I have a problem with the 82574L network adapter. I use the webinterface of a Dreambox but this doesen't work correctly. If I call the site sometimes I get the message that the site is not availible or got no content. If I go in the command line before and do a ping to that IP the webinterface work also.
I tried the webinterface on two other PCs and the other PCs work normally. So I think maybe there is an option worong in the network adapter settings.