[ILUG] RTSP over NAT + more

[John Allman]

Ronan O Ciosoig wrote:

> I want to get Apache, JBoss, smtp, pop3, ftp, and Quicktime Streaming 
> server running and do this with a 3Com ADSL router, and also with a 
> ZyXel router.

I'm sure this is a phenomenonally stupid question, but you want to run 
them on your internal network and make them available to the outside world?

> The obvious thing is to enable NAT and translate all ports to the 
> outside but I have been having a lot of difficulty with getting that 
> working. What's the best way to test out a configuration change?

See this is what's confusing me. You could mean that you want to source 
nat everything on the way out (which should be very simple and your 
router should be able to handle) or that you want to destination nat all 
incoming traffic from the internet to the router to an internal machine. 
I'm going to assume the second one is what you're talking about and i'm 
going to assume that you have that successfully set up on the router

> If I am behind a router, I cannot see what ports are being opened on 
> the other side using portscan. My IP is 192.168.1.32 and the public IP 
> is say 80.132.223.12. When I port scan the public IP nothing comes up.
>
> So is it necessary to use another machine outside my LAN to verify this?
>
I'm assuming you're talking about a machine that has two network 
interfaces, one on your private network and one on a network that 
connects to your dsl router. If you really are unsure about your 
firewall rules or just want to portscan it for whatever reasons, would 
the obvious thing not be to change the ip address of your machine and 
connect it to the other network that the other interface of the machine 
in question is attached to? Then you should be able to access it like 
anything else from the real world?

So, i'm not really sure what exactly you're looking for but if i guessed 
right that *might* be of some help?

John