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-   -   Skype for linux opens TCP and UDP port directly on router? (

blocker 13th September 2012 16:48

Skype for linux opens TCP and UDP port directly on router?

i have noticed a strange thing. In my router there is a port forward that i did not made. It is even not visible in the manual port forwarding menu, it is only visible in the port forwarding log:

Destination Proto. Port Range Redirect to
all TCP 31929
all UDP 31929

i have tried telnet from my network, and from outside to this port, and it connects, the connection stays active 4-5 seconds then it drops

# telnet MY_REMOTE_IP 31929
Trying MY_REMOTE_IP...
Connected to MY_REMOTE_IP.
Escape character is '^]'.
Connection closed by foreign host.

on i have checked which service is running on this port, and guess what??? it was skype!!!

when i quit skype, ports close, but this redirect still stays in my router table, even if i refresh.

i have for 2 weeks reinstalled this PC with debian and downloaded skype from the official site as .deb package.

the questions is how did skype managed to open those ports on my router and redirect them to the PC on which skype is running


why does skype needs those ports

i will be happy to hear your opinions!

blocker 13th September 2012 17:21

i have now disabled UPNP server, PPTP forwarding and reseted the router password, the skype again manages to open these ports

i checked and in the skype settings the port i mentioned above is set for incoming connections

i sniffed on that port with tcpdump, while skype was on, and it seems that there are connections to and from a number of M$ IP's...

blocker 14th September 2012 12:58

same happens when i start skype on my android phone

smith23 15th November 2012 06:40

mmm the same ...

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