I-D Action: draft-bhargav-l3vpn-inter-provider-optcsec-02.txt

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	Title           : Preventing spoofing attacks in BGP-MPLS-VPN Inter-Provider Model-C
	Author(s)       : Bhargav Bhikkaji
                          Balaji Venkat Venkataswami
	Filename        : draft-bhargav-l3vpn-inter-provider-optcsec-02.txt
	Pages           : 15
	Date            : 2012-03-01

   In certain models of inter-provider Multi-Protocol-Label-Switching
   based Virtual Private Networks (MPLS-VPNs), spoofing attacks against
   VPN sites is a key concern. Unidirectional attacks towards VPN sites
   can compromise servers at the VPN sites and cause Denial-of-Service
   (DoS) situations. Currently, the inner labels associated with VPN
   sites are not encrypted during transmission. The Provider Edge (PE)
   router at the end to which the VPN customer is attached accepts any
   data packet with a valid label. This enables a man-in-the-middle
   attacker to spoof a packet to a specific site of a VPN. In this
   paper, we propose some secure techniques which provide security
   against such label-spoofing. These techniques ensure that an attacker
   would not be able to spoof labeled data packets. In order to make the
   proposed scheme robust, some additional steps are proposed over and
   above the initial steps specified. This makes the attacker to spend
   non-linear time to guess the right label for his unidirectional
   attacks to succeed. Our proposed technique can be applied to a
   specific type of inter-provider Border Gateway Protocol(BGP) based
   MPLS VPN and other existing variant where Multi-Protocol exterior-
   BGP (MP-eBGP) multi-hop is used. In future, if any other variant is
   proposed to use MP-eBGP multi-hop, our scheme can be used to protect
   against spoofing attacks.





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