|Reference : Revealing MPLS Tunnels Obscured from Traceroute|
|Scientific journals : Article|
|Engineering, computing & technology : Computer science|
|Revealing MPLS Tunnels Obscured from Traceroute|
|Donnet, Benoît [Université de Liège - ULg > Dép. d'électric., électron. et informat. (Inst.Montefiore) > Algorithmique des grands systèmes >]|
|Luckie, Matthew [ > > ]|
|Mérindol, Pascal [ > > ]|
|Pansiot, Jean-Jacques [ > > ]|
|Computer Communication Review|
|ACM Special Interest Group on Data Communication|
|[en] taxonomy ; traceroute ; MPLS ; toplogy|
|[en] Operators have deployed Multiprotocol Label Switching (MPLS) in the Internet for over a decade. However, its impact on Internet topology measurements is not well known, and it is possible for some MPLS configurations to lead to false router-level links in maps derived from traceroute data.
In this paper, we introduce a measurement-based classification of MPLS tunnels, identifying tunnels where IP hops are revealed but not explicitly tagged as label switching routers, as well as tunnels that obscure the underlying path.
Using a large-scale dataset we collected, we show that paths frequently cross MPLS tunnels in today's Internet: in our data, at least 30% of the paths we tested traverse an MPLS tunnel. We also propose and evaluate several methods to reveal MPLS tunnels that are not explicitly flagged as such: we discover that their fraction is significant (up to half the explicit tunnel quantity) but most of them do not obscure IP-level topology discovery.
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