Enabling UPnP in Firewall of Ubuntu 9.10

[Nils Kassube]

Ioannis Vranos wrote:
> OS: Ubuntu 9.10 x64.
> Ubuntu comes with its firewall.

You mean ufw, right? Although it is installed by default it isn't 
enabled by default. Did you enable it? If yes, how?

> My router has also a firewall and it supports UPnP.

It is probably a NAT router and you can use UPnP to open specific ports 
or port ranges by your applications. But that has nothing to do with the 
router's firewall (whatever that may be).

> Some Ubuntu applications like Transmission, Pidgin, etc. support
>  UPnP.
> How may I make the Ubuntu's firewall support UPnP?

Can you explain why you think you need to enable UPnP on the Ubuntu 
machine? Is something not working? Although UPnP may be useful for the 
router it isn't useful for your Ubuntu machine, IMHO. BTW: I have 
disabled UPnP on my router but ktorrent works nonetheless without a 
problem.

Your application opens the necessary ports when you start it. Unless you 
have blocked the ports with the firewall, they can be used from your 
machine to the router. Now if you have blocked them, just don't do it. 
If you are behind a NAT router, the firewall will only protect from 
other machines on your LAN. If there are only your own trusted machines 
you don't need the firewall on your Ubuntu machine because your machine 
isn't reachable from the outside anyway, due to your router's NAT.


Nils