In 11.04 problem still here. I solved this problem as follows:
sudo nano /etc/NetworkManager/system-connections/DSL (name of my connection)
go to section [ppp] and see what mtu = 1492. After changing of this value all good.
P.S Changing of MTU in GUI affect mtu record in section [802-3-ethernet], and this record has no effect for me.
In 11.04 problem still here. I solved this problem as follows:
sudo nano /etc/NetworkMan ager/system- connections/ DSL (name of my connection)
go to section [ppp] and see what mtu = 1492. After changing of this value all good.
P.S Changing of MTU in GUI affect mtu record in section [802-3-ethernet], and this record has no effect for me.