VPN construction method for multiple firewall environment

Kayashima, Makoto; Terada, Masato; Fujiyama, Tatsuya; Koizumi, Masatoshi; Katou, Eri

doi:10.1002/1520-684x(200012)31:14<57::aid-scj7>3.0.co;2-m

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…There exist some VPN link configuraclassified into two categories, namely ones that establish tion methods proposed so far that can traverse more a VPN link between two hosts, and ones between a host than one VGWs, such as proxy cascading method on and a network. Since the latter does not require to install SOCKS5 [1], PPP/PPTP relay method [2], extension [3] of VPN software onto servers in organizational networks SOCKS V5 protocol [4], proxy server method [5], virtual whereas the formers need to install VPN software onto path method [6] [7], and so on (hereafter, referring to all both application clients and servers, we focus on the of them as existing methods). Although these existing latter type of VPNs in this paper.…”

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confidence: 99%

An Efficient Management Method of Access Policies for Hierarchical Virtual Private Networks

Okayama

Yamai

Ishibashi

et al. 2007

2007 2nd International Conference on Communication Systems Software and Middleware

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VPN (Virtual Private Network) is one of the link (VPN link hereafter) between two points in the Intermost important technologies on the Internet. With VPN, net. However, today's VPN technologies mainly focus on we can securely access to resources in the organizational making secure connection between inside and outside of network via the Internet. In VPNs having hierarchical a organization, along with introducing a firewall to filter structure, since each VPN domain has different access pol-out malicious access into the organization. Therefore, icy (whether VPN gateway should perform authentication, * \ ] * * r l~~~~~n this paper we assume that a domain with an access data encryption, and so on or not), an administrator of a p P VPN domain may need to configure access policies which policy (a VPN domain hereafter) has a firewall at the are different from every VPN sub-domain. However, in the border of the organization (hereafter a VGW, standing for existing VPN methods, since access policies are stored in VPN gateway). An access policy defines how to control a static configuration file of each VPN gateway, an admin-network access into the organization based on many istrator of a VPN domain has to cooperate with the other kinds of information, including whether authentication administrators of its sub-domains. Therefore, management and encryption are necessary or not, what encryption cost of access policies becomes considerably large if the algorithms are allowed, which hosts are allowed to organization has large and complicated structure. In this paper, we propose an efficient management a method of access policies for hierarchical VPNs. In order In large scale organizations, there may be many dito reduce management cost, we introduce a database with visions each of which has a different access policy. hierarchical structure to represent access policies easily In such organizations, VPN domains are configured and policy servers to get access policies automatically. hierarchically, just like DNS domains. In this paper, weThe effectiveness of our proposed method is confirmed by discuss VPNs to access into an lower VPN domain from an experiment on an actual network using policy servers the outside of the organization through two or more based on the proposed method.VGWs, and refer to this type of VPNs as hierarchical VPNs. I. INTRODUCTION In order to access into the lowermost VPN domain VPN (Virtual Private Network) receives much atten-from a client at the outside of the organization using a tion as a technology for secure access by users to their hierarchical VPN, the client has to traverse all VGWs organizational network via the Internet. There are many from the uppermost one toward the lowermost one, VPN technologies proposed so far, and they are roughly hop by hop. There exist some VPN link configuraclassified into two categories, namely ones that establish tion methods proposed so far that can traverse more a VPN link between two hosts, and ones between a host than one VGWs, such as proxy cascading method o...

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mentioning

confidence: 99%

An Efficient Management Method of Access Policies for Hierarchical Virtual Private Networks

Okayama

Yamai

Ishibashi

et al. 2007

2007 2nd International Conference on Communication Systems Software and Middleware

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Influence of Force Tremor on Mechanomyographic Signals Recorded with an Accelerometer and a Condenser Microphone during Measurement of Agonist and Antagonist Muscles in Voluntary Submaximal Isometric Contractions

Kim

Shimomura

Iwanaga

et al. 2008

J Physiol Anthropol

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The purpose of this study was to investigate the influence of force tremor (FT) on the mechanomyogram (MMG) recorded by a condenser microphone (MIC) and an accelerometer (ACC) for the measurement of agonist and antagonist muscles during submaximal isometric contractions. Following determination of the isometric maximum voluntary contraction (MVC), 10 male subjects were asked to perform elbow flexion and extension at 20%, 40%, 60%, and 80% MVC. Surface electromyogram (EMG) and MMG of the biceps brachii (BB) and triceps brachii (TB) were recorded simultaneously using a MIC (MMG-MIC ) and an ACC (MMG-ACC ). We analyzed the root mean square (RMS) for all signals and compared the sum of the power spectrum amplitude (SPA) at 3-6 Hz and 8-12 Hz between the MMG-MIC and the MMG-ACC . During elbow flexion and extension, the RMS of the EMG and the MMG-MIC of the agonist were significantly (pϽ0.05) higher than those of the antagonist in each contraction level. The RMS of the MMG-ACC of the antagonist showed no significant (pϾ0.05) difference from that of the agonist, or tended to be higher than the agonist. The SPA of the MMG-MIC of the agonist at 3-6 Hz and 8-12 Hz tended to be higher than the antagonist in elbow flexion and extension at each contraction level. The SPA of the MMG-ACC of the agonist and that of the antagonist showed no significant ( pϾ0.05) difference, or the antagonist MMG-ACC tended to be higher than that of the agonist. These results suggest the MMG detected by a MIC appears to be less affected by FT than is the ACC because of its inherent characteristic to reduce FT in simultaneously evaluated agonist and antagonist muscles by means of MMG during submaximal isometric contraction.

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VPN construction method for multiple firewall environment

Cited by 2 publications

References 4 publications

An Efficient Management Method of Access Policies for Hierarchical Virtual Private Networks

An Efficient Management Method of Access Policies for Hierarchical Virtual Private Networks

Influence of Force Tremor on Mechanomyographic Signals Recorded with an Accelerometer and a Condenser Microphone during Measurement of Agonist and Antagonist Muscles in Voluntary Submaximal Isometric Contractions

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