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Old 08-24-2004, 01:54 AM   #1
nukenstien
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Multiple domains behind firewall


I have a few linux machines setup with apache, ssh, ftp services running on them. I use zoneedit to dns ips.

I have a linux firewall setup that has all of the urls dns linked to it.
firewall.domain.ca, domain.ca, halflife.domain.ca

The follow is the networking configuration I have setup

Internet
|
firewall.domain.ca
|
|----------|
domain.ca halflife.domain.ca



I want to be able to 'ssh firewall.domain.ca' and be connected to firewall.domain.ca
I also would like to 'ssh domain.ca' and be passed throught firewall.domain.ca and connect to domain.ca

I thought this command would work but it does not.

$IPTABLES -t nat -A PREROUTING -d domain.ca -p tcp -j DNAT --to-destination [domain.ca ip address]

I am looking for the command to pass all tcp traffic through the firewall to the linux box behind the firewall. I do not want the root of domain.ca to have root access to firewall.domain.ca.

Nuke
 
Old 08-24-2004, 08:04 AM   #2
david_ross
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Welcome to LQ.

There are a few solutions:
* Use 2 public IPs.
* Run the ssh servers on different ports.
* Only ssh into server 1 from the outside, then from there ssh to server 2
 
Old 08-24-2004, 01:25 PM   #3
nukenstien
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Thanks for the reply david

However when I use two external ips my cable modem slows to a crawl because I don't have a 100MB hub for connecting the computer to the cable modem.
The problem with running on different port is I would have to port forward every port that domain.ca would want to use.
SSH ing from 1 machine to the next would not work because I would also like various users to be able to ftp to their home directory, but they only have an account on domain.ca not on firewall.domain.ca
 
Old 08-24-2004, 01:42 PM   #4
david_ross
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Quote:
Originally posted by nukenstien
However when I use two external ips my cable modem slows to a crawl because I don't have a 100MB hub for connecting the computer to the cable modem.
Why would it slow down? I'm not suggesting making any infrastructure changes.
 
Old 08-25-2004, 12:00 PM   #5
nukenstien
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It slows down because with my cable modem, even though it is only 5Mb down and 1 Mb up, if you switch from a 100MB connection to a 10MB connection the speed goes down.
I have the cable modem plugged into my linux box with a 100MB card so it connects at 100MB but when I plug the cable modem into my hub, to allow both computers external ips, the hub is only 10MB so it only connects at 10MB.
I do not know why it slows down if it is not reaching the hardware limit.
 
Old 08-25-2004, 12:44 PM   #6
david_ross
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I'm still not sure why it would slow down. BUT:
Quote:
Originally posted by david_ross
I'm not suggesting making any infrastructure changes.
 
  


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