Discouraging the barn swallows

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When our house was being built, a pair of barn swallows built a nest in the incomplete garage, in the uppermost rafters. Consequently, they or their progeny have been returning every year to try to nest. This week, I had to evict them from a nest they'd started on our front porch. They moved to the back porch, at which point I bought some plastic webbing and have tried to prevent them from making nests there. The problem is that once they have eggs or hatchlings in the nest, they become very aggressive and will attack at high speed anyone who ventures onto the porch near the nest. Sorry guys, but it's our house not yours!