I�ve been trying to find a way to prevent the auto router from placing vias in certain regions but still allow it to run tracks through that same region. Placing a rectangle on the keep-out layer works but the router won�t run tracks through it either. In the DRC �Routing Layers� you can define a region and then for that region allow only one layer. This will prevent a via being placed there in an attempt to get to the other side, even if you loose real-estate on one side, but the router doesn�t follow any �Routing layer� rules that define a region. I�m using Protel 99SE SP6 Any feed back would be greatly appreciated Cheers Alfonso Baz
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