Comment 13 for bug 310035

I'm having the same problem, my ADSL connection drops when uploading at full speed over pppoe (including torrents). Downloading works fine and the connection never drops, while on Windows both downloading / uploading work fine. The difference I've noticed between Windows & Ubuntu 9.04 was the upload speed. While on Windows was about 1.5MB/s, on Ubuntu it was about 4-5 MB/s (till the connection dropped, at most 2-3 minutes).

I've tried changing MTU & MRU from 1492 to 1400 for ppp0, disabling multicast for ppp0 & eth0 - the issue still occured. After many hours, I found quite a strange solution, since eth0 has auto-negotiation and it seems to work well (it finds a 100Mb/s full-duplex connection). However, this solved the issue: "sudo ethtool -s eth0 autoneg off speed 100 duplex full". So, "ethtool eth0" shows me the same configuration when using autoneg on / off, but when it's off the upload speed is limited to about 1.5MB/s as in Windows and it doesn't disconnect.

On the other issue, my Network Manager reconnects itself, but you have to check if the ADSL connection has the auto-reconnect checkbox checked. I have two connections, the dhcp which is not checked to reconnect and the ADSL one which is checked. Look in the configuration files: "/etc/NetworkManager/system-connections/*" for "autoconnect=true"