what does this mean?

[bernieszu]

Hi all,
Got this message in dmesg when I was trying to see why my ktorrent was acting funny.
What does it mean and should I be worried?

[ 1511.765512] possible SYN flooding on port 6881. Sending cookies.

[claydoh]

Re: what does this mean?

Are you running bittorrent? that port is a common one used by ktorrent. your system may be seeing many incoming hits on that port as a possible attack.

some info here
http://www.probertencyclopaedia.com/...ookie&offset=0

[bernieszu]

Re: what does this mean?

Hit the nail right on the head.
Thanks!

[GreyGeek]

Re: what does this mean?

Are you running bittorrent? that port is a common one used by ktorrent. your system may be seeing many incoming hits on that port as a possible attack.

some info here
http://www.probertencyclopaedia.com/...ookie&offset=0

Or, you may have a file downloaded using bittorrent and since you haven't deleted it after installing it, you are acting as a seeder for others using bittorrent to download that file. If so, you can check the rate out outgoing packets or bytes to see if you have a continuous flow of outbound traffic.

You can open a konsole and issue

sudo netstat -lp

to see a list of inbound and outbound connections and the programs using them.