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Hic sunt NATs: Uncovering address translation with a smart traceroute

机译：Hic sunt NAT：使用智能跟踪路由发现地址转换

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摘要

Middleboxes are pervasive in today's Internet as they are deployed for an increasing number of reasons. An example is the network address translation (NAT), one of the first task to be performed to cope with the lack of IPv4 addresses. Recently the landscape for NATs has become even more crowded, especially in mobile networks, mainly due to the impossibility of IPv6 to be a large-scale solution to addressing issues. In this paper, we present a novel methodology for detecting NATs embodied in Mobile Tracebox, a measurement tool for Android smart devices that detects a wide range of middle-boxes. It analyzes ICMP time-exceeded messages received during traceroute and points at IP and transport checksum inconsistencies in the embedded packets to uncover address translation along a path. We deployed Mobile Tracebox through a crowdsourcing approach and used the collected dataset to validate our methodology. Results showed that, in absence of middleboxes breaking traceroute, it can help to detect and locate NATs in the majority of the cases.
机译：中间盒由于越来越多的原因而在当今的Internet中普及。一个示例是网络地址转换（NAT），这是应对IPv4地址不足而要执行的第一个任务之一。最近，尤其是在移动网络中，NAT的领域变得更加拥挤，这主要是由于IPv6不可能成为解决问题的大规模解决方案。在本文中，我们提出了一种新颖的方法，用于检测Mobile Tracebox中包含的NAT，Mobile Tracebox是一种Android智能设备的测量工具，可检测各种中间盒。它分析在跟踪路由期间收到的ICMP超时消息，并指向嵌入式数据包中的IP和传输校验和不一致，以发现沿路径的地址转换。我们通过众包方法部署了Mobile Tracebox，并使用收集的数据集来验证我们的方法。结果表明，在没有中间盒破坏跟踪路由的情况下，它可以在大多数情况下帮助检测和定位NAT。

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