno
I just canít understand why the IP address cannot be map though.
Its becuase you can't set a route to your internal IP addresses as they're private address space... Unfortunately I can't offer any references for the masq option, its was just thought really.

HTH

Jamie...
 
  


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