A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Securing Model-C Inter-Provider L2 VPNs with Label Hopping and TicToc
Author(s) : Shankar Raman
Balaji Venkat Venkataswami
Gaurav Raina
Bhargav Bhikkaji
Filename : draft-mjsraman-l2vpn-vpls-tictoc-label-hop-03.txt
Pages : 19
Date : 2013-04-08
Abstract:
In certain models of inter-provider Multi- Protocol Label Switching
(MPLS) based Virtual Private Networks (VPNs) spoofing attack against
VPN sites is a key concern. For example, MPLS-based VPN inter-
provider model "C" for VPLS, or any L2 VPN purpose is not favoured,
owing to security concerns in the dataplane, even though it can scale
with respect to maintenance of routing state. Since the inner labels
associated with VPN sites are not encrypted during transmission, a
man-in-the-middle attacker can spoof packets to a specific L2 VPN
site. In this paper, we propose a label-hopping technique which uses
a set of randomized labels and a method for hopping amongst these
labels using the time instant the packet leaves the port from a
sending Provider Edge Router. To prevent the attacker from
identifying the labels in polynomial time, we also use an additional
label. The proposed technique can be applied to other variants of
inter-provider MPLS based VPNs where Multi-Protocol exterior-BGP (MP-
eBGP) multi-hop is used. As we address a key security concern, we can
make a case for the deployment of MPLS based L2 VPN inter-provider
model "C". Specifically we use the TicToc based Precision Time
Protocol LSP to provide the timing for determining the time instant
at which the packet is sent from the remote end Provider Edge Router
and hence calculating when it must have left that peer at the
Provider Edge Router in the near / receiving end.
This version of the document suggests a better method for gaining
more finely granular time slices. This is done by running the PTP LSP
between the ASBRs in the ASes that are providing the inter-AS L2VPN
service.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-mjsraman-l2vpn-vpls-tictoc-label-hop
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-mjsraman-l2vpn-vpls-tictoc-label-hop-03
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-mjsraman-l2vpn-vpls-tictoc-label-hop-03
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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