Upload Warning e-mail
When a member uploads more than 1GiB data during 24h, he receives an e-mail to warn him and notify him that abusive upload is a reason for disconnection.
Upload consists in sending data outside Cr@ns network. (Facebook is outside Cr@ns networks, this wiki isn't (non-comprehensive list)).
I received a warning e-mail
That's not me!
“Yes it is!”
Most members first react by saying they did not upload. If our firewall detected upload coming from your machine, then your computer has indeed sent that amount of data.
False-positives are extremely rare and could be due to identity theft on the network. Please consider that this is a severe accusation.
Is it due to Skype?
If you're doing using video communication (with skype, for instance), it's most likely the reason for your upload.
Why is it doing that?
Upload can be due to various reasons, which you can be aware of or not :
- Sending big files (FTP to outside, SCP, dropbox, …)
- Video communication
- p2p : peer-to-peer is a sharing protocol. You retrieve data, but you are sending them as well. (We recall that peer-to-peer is forbidden on Cr@ns network, as written on the registration form you signed when you became member of the association).
- streaming : many streaming software resend the watched video, so that other users can watch it too without overloading the transmitting server. Those softwares are usually configured in a way which doesn't fit a symmetric bandwidth, which we do have in Cr@ns. Check your software configuration.
- Some software do it without telling the user. This also one of the reasons why we send this e-mail : to make you realize it.
- You may be victim of a virus, which uploads hidden. It's always a good idea to run an updated antivirus scan (a real one, not an other virus).
Is it harmful?
Usually, there is nothing dreadful. The limit you shouldn't reach is 8GiB. We send the mail much sooner to warn people in advance, and also to try and avoid some naughty guys to stay right below the line every day and saturate the network.
If it happens regularly and you are not aware that you are sending something, then there is a problem. You can contact us if you're certain not to be the source of your upload.
Find the origin
On Linux, you can use nethogs to see which processus use bandwidth.
- On Windows 8, the task manager allow natively to see which programs are sending data.
On others Windows versions,you can freely use the software Free Process Traffic Monitor.