Used Ports

[Chronoc]

I manage a  dedicated server (ubuntu lts), standing in an computing center, with several btsync shares running (without problems). The listening port is 28174, but netstat tells me that there are some other ports opened by btsync... can someone explain me for what there are needed, and maybe how i can close them if I don't need the corresponding feature?

netstat -npl |grep btsynctcp        0      0 0.0.0.0:28174           0.0.0.0:*               LISTEN      7003/btsync-daemonudp        0      0 X.X.X.X:5351            0.0.0.0:*                           7003/btsync-daemonudp        0      0 0.0.0.0:28174           0.0.0.0:*                           7003/btsync-daemonudp        0      0 0.0.0.0:3838            0.0.0.0:*                           7003/btsync-daemonraw        0      0 0.0.0.0:1               0.0.0.0:*               7           7003/btsync-daemon

The port 5351 is opened only a few seconds after restarting the daemon...?

 

All my shares have search_lan and use_dht disabled, and all except one have use_relay_server and use_tracker disabled also.

[Harold Feit]

UDP traffic is used to communicate between systems.

 

3838 is used as an alternate port for communication.

 

Is the x.x.x.x an address in one of the ranges listed in RFC1918?

 

The short version is, you probably can't close the ports without breaking things.

[Chronoc]

Hi,

 

thanks for your reply.

 

No, the X.X.X.X is the external (official) address. This port is listening only a few seconds after starting the daemon, then it is closed.

 

Why there is a fixed port needed for communication? I have read, that it must be opened in firewalls...

http://forum.bittorrent.com/topic/16628-wich-ports-should-be-oppened/

 

And for what is the raw port needed?

[Harold Feit]

The fixed port is needed typically in case of the preference port getting blocked either by overzealous ISPs or poorly designed hardware. It's needed in case of those blocks on EITHER end of the communication.