[ubuntu] No/or extremely slow internet when Macs connect to the local network.

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http://ubuntuforums.org – Dear all, For like a year now, we have been experiencing a very awkward problem with the internet connection on all our Ubuntu machines (varying hardware). Our local network is connected with a D-Link DSR-500 to our workplace WAN and our machines connect to the local network through Netgear GS108 gigabit switches (all wired). The Ubuntu releases our machines run on range from 10.04 to 12.04(dev). A few minutes after we hook MacBook Pros on the network ALL the Ubuntu machines, although they can access the local network (through samba and ssh), they cannot access the internet (or they a (Hardware)