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https://nikitushkinandrey.wordpress.com/2011/03/10/ttl-%d0%bb%d0%be%d0%b2%d0%b8%d0%bc-%d0%bd%d0%b0%d1%80%d1%83%d1%88%d0%b8%d1%82%d0%b5%d0%bb%d0%b5%d0%b9-%d0%bf%d0%b5%d1%80%d0%b8%d0%bc%d0%b5%d1%82%d1%80%d0%b0-%d1%81%d0%b5%d1%82%d0%b8-%d0%b8/
TTL – ловим нарушителей периметра сети или развенчиваем мифы