Allow torrent traffic

tech_soul8 · 08-27-2012, 11:35 AM

Hello folks

This is my iptables configuration:

*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT DROP [0:0]
:firewall-eth0-INPUT - [0:0]
-A INPUT -j firewall-eth0-INPUT
-A FORWARD -j firewall-eth0-INPUT
-A OUTPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A OUTPUT -p icmp -m state --state NEW -m icmp --icmp-type any -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -m tcp --dport 53 -j ACCEPT
-A OUTPUT -p udp -m state --state NEW -m udp --dport 53 -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -m tcp --dport 443 -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -m tcp --dport 110 -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -m tcp --dport 25 -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -m tcp --dport 2049 -j ACCEPT
-A OUTPUT -p tcp -m state --state NEW -s 192.168.200.17 -d 192.168.200.30 -m tcp --dport 23 -j ACCEPT
-A OUTPUT -j LOG --log-prefix "fw-eth0-out-rejected"
-A OUTPUT -j DROP
-A firewall-eth0-INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A firewall-eth0-INPUT -i lo -j ACCEPT
-A firewall-eth0-INPUT -s 192.168.200.16/28 -p icmp -m icmp --icmp-type any -j ACCEPT
-A firewall-eth0-INPUT -j DROP
COMMIT

I have Vuze torrent client installed. I want to allow torrent traffic so I can download torrents without changing (setting all to allow) my iptables configuration. The problem is when I check my log file I see blocked torrent traffic but it always comes from different source and destination TCP/UDP ports.

Is there a way I can solve this? Are there some port ranges Vuze is using or something like that?

John VV · 08-27-2012, 12:36 PM

What ports did YOU set for vuze ?
the default 6881 tcp/udp
some isp's do "mess" with that
ports in the 50,000 to 65,535 range have been advised

use the vuze GUI to set what ports to use
then use your distros GUI to set the tcp and udp ports

eSelix · 08-27-2012, 12:41 PM

You need to allow incomming and outcomming UDP and TCP connections for ports configured in Vuze in Options / Connection. By default it uses random port, so you need to change it.

Code:

iptables -A INPUT -p tcp -m state --state NEW --dport port_number_here -j ACCEPT
iptables -A INPUT -p udp -m state --state NEW --dport port_number_here -j ACCEPT
iptables -A OUTPUT -p tcp -m state --state NEW --sport port_number_here -j ACCEPT
iptables -A OUTPUT -p udp -m state --state NEW --sport port_number_here -j ACCEPT

Check also other list of ports used by Vuze.

tech_soul8 · 08-27-2012, 01:27 PM

Thanks guys!

Vuze now is automaticaly set up to use port 47983 for incoming connections. So I added TCP/UDP rules for 47983 port and now it is ok.
But this is a little bit confusing to me. Why I need to create rule in my OUTPUT chain with source port 47983 when Vuze is using this port for incoming not outgoing connections? Hm...

eSelix · 08-28-2012, 04:58 AM

Quote:

Originally Posted by tech_soul8

... Vuze is using this port for incoming not outgoing connections

Like in other P2P programs it needs to initiate connection to remote clients, to download data and send search questions for files you want to download, as well listen for incomming connection to deliver data to others and get answers on search. They also exchange other data, more or less necessary, to achieve the goal for which they were created. These P2P applications act as client and as server.

tech_soul8 · 08-28-2012, 07:14 AM

Thanks...